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Scottish Hydro Electric Power Distribution (SHEPD) Marine & Freshwater Subsea Inspections – 2022



Please be advised that Aspect Land & Hydrographic Surveys Ltd (on behalf of SHEPD) will be undertaking subsea and freshwater inspections of several cables within a defined corridor.


Please be advised that Aspect Land & Hydrographic Surveys Ltd (on behalf of SHEPD) will be undertaking subsea and freshwater inspections of several cables within a defined corridor.

 

Given the different conditions and water depths anticipated at each site, a range of vessels will be utilized across the project. The inspection works will be centered on a 50m cable corridor.

 

Survey operations at these locations are expected to commence in June 2022, with start dates and anticipated durations given in the attached NtM.

 

VESSEL DETAILS

All vessels to be used during the survey and inspection campaign are owned and operated by Aspect Land & Hydrographic Surveys Ltd. Operations will be limited to daylight hours only.

The vessels conducting these inspections will be restricted in their its ability to manoeuvre and will display the appropriate lights and shapes. Other vessels are requested to pass at a safe speed and provide a minimum clearance of 500m (COLREGs Rule 16 & 18) during marine operations.

All vessels will monitor VHF Channel 16 throughout survey operations. Mobile contacts for the vessels are listed at the end of the attached NtM.

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Notice to Mariners SHEPD ED1 Subsea Cable Installations



Please be advised that Briggs Marine Contractors (on behalf of SHEPD) shall be undertaking the following subsea cable installations: • Mull to Coll – Works commence from 5th September 2022 • Carradale to Arran – Works commence from 11th September 2022


Please be advised that Briggs Marine Contractors (on behalf of SHEPD) shall be undertaking the following subsea cable installations:

  • Mull to Coll – Works commence from 5th September 2022
  • Carradale to Arran – Works commence from 11th September 2022

 

Vessel Operations

The work utilises cable ship Elektron for boulder clearance, pUXO investigations and ROV operations along both routes. Kingdom of Fife will then carry out pre-lay grapnel runs, ahead of cable lay operations, along the specified routes. Elektron will return to site after completion of PLGR to execute the cable installations.

 

Landing craft Carly and Celtic Trader will be landing equipment at the shore ends of the cable routes with the exception of Carradale.

 

DSV Forth Drummer will be conducting diving operations within the cable corridor.

 

Elektron will be assisted at the shore ends by Celtic Guardian, Celtic Mara, Celtic Nomad and Celtic Voyager, regularly passing inside the working corridor for crew transfers and supporting nearshore cable landing operations.

 

Post lay surveys of the nearshore areas (<10m LAT) will be conducted in the period following installation but prior to cable burial. This will be conducted during daylight hours using a small unmanned survey vessel (USV) or RIB <10m long. This operation should take <1 day per landfall.

 

Cable lay activities are expected to continue over a period of 30 days, weather permitting.

 

As built surveys and burial by ROV jet trenching will follow on but will be covered by a separate NTM closer to the date of execution.

 

Work Description

During operations the vessels Elektron, Kingdom of Fife and Forth Drummer will be restricted in ability to manoeuvre. Whilst operations will seek to minimise disruption on the width of the main navigation channel, some disruption may be unavoidable during operations within the working corridor.  

 

Cable laying, boulder clearance, pUXO investigations and ROV operations may be conducted on a 24-hour basis.

 

Should any vessel wish to come within 500m of the vessels, then direct communication with the Master / Operator is required.

 

The vessels will display the appropriate lights / day shapes for their operations.

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Offshore UXO - Moray West Site Investigations



This notice to mariners is to inform that Moray Offshore Windfarm (West) Limited (Moray West) have been carrying out UXO survey investigations from a vessel at the Moray West Offshore Wind Farm site and Export Cable Corridor.


This notice to mariners is to inform that Moray Offshore Windfarm (West) Limited (Moray West) have been carrying out UXO survey investigationsfrom a vessel at the Moray West Offshore Wind Farm site and Export Cable Corrior. The Moray West site is located on the Smith Bank in the Outer Moray Firth, approximately 22.5km from the Caithness coastline. The offshore wind farm site covers an area of approximately 225km2.

 

 As part of these works, some equipment has been placed on the seabed that will be left unattended this week before it is recovered. Recovery date is expected to be before 22/08/2022. Three metal cylinders c/w recovery lines have been deployed to the seabed as part of the on going survey works. These are intended to be recovered as soon as practicable. Recovery date is expected to be before 22/08/2022.

 

Site investigation operations are being carried out by the survey vessel Ocean Researcher. Ocean Researcher will be towing geophysical equipment which may be up to 300 m behind the vessel. It is requested that all vessels operating within the area keep a safe distance (at least 500m) and pass at minimum speed to reduce vessel wash.

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Geotechnical Survey - Berwick Bank Windfarm



SSE Renewables will be undertaking a geotechnical survey within the Berwick Bank Wind Farm and export cable route area. The survey is planned to mobilise between 15 -20 June 2022 for a duration of up to 2 months dependent on weather and downtime. Please note that SSE Renewables are not expecting fishermen to relocate gear - on this occasion the vessel(s) will work around any gear on location. A scouting/guard vessel will operate ahead of the survey vessel to ensure that this can be achieved.


The survey work is being undertaken by GEO and will be conducted from the vessel Northern Ocean. The scouting/guard vessel will be the Artemis.

 

The scope of work within the main array area will comprise approximately 100 seabed CPTs to a maximum depth of 30 m below the seafloor (bsf) and approximately 100 co-located vibrocores to a maximum depth of 6 m bsf. The scope of work along the export cable route will comprise approximately 80 seabed CPTs and 80 co-located vibrocores to a maximum depth of 6 m bsf.

 

During the survey campaign, the vessel(s) will be deploying underwater equipment to gather cores and also assess the geology in the area. As a consequence of equipment being deployed and the modes of operation, all mariners are advised to keep a safe clearance distance of no less than 500 m from the vessel(s).

 

For vessel and contact information, please see the attached Notice to Mariners document provided with this notice. 

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Dogger Bank A,B&C UXO Inspection Campaign. Confirmed UXO Locations



UXO Inspection Operations within Dogger Bank A and Dogger Bank B Array construction areas have identified the presence of several confirmed UXO items.


These items will be addressed during a separate UXO Clearance phase of work estimated to be performed around October / November 2022. Until this subsequent campaign is performed it is requested that any vessel activities involving interaction with the seabed are kept to a minimum distance of 500m from the UXO items listed herein.   

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Dogger Bank A Export Cable Lay Operations Rock Placement



The rock placement vessel, Flintstone, will perform rock placement on the Dogger Bank A export cable route in the Southern North Sea.


Rock will be placed as remedial work on the  SEAL pipeline crossing (KP146 approx.). In/out surveys will be performed prior to and following rock placement at this position.

 

It is requested that all vessels maintain a minimum of 1.5Nm separation distance from the Flintstone and pass at reduced speed. Fishing gear or other equipment with seabed intervention should not be deployed when approaching the working corridor.

 

 

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Offshore Construction - Dogger Bank A Offshore Wind Farm



Offshore Construction of the Dogger Bank A Offshore Wind Farm commenced on the 18th of March 2022. The development of the windfarm is made up of several elements - current ongoing elements  are described below in the 'full notice' and in the attached file. This notice will be updated weekly, giving information on the progress and resources involved in the offshore project.


The development of the windfarm is made up of several elements - current ongoing elements include:

 

Foundation Installation       

The Offshore installation vessel, Innovation, will install monopile foundations, within the Dogger Bank A construction area.

 

The works commenced on the 25th of July 2022, continuing until approximately Q3 2023 The works will be continuous 24 hours a day. Charts of the DBA construction area and foundation locations are provided in the attached WNoO. A running list of the next locations to be installed and completed foundation locations will be presented in the Weekly Notice of Operations.

 

Export Cable Burial

To complete the cable protection, the rock placement vessel, Flintstone, will perform rock placement on the Dogger Bank A export cable route in the Southern North Sea. In the final part of the workscope, rock will be placed on the SEAL pipeline crossing (KP146 approx.). In/out surveys will be performed prior to and following rock placement at each position. 

 

Export Cable Guard Vessels

A Guard vessel is deployed at the SEAL pipeline crossing (KP146 approx.).

 

For further details of current offshore construction activities, please contact the people below or see attached Weekly Notice of Operations.

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Dogger Bank South Site Investigations



Fugro will be undertaking geophysical, geotechnical and environmental site investigations on behalf of RWE Renewables within the proposed Dogger Bank South (DBS) Offshore Wind Farms array site and export cable routes.


Geophysical Surveys

Geophysical survey operations on the Dogger Bank South array site continues with the Fugro Searcher until approximately the 10th September 2022 and the Fugro Frontier until approximately the 31st October 2022.

 

As the Fugro Frontier and Fugro Searcher will be towing survey equipment, vessels will require large turning circles and will be restricted in their ability to manoeuvre. All vessels operating within the array area are requested to keep their distance, maintaining at least the 1,000m safety zone around the survey vessel, and pass at minimum speed to reduce vessel wash.

 

Geotechnical Surveys

Geotechnical survey operations on the Dogger Bank South array sites continues with the Fugro Scout until approximately the 24th August 2022.  As the Fugro Scout will be conducting drilling operations using a dynamic positioning system, it is requested that all vessels operating within this area keep their distance, maintaining at least a 500m exclusion zone, and pass at minimum speed to reduce vessel wash.

 

Environmental Surveys

Environmental survey operations the Dogger Bank South array continues with the DSV Curtis Marshall until approximately the 30th August.

 

The DSV Curtis Marshall will be acquiring seabed samples during which manoeuvrability will be limited.  The Curtis Marshall will also be conducting research seabed trawling with towed equipment (2-m beam trawl) and seabed imagery with a towed camera.  All vessels operating within the vicinity of the DSV Curtis Marshall are requested to keep their distance, maintaining at least a 500m safety zone around the survey vessel, and pass at minimum speed to reduce vessel wash.

 

Please note that the exact start and finish dates for all survey vessels will be dependent on the prevailing weather conditions and work progress.

 

A continuous listening watch will be conducted on VHF Channel 16 by all survey vessels.

 

Survey operations will be conducted on a 24-hour basis.

 

Vessel Name Vessel Type Call Sign MMSI Number IMO
Fugro Frontier Array Geophysical Survey Vessel C6BH4 311000263 9723667
Fugro Searcher Array Geophysical Survey Vessel C6EI5 311000904 9504011
Fugro Scout Array Geotechnical Survey Vessel 9V3887 566948000 9600372
DSV Curtis Marshall Benthic Survey Vessel 2HWN3 235107219 n/a

 

All survey operations along the Dogger Bank South export cable routes are now complete.

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Construction of Wind Farm - Triton Knoll



Activities related to the development of the Triton Knoll wind farm continue, as detailed below. For background information visit: http://www.tritonknoll.co.uk. Mariners are advised that the asset installation phase of the Triton Knoll OWF is now complete. Post-installation commissioning and repair activity is continuing and it is anticipated that construction vessels required for repair work will be returning to site occasionally in early 2022 and further notices will be issued accordingly.


Mariners are advised that the following vessel will be mobilising to the Triton Knoll Offshore Wind Farm (TKOWF) as outlined within previously issued NtM's:

Vessel Name

Type

Call Sign

MMSI

IMO

Operating Port

Commence Date

MPI Adventure Offshore support vessel PCKV 245924000 9530084 Grimsby 28/08/2022

 

Mariners are advised that the following vessels continue to be active at the Triton Knoll Offshore Wind Farm (TKOWF) as outlined within previously issued NtM's:

Vessel Name

Type

Call Sign

MMSI

IMO

Operating Port

Commence Date

Windcat 11 Crew Transfer Vessel 2BIS9 235066459 N/A Grimsby 14/12/2020
Esvagt Havelok Service Operations Vessel OYFR2 219026496 9878981 Grimsby 25/09/2021
Seacat Courageous Crew Transfer Vessel 2IDC9 235108711 9758052 Grimsby 01/05/2022
Cerys Line Utlility Vessel MGMR5 232025503 8228842 Grimsby 13/06/2022
Ginny Louise Passenger vessel 2FCV4 235090162 - Grimsby 29/07/2022
Astrea Offshore Tug SYBE 240691000 8520771 Grimsby 12/08/2022

 

All vessels can be contacted via VHF channel 16 when operational in field.

 

Note

Mariners are advised that there will be Blade Inspection works commencing from 14/07/2022 at Triton Knoll Offshore Wind Farm which will be carried out by Rope access Teams. During these works, the 50m exclusion zone must be strictly adhered to when these works are ongoing on the Wind Turbines. The TK Control Room will alert all vessels periodically via VHF Channel 16 when the Rope Access team are working on a Wind Turbine and remind all of the requirements to maintain the 50m exclusion zone.

 

Activities carried out over the previous 7 Days:

  • Ongoing activities at Offshore Sub Station Platforms East & West continues.
  • Ongoing activities at Offshore foundations continues.
  • Wind Turbine Generator Service and maintenance continues infield

Activities planned for the next 7 days:

  • Ongoing activities at Offshore Sub Station Platforms East & West continues.
  • Ongoing activities at Offshore foundations continues.
  • Wind Turbine Generator Service and maintenance continues infield.
  • Onging Subsea Surveys undertaken by the Cerys Line.

*** Note ***

 

All 90 WTG's have now been fully installed, whilst WTG commissioning and service continues.

All Export Cables are fully installed/buried and need to be deemed live/energised.

All Inter Array Cables are fully installed and buried and need to be deemed live/energised.

Whilst the main installation works have been completed, major construction commissioning works are continuing.

 

*** Note ***

 

Whilst TKOWFL is reopening the site to fishing from the 14th December 2021, TKOWFL kindly request that all fishermen intending to fish within the boundaries of the Triton Knoll wind farm, contact the Triton Knoll control room prior to entering and exiting the field, and inform them of their fishing intentions.

 

This precaution is requested to safeguard all vessels operational at the TKOWF site (including fishing vessels) and your cooperation, to ensure the safety of all parties is appreciated. The following contact details should be used when notifying the Triton Knoll control room of fishing activity:

 

Control Room Manager: Derek Whyte

Radio: VHF channel 16

Callsign: TK MCC

Phone: +44 1793 896250

Email: tkcr@rwe.com

 

*** Note ***

 

Application of Triton Knoll Wind Farm Safety Zones During Construction

The Secretary of State has granted the Application of Safety Zones on the Triton Knoll Wind Farm Project as follows:

  • 500m “rolling” safety zones around any structure where construction is being undertaken (as indicated by the presence of construction vessels).
  • 50m pre-commissioning safety zones surrounding partial structures or completed structures prior to commissioning.

Mariners are advised that all foundations monopiles have been installed and all inter-array and export cables have been installed.

 

Local Notice to Mariners Recently

NtM 001-2022 (24th January 2022)

NtM 002-2022 (28th January 2022)

NtM 003-2022 (08th March 2022)

NtM 004-2022 (09th March 2022)

NtM 005-2022 (14th March 2022)

NtM 006-2022 (30th March 2022)

NtM 007-2022 (7th April 2022)

NtM 008-2022 (7th April 2022)

NtM 009-2022 (10th April 2022)

NtM 010-2022 (19th April 2022)

NtM 011-2022 (04th May 2022)

NtM 012-2022 (04th May 2022)

NtM 013-2022 (06th May 2022)

NtM 014-2022 (06th May 2022)

NtM 015-2022 (13th May 2022)

NtM 016-2022 (18th May 2022)

NtM 017-2022 (08th June 2022)

NtM 018-2022 (22nd June 2022)

NtM 019-2022 (30th June 2022)

NtM 020-2022 (11th July 2022)

NtM 021-2022 (11th July 2022)

NtM 022-2022 (03rd August 2022)

 

Navigation Warning - 08th January 2021

 

Mariners are advised that the remnants of a Wave Rider Buoy sinker weight and partial rigging are located within the Triton Knoll Offshore Wind Farm Construction site at the following location;

 

53° 30.442N 000° 50.564E

 

It is advised that the partial rigging could potentially be floating up to 9.7m above the seabed, reducing the navigable safe water in the immediate area to 10m LAT.  Mariners are advised to avoid the indicated position by 250 metres.

 

Possible Dangers to Navigation - Properties of the polypropylene show that the rope is buoyant, this makes the line sensitive for thruster currents. Taking the site water depth into consideration (19.7m LAT) and the maximum expected height above seabed of the rope 9.7m the line is expected to be floating submerged at approximately -10m LAT. In addition, it is noted that over time sediments will be trapped between the fibres and the heavier rope may finally sink. The polypropylene rope may impose a risk to foul propellers / propulsion of vessels due to the buoyant nature of the rope. As the rope is submerged at a depth of ~-10m LAT the risk is considered minimum for vessels with a shallow draught (<5m) and medium for a vessel with a deeper draught (>5m). Over time sediments will be trapped between the fibres and the heavier rope may finally sink thereby reducing the risk to propellers/propulsion of vessels. The clump weight itself (chain) is expected to have sunk into the seabed and has no significant height above seabed. In addition, the edges of the clump weight are mostly rounded (chain), the risk the clump weigh imposes to fishing activities/gear is therefore considered to be minimal.

 

Navigation Warning - 16th March 2021

 

Mariners are advised that two UXO targets have been confirmed within the Triton Knoll Offshore Wind Farm Array.

 

Mariners are advised that the two confirmed targets are located within 20 metres water depth (LAT) and a 10 metre radius exclusion zone is required around each target.  The following table provides the coordinates and a description for each target.

 

Description of Target Latitude Longitude

Water Depth

(LAT) Metres

Required Exclusion

Zone (Metres Radius)

Archaeological - The item is thought to be an air-delivered bomb.  It appears to be in a stable condition and is resting on the seabed.  Marine growth and concretion cover the body, indicating it has been in situ for a significant duration. The tail section of the bomb is missing, which is typical of unexploded bombs from WWII found in these circumstances and there is a significant hole in the case. The dimensions and characteristics gathered are consistent with a 500kg German bomb. Considering the state of the bomb the Net Explosive Quantity of the bomb is likely to be <5kg. 53°31'50.249"N 00°47'45.908"E 20 10
Archaeological - The item is thought to be an air-delivered bomb.  It appears to be in a stable condition and is resting on the seabed.  Marine growth and concretion cover the body, indicating it has been in situ for a significant duration. The tail section of the bomb is missing, which is typical of unexploded bombs from WWII found in these circumstances and there is a significant hole in the case. The dimensions and characteristics gathered are consistent with a 500kg German bomb. Considering the state of the bomb the Net Explosive Quantity of the bomb is likely to be <5kg. 53°31'49.895"N 00°47'45.115"E 20 10
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Cable Repair - Gwynt Y Mor Export Cable



Vessel change: The Forth Warrior has replaced the Forth Jouster. Please be advised of this notice advising mariners of the Gwynt Y Mor export cable repair. Work on site will be from 27/05/22 in the Gwynt Y Mor export cable corridor for approximately 55 days subject to weather. A barge, the NP459, will be assisted by two anchor handlers, Sea Bravo and Forth Warrior, to carry out a cable repair. Zwerver III and a crew transfer vessel, Mareel Scarlet, will support these operations.


Nature of Operations

Concrete mattresses will be installed on Rhyl Flats cable crossing by the NP459. A cable repair will follow, executed by the NP459. The NP459 will be operating on an eight anchor mooring plan during cable lay and recovery operations.

 

The Sea Bravo and Forth Warrior will be anchor handling in support of the NP459.

 

The Zwerver III will be carrying out de-burial/burial operations before installing post cable lay concrete mattresses at Rhyl Flats cable crossing. 

 

The Mareel Scarlet CTV will support operations.

 

The work will be carried out in the cable corridor route as shown in figure 1. We kindly ask that all vessels in the local vicinity observe at least 1000m stand off from the NP459 at all times and a 500m stand off from the other vessels involved in the work scope.

 

During the works, the vessels will display the lights and signals relevant to the operations and will be monitoring VHF Channels 16 and 12.

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Metocean Equipment Deployments at 3 sites on the E1 East floating offshore wind farm



Partrac Ltd. is scheduled to deploy an array of metocean equipment over a period of 24 months, on 3 sites at the E1 East floating offshore wind farm off the East coast of Scotland. Equipment to be deployed includes: Floating LiDAR buoy at sites 1 and 3, Guard buoy at site 2, Datawell Waverider buoy at all 3 sites, Subsea mooring at all 3 sites. Deployments will be carried out over three days from 13th August 2022. Operations will be completed by the vessel 'Panda'


Please Maintain a 500 m exclusion around each position.

 

FLOATING LIDAR BUOY The floating LiDAR buoy deployed at sites 1 and 3 records meteorological data and are anchored to the seabed by means of a mooring chain and a ground weight. The buoy has dimensions of 4m x 4m, and when deployed the tallest mast on the buoy sits approx. 4m above the water line. The lantern will have a flash sequence Fl (5) Y 20s. Please maintain a 500m exclusion around each buoy.

 

WAVEBUOY

The wavebuoy deployed at each site is a 1.1 m diameter yellow spherical buoy fitted with a flashing antenna with sequence Fl (5) Y 20s.

 

GUARD BUOY

The guard buoy deployed at site 2 comprises a yellow St Andrews Cross, radar reflector, and yellow navigation light. The light will have a flash sequence Fl (5) Y 20s.

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Mooring and scientific equipment installed – Beatrice, Moray East offshore windfarm sites



Mariners are advised that the University of Aberdeen has completed the installation of the moorings and equipment listed in the current notice. Moorings support sound recording equipment, and / or acoustic loggers that record echolocation clicks of dolphins and porpoises. Subsurface moorings extend no more than 3 m vertically from the seabed. The recording equipment and moorings will remain at these locations for 6-8 weeks and should be retrieved in September 2022.


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Mooring and scientific equipment installed - Moray West offshore windfarm



Mariners are advised that the University of Aberdeen has completed the installation of the moorings and equipment listed in the current notice. Moorings support sound recording equipment, and / or acoustic loggers that record echolocation clicks of dolphins and porpoises. Subsurface moorings extend no more than 3 m vertically from the seabed. The recording equipment and moorings will remain at these locations for 6-8 weeks and should be retrieved in September 2022.


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Carradale to Arran Power Cable Installation – Wet Storage and Installation of HDD Ducts



Please be advised that Global Offshore (on behalf of SHEPD) are conducting the installation of the replacement Carradale-Arran submarine electricity cable. As part of the cable replacement project, one-off Horizontal Directional Drilling (HDD) operations will be carried out, with the aim to install a 400mm SDR11 HDPE duct that will allow the Carradale-Arran cable to reach the onshore connection point.


Overview Please be advised that Global Offshore (on behalf of SHEPD) are conducting the installation of the replacement Carradale-Arran submarine electricity cable.

As part of the cable replacement project, one-off Horizontal Directional Drilling (HDD) operations will be carried out, with the aim to install a 400mm SDR11 HDPE duct that will allow the Carradale-Arran cable to reach the onshore connection point.

The purpose of this notice is to outline the area for the HDD duct installation works including temporary storage of one duct length of approximately 420m.

Nearshore Support Operations Location: Nearshore north of Port Crannaich

Dates of operations: 27th June 2022 - 31st August 2022

 

Works will take place in the nearshore area north of Port Crannaich. The 420m floating pipe will be pulled using the Oscar to the given storage location within the area indicated below. The pipe will then be pulled into the offshore HDD assisted by all the three vessels that are being operated for this this work.

Leask Marine moorings will be onsite for the stated duration. Leask Marine’s Hornet will also be on site working as a line and support boat.

 

Details of lights, buoys and other navigational aids Mooring buoys at each end of the 420m floating pipe are marked with colour yellow - flash yellow light – 1 FY5s – Light range 1nm

Marker lights (4 white and 4 orange strobe) are also distributed throughout the length of the pipe and are on continuous flash.

Proposed routes of vessels involved in installation (from port to site) Main Vessel Route Port Crannaich to Site and site to Port Crannaich. Campbeltown harbor authorities will be notified of all operations and movements

 

Details of any areas to be avoided Vessels are requested to maintain a minimum distance of 250 meters from the working area enclosed within the stated co-ordinates.

Instructions to vessels Vessels involved will be keeping continuous listening watch on Channel 16 and 6 and will display appropriate lights and marks as required by the International Regulations for Preventing Collisions at Sea (COLREGs). Mariners are requested to give the works a wide berth.

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UXO geophysical surveys within the EA HUB Offshore Wind Farm area



Scottish Power Renewables UXO geophysical surveys within the EA HUB OWF area. Scottish Power Renewables (SPR) has contracted Fugro GM Marine Limited (Fugro) to carry out UXO surveys located on their site east of Lowestoft, United Kingdom, in the southern North Sea and covers an area of approximately 5,900 km2 for the East Anglia HUB offshore windfarm.


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Gwynt y Mor Exposed Power Cable



Exposed power cable at Gwynt y Mor. Wide berth requested.


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Geophysical Survey - Triton Knoll



A-2-Sea Solutions will be carrying out a geophysical and environmental survey of the Triton Knoll infrastructure including WTG's, array cables and export cables.


Geophysical survey operations involving hull mounted multibeam echosounder and towed side scan sonar (SSS) of the Triton Knoll wind farm assets will commence in mid-June from the vessel Cerys Line (27m LOA).

 

The SSS will be towed up to 150m astern. A wide berth is requested at all times as the vessel will be restricted in her manoeuvrability. 

 

Environmental survey operations will commence in early-mid July, following completion of the geophysical survey.

 

Drop down video and sediment grab samplers will be deployed from the stern of the vessel, restricting manoeuvrability.

 

Cerys Line will exhibit lights and shapes prescribed by the International Regulations for Preventing Collisions at Sea and will maintain a listening watch on VHF Channel 16.

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Diver Works Noss Head - Shetland HVDC HDD



Scottish Hydro Electric Transmission Plc, as part of the Shetland HVDC Link Project will be undertaking diving operations at Noss Head. The works will commence on the 8th of June and are located approximately 400m offshore in around 19m of water.


 Scottish Hydro Electric Transmission Plc, will be undertaking diving operations at Noss Head to assist with cable pull-in for the Shetland HVDC Link. The works are located approximately 400m offshore in around 19m of water.

 

The Shetland HVDC link is a critical electricity transmission link and will form part of the electrical transmission grid that is essential to the transport of renewable energy between the locations where it is generated and areas of demand, and the delivery of both Scotland’s and the United Kingdom’s 2030 climate change targets.

 

Three Horizontal Directional Drilled (HDD) ducts were installed at the site in 2021. These ducts are currently protruding from the seabed. Diving operations are planned to be undertaken at the protruding duct locations between the 8th June 2022 and 6th of  August 2022 to assist with cable pull-in. A wider area, referred to as the ‘Mooring Area’, is the area in which the diving and cable pull-in operations will take place.   

 

Vessels are required to maintain a safe distance from the ‘Mooring Area’ until the estimated completion date of 14th Sept 2022.

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Pre-Construction Survey Greenlink Interconnector



Pre-Construction Geophysical Survey of the Greenlink Interconnector Route. The survey works will be conducted by the Geo Ocean V (call sign 5BWE3/MMSI 253754000): a multi-disciplined Offshore Survey Vessel with hybrid propulsion fitted for Geophysical and Geotechnical survey work. The vessel will have stern deployed equipment and will be restricted in manoeuvrability.


All vessels operating within this area are requested to keep a 500m distance and pass at minimum speed to reduce vessel wash. The vessel will always be listening to channel 16 but can set any other channel as required.

 

Throughout operations, the vessel will be displaying the appropriate lights and shapes as required under the COLREGS Rule 27(b)  

 

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Wave Data Buoy Installation



A wave data buoy has been installed to assist foundation activity within the Seagreen Offshore Windfarm site. The wave data buoy will display the following characteristics - Fl(5)Y 20s 4M


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Nearshore Geophysical and Benthic Survey 2022



This survey shall take place from 17/08/2022 to 11/09/2022, Spectrum Nyquist to start on 17th of August and Spectrum 1 to start on the 9th of September.


Contact details onshore FLO: +44 (0) 7926418820, email: OWPLFisheries@xodusgroup.com and offshore
Spectrum Nyquist: +44 (0) 7803031728 or +44 (0) 7367033380
Spectrum 1: +44 (0) 7538 565561

 

Name of vessel carrying out the work and towed equipment used: MV Spectrum1 (Geophysical and benthic
and Spectrum NyQuist (geophysical)

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Benthic Environment Survey - West of Orkney Wind Farm



The survey shall take place from 17th of August to the 26th of September.


Contact details: +44 (0) 7926418820, OWPLFisheries@xodusgroup.com; offshore +31 62 52 61 499
Name of vessel carrying out the work and towed equipment used:  MV Geo-Ranger  
Port of operation: Scrabster.

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Subsea Foundation Inspection - Moray Offshore Windfarm (East)



Please be advised that Moray Offshore Windfarm (East) Limited (Moray East) are planning to commence subsea Remotely Operated Vehicle (ROV) foundation inspections at all locations within the bounds of Moray East Offshore Windfarm on the 1st April 2022 for 100 days. This includes scour visual inspections at all jackets, and Cable Protection Systems entering substructures at selected locations. The area of Operation is shown in Figure 1 below and will be carried out using the GXS Viking.


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Seagreen Offshore Windfarm - Export Cable Installation



Export cable installation activities have commenced between the Carnoustie export cable landfall site and the Seagreen Offshore Substation Platform. Three export cables will be pulled into the landfall site at Carnoustie and surface laid to the Seagreen offshore site where they will be pulled into the platform. The three cables will also be trenched to a pre-determined depth.


On behalf of Seagreen Wind Energy Ltd, Nexans AS have commenced the installation of the first of three Seagreen export cables. Export cable number 1 has been pulled into the landfall site at Carnoustie and surface laid to the vicinity of the Seagreen Offshore Substation Platform. Prior to pull in operations at the offshore platform the cable has been wet stowed on the seabed in the vicinity of the platform. The wet stow arrangement for the cable is shown below in Fig 2, the cable end coordinates are shown below in table 2. Cable protection trenching operations have commenced at the Carnoustie landfall site. A Capjet trenching tool will be utilised to bury the export cable to a pre-determined depth. This operation is expected to be completed within 2-3 weeks. The deployment of the Capjet trenching tool can be seen below in Fig 3. There shall be five vessels utilised during this operation. Nexans Aurora will now conduct cable protection trenching operations between the landfall site and sub-station platform. During pull-in operations at the sub-station platform the MMS Supreme crew transfer vessel will deploy teams to the platform. Three guard vessels will be deployed to guard the surface laid cable. Details of when the cable will be pulled into the Offshore Platform will be promulgated in an update to this notice.

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Survey - West of Orkney Wind Farm



This geophysical survey shall take place from 2 April 2022 to 31 August 2022 and will occur in three phases: 1) Course survey lines over the offshore option agreement area and single survey lines along potential cable routes to Caithness; 2) Detailed survey in the offshore option agreement area. This phase is divided into three sub-sections and; 3) Detailed survey of potential cable corridors to Caithness. The Relume will carry out the work and the port of operation is Scrabster.


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Confirmed Unexploded Ordnance - Sofia Offshore Wind Farm



Mariners are the advised that following site survey and target investigation works, the survey vessel 'Go Electra' has identified confirmed Unexploded Ordnance (cUXO) within the Sofia Offshore Wind Farm array site.


Three confirmed Unexploded Ordnance have now been reported within the Sofa OWF array site. 

 

Information relating to the cUXO targets are detailed below;

 

Description of Target Latitude (DDM) Longitude (DDM) Water Depth Required Exclusion Zone
British Second World War Buoyant Mine. 54° 53.888825N 002° 12.475038E 25 metres 200 metres from Lat & Long
German SC 500-L2 Air Dropped Bomb-NEQ 220Kg 55° 0.456978N 002° 4.512952E 28 metres 200 metres from Lat & Long
Cylindrical shaped, thin casing and central tube for hydrostatic pistol / fuse observed on one end of the target. NEQ 150kg. 55° 1.153166N 002° 10.28621E 29 metres 200 metres from Lat & Long

 

The expected timeline for EOD operations and subsequent removal of these cUXO's is August 2022, with dates to be confirmed.

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HAVFRUE Fiber-Optic Submarine Telecommunications Cable Installation



Please be advised that the cable laying ship CS DURABLE will be conducting telecommunication cable installation operations for the HAVFRUE undersea cable system off the West coast of Ireland from Clew Bay. Work is scheduled to be commenced on 15th August and completing approximately 15th September 2022.


Installation of the remaining section of Segment 2 of the HAVFRUE fiber-optic submarine cable system, landing in Oldhead, Ireland.

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Dogger Bank B Inter-Array Cables Route Clearance



The Offshore Supply Vessel, WORLD PEARL, will perform the Route Clearance operations on Dogger Bank A Inter-Array Cables routes. The works will be performed in a single campaign, commencing on the 3rd August 2022 and continuing until approximately 30th of August 2022. The works will be continuous, 24 hours a day.


The operations include the relocation and/or removal of subsea objects, such as debris (e.g. steel wire) and boulders, by means of a subsea Grabbing Remoted Operated Vehicle (GROV) within the array cable routes.

 

During operations, the WORLD PEARL will be restricted in its ability to manoeuvre as defined under COLREGs (International Regulations for Preventing Collisions at Sea 1972) and will display the appropriate day shapes and lights. The vessel will also transmit an Automatic Identification System (AIS) message.

 

It is requested that all vessels maintain a minimum of 1.5Nm separation distance from the Offshore Supply Vessel and pass at reduced speed. Fishing gear or other equipment with seabed intervention should not be deployed when approaching the working corridor.

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Geophysical and environmental survey - Morgan and Mona Offshore Wind Farm



A geophysical, geotechnical and environmental survey of the proposed Morgan and Mona Offshore Wind Farm Project will be undertaken in June/July. The survey involves the use of Multibeam Echosounder (MBES) and Sidescan Sonar (SSS) some of which will be towed approximately 50m astern of the vessel.


The nearshore geophysical, geotechnical and environmental (benthic) survey of the proposed Morgan (North) and Mona (South) Offshore Wind Farm Project cable corridors will commence on the 10 June 2022. The survey involves the use of Multibeam Echosounder (MBES), Sub-bottom Profiler (SBP), Sidescan Sonar (SSS) and Magnetometer equipment, some of which will be towed approximately 50m astern of the vessel, during June. This will also include lowering equipment to the seabed to acquire environmental and geotechnical samples. Drop-down camera and grab samples will also be collected approximately every 1km during this period as well.

 

The survey area will cover areas inshore of the 15m water depth to approximately 2m. However, the survey vessel will only survey within a 1.5km width corridor within the survey area. The outline programme of works is provided below (not inclusive of weather delays).

 

All vessels are requested to maintain a safe distance (0.5 nm) from the survey vessel Titan Endeavour at all times. Vessels will display appropriate shapes and lights when surveying.

 

Approximate timings are as below:

 

Outline programme of works

Geophysical survey (inclusive of towed gear)

Mona

Complete

Complete

Morgan

Complete

Complete

Drop-down camera

Mona

Complete

Complete

Morgan

Start Date: Early – mid August

Estimated Duration: 2-3 days

Benthic survey

Mona

Start Date: Early – mid August

Estimated Duration: 2-3 days

Morgan

Start Date: Early – mid August

Estimated Duration: 2-3 days

 

 

Contact details for the Fishing Industry Representative are provided below.

 

Tom Watson (NFFO)

 

Email: tomwatsonfleetwood@btinternet.com

 

Telephone: +44 790 317 3624

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Hornsea Three Geotechnical Survey



Mariners are advised that Orsted Hornsea Project Three (UK) Limited (hereafter ‘Orsted’) will be commencing a scope of Geotechnical survey works from the 15nd of August 2022. The survey is being undertaken for the purposes of geotechnical investigations of the Hornsea Project Three Offshore Wind Farm (Hornsea Three), located within the UK Sector of the North Sea, off the coast of East Yorkshire.


Please be advised that the operations are anticipated to mobilise from the 15th of August 2022 with investigations targeting the site. The works will last for approximately 30 days . The exact survey dates are dependent on mobilisation time, weather and work progress. Note that the vessels will have limited manoeuvrability and it is requested that all vessels operating near the survey vessels maintain a safe distance (at least 500m) and pass at minimum speed.

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Seagreen Offshore Wind Farm – Marine Scotland Science Fish Distribution Survey



Marine Scotland Science survey activity will take place within the Seagreen Windfarm site boundary.


Mariners are advised that Marine Scotland Science will undertake a survey of fish distributions within the Seagreen Offshore Windfarm, as part of the PrePARED programme of works The survey will take place on MSS’s research vessel, MRV Alba na Mara. The vessel is expected to commence operations on or around the 5th of August. Alba na Mara works as a day boat (0700 to 1900), and in the evenings will either anchor in a sheltered bay near the shoreline or stay out at sea in areas clear of OWF. A constant 24h watch is in place. Demersal fish abundance, length and age frequency distribution data will be collected using fish traps (Figure 1A) and Baited Remote Underwater Video (BRUV) . BRUVs and Fish Traps will be left on the seabed for up to 2 and 5 hours respectively, and will be surface marked with buoys. The vessel will remain in vicinity of deployed equipment until recovery. Habitat data and sediment type at each BRUV/Fish Trap location will be collected using a CTD sensor lowered to 5m from the seabed, and a Day Grab which samples 0.096 m2 of sediment. The vessel will remain stationary for deployment and recovery. 

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Deployment of ADCP Device - Berwick Bank Wind Farm



A Notice to Mariners (First Issue) for the deployment of a bottom mounted ADCP device recording metocean data at three locations within the proposed Berwick Bank Wind Farm array area. An associated guard buoy is currently deployed at each location. Expected arrival on site is mid-October 2021 with the works completed over three days; weather conditions permitting. We would like to extend the validity period from 12th October – 31st December 2021 to allow for any eventualities.


Mariners are advised that SSE Renewables will be deploying a bottom mounted ADCP device recording metocean data at three locations within the proposed Berwick Bank Wind Farm array area. An associated guard buoy is currently deployed at each location. All locations referred to are outlined in Table 1 and displayed Figure 1.

 

It is proposed that three stumpy moorings (M) and a near-bed frame (NB) will be installed on the sea bed within 175m to the three guard buoys which were installed during a previous wave buoy campaign. These locations are all within the Berwick Bank Wind Farm (BBWF) in the outer Firth of Forth on the east coast of Scotland. It should be noted that the near-bed frame will only be situated at one of these three sites at any one time.

 

The equipment will be deployed during October 2021, with an estimated start date for deployment set for the 14th October 2021. However, this may be subject to change due to weather and/or operational delays. The stumpy moorings will be deployed for 12 months with maintenance and monitoring completed at each three-month interval. The one near-bed frame will be deployed for three months at two sites and 6 months at one site, equating to a deployment duration of 12 months in total.

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Vessel Traffic Survey in Berwick Bank Wind Farm



Mariners are advised that SSE Renewables will be undertaking a boat-based vessel traffic survey within the Berwick Bank Wind Farm array area.


The survey will be wholly within the proposed Berwick Bank Wind Farm array site boundary (see Figure 1 in the attached Notice to Mariners). The respective co-ordinates are listed in Table 1 in the attached Notice to Mariners.

 

It should be noted that SSE Renewables are not requesting fishermen to relocate gear as the vessel will not be restricted in movement and be able to work around any gear on location.

 

The survey work is being undertaken by Anatec and will be conducted from the vessel GV Star of Hope.

 

The survey will mobilise on the 2nd of August 2022, although this may be delayed as a result of weather conditions. The expected completion of the vessel traffic survey will be by the end of August 2022, weather permitting, and therefore there may be the potential for an extension to the work duration.

 

The survey will see the vessel primarily hold a location as central as practicable within the array site boundary shown in Figure 1 of the attached Notice to Mariners; however, it may need to move and / or relocate within the site boundary in order to complete the survey. The vessel will not be restricted in its movements and will always maintain a watch.

 

The survey requires the vessel to be present on location for a total of 14 days. If the weather does not allow for this to happen during one survey period then the 14 days will be split across multiple periods; however, the vessel will not be longer than 14 days in total on site.

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Norfolk OWF geophysical and geotechnical site survey



Please be advised that Fugro will be undertaking a geophysical and geotechnical site survey on behalf of Vattenfall Wind Power over the Norfolk future wind farms in the North Sea.


The MV Fugro Discovery will be deployed over the survey area starting on or around the 01.08.2022 and lasting until end of November 2022. The MV Fugro Discovery will be conducting offshore geophysical survey activities using MBES, SBP, SSS (towed) and MAG (towed). Other vessels should maintain an appropriate and safe distance of 500 m, where possible, when passing the survey vessel(s) whilst undertaking survey operations and should pass at the lowest possible speed to avoid vessel wash effects. 

 

Contact Details – Fisheries Liaison

For fishery queries please contact:

Jonathan Keer; jonathan@brownmay.com; 07850 604851

Freya Sandison; freya@brownmay.com; 07857 500609

 

Contact Details – Vattenfall

Further enquiries should be addressed to:

Mikkel Klahn; mikkel.klahn@vattenfall.com

Rory Anderson; rory.anderson@vattenfall.com

 

 

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Deployment of Two Metocean Buoys, with Co-Located Guard Buoys - Dogger Bank



The deployment of two metocean and two guard buoys at two locations within the Dogger Bank South Project Area has been extended into September 2022. Please maintain a 500 m clearance from the deployed equipment.


The guard buoys are yellow pillar shaped special marks, exhibiting a yellow St Andrews Cross day shape and radar reflector.  The buoys are each fitted with a yellow light, flash sequence: Fl (5) Y 20s 

 

The metocean buoys are 1.1 m diameter spherical buoys, fitted with a navigation light, flash sequence: Fl (5) Y 20s. 

 

Further details, including vessel informaiton, will follow ahead of deployment operations. 

 

 

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Berwick Bank - Geotechnical Survey Campaign - HDD Nearshore Cable Corridor



Mariners are advised that SSE Renewables will be returning to Berwick Bank Wind Farm area to undertake further Geotechnical survey work.


The survey will be within the proposed Berwick Bank Wind Farm nearshore export cable route (see Figure 1 in the attached Notice to Mariners). Respective co-ordinates are listed in Table 1 and Table 2 of the attached Notice to Mariners.

 

Following engagement with local fisheries, SSE Renewables are aware that the area is used for static fishing operations, and that relocation of fishing gear will be required, in agreement with affected stakeholders.

 

The survey work is being undertaken by Fugro and will be conducted utilising the Skate 3 Jack-Up barge. The Forth Trojan, a MCA workboat, will tow the jack-up barge to and from the survey site and act as a supply/support vessel during the field operations. 

 

The scope of work is within the nearshore cable route areas and will comprise nine boreholes. During the survey campaign, the vessel(s) will be deploying underwater drilling equipment to gather cores and also assess the geology in the area.

 

As a consequence of equipment being deployed and the modes of operation, all mariners are advised to keep a safe clearance distance of no less than 500 m from the vessel(s).

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Geophysical and Environmental Survey - Salamander Offshore WindFarm



Salamander Offshore Wind Farm Geophysical and Environmental Survey window will commence 5th August earliest and run until the 30th September 2022 latest (including potential for weather delays/downtime). Area includes 2km turning buffer for the survey vessel in the offshore and 500m turning buffer in the nearshore.


Salamander plan on undertaking geophysical survey and benthic drop-down video and grab survey activities. The survey window will commence on or around 1st July 2022 and, following a phased approach, is expected to take up to 42 days to complete to account for operational and weather delays. The anticipated survey window will run to 30th September 2022.

 

This survey will also aim to provide the necessary data to feed into the Environmental Impact Assessment (EIA) process. The Geophysical Survey will include Multibeam Echosounder (MBES), Acoustic MBES Backscatter (ABS), Side Scan Sonar (SSS), Magnetometer (MAG) and High Frequency Sub-Bottom Profiler (SBP) data at Windfarm Array Area (WAA) and Export Cable Route (ECR) locations. A coarse grid (1000 m x 1000 m line spacing) of Low Frequency SBP is also to be run at the WAA area and along the centreline of the ECR.

 

The geophysical scope of work will be divided in 3 main areas:

  • Offshore windfarm array area
  • Offshore section of export cable route
  • Nearshore section of export cable route

Water quality sampling will be required from the 8 m water depth contour up to the first 3 nm (from the shore) of the proposed ECR.

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Seabed Obstruction - Morgan & Mona Proposed Wind Farm Site



A seabed obstruction, approx. 1meter high, caused while retrieving the testing coil from the seabed. All fishermen are advised to read the notice and mark the position of the obstruction on their chart / plotter and keep clear.


Attached is a Petroleum Operations Notice No.2 issued by ‘NORMAND MERMAID’  informing of a seabed obstruction, approx. 1meter high, caused while retrieving the testing coil from the seabed

 

All fishermen are advised to read the notice and mark the position of the obstruction on their chart / plotter and keep clear.

 

Please do not hesitate to contact me if you are unsure about any of the above or require any further information, also please pass this information to any of your colleagues who you think might be interested.

 

These notices are primarily aimed at fishermen who operate in the area of the survey but this information will also be of interest to all other mariners and users of the sea who operate in the Eastern Irish Sea.

 

If you know of any fishermen or any other user of the sea who works the area and does not receive this information or anybody who would benefit from receiving this information please let me know

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Shetland HVDC Cable Lay Works Campaign 1



Scottish Hydro Electric Transmission Plc, are undertaking Campaign 1 of the Shetland HVDC Link cable installation. Campaign 1 begins at Noss Head, North of Wick and runs to until approximately KP155. The cable has successfully been laid on the seabed floor. The trenching vessel, Grand Canyon III, will be used to trench the cable to the required burial depth. For sections that cannot be trenched, rock placement will be undertaken. The rock placement works will be completed in two campaigns.


Planned Activities

 

The vessel, NKT Victoria, will be used to lay the cable on the seabed floor. Once the cable is laid on the seabed floor the vessel, Grand Canyon III, will be used to trench the cable to the required burial depth in the seabed. Any sections along the cable route that cannot be trenched, rock placement will be undertaken to achieve the required protection. The rock placement works will be completed in two campaigns. All works will be continuous, 24 hours a day.

 

Within the Noss Head Marine Protected Area the cable will be surface laid and protected by a cable protection system.

 

In the period between cable lay and cable burial, or protection by rock placement, the cable will be exposed on the seafloor. During this time the cable is sensitive to any external impact and constitutes a snagging risk for anchoring, fishing gear or other equipment with seabed intervention. For this reason, the cable corridor will remain closed for any fishing that interacts with the seabed, anchoring or use of other equipment with seabed intervention.

 

Please be aware that vessels NKT Victoria, Grand Canyon III and Grane R will be restricted in their ability to manoeuvre as defined under COLREGs (International Regulations for Preventing Collisions at Sea 1972). Masters of vessels are therefore requested to maintain their vessels at a minimum safe passing distance of 500 metres. NKT Victoria, Grand Canyon III and Grane R will display the appropriate shapes and lights in accordance with COLREGs Rules 16 and 18.

 

Co-ordinates of the cable corridor and charts of the working area are provided below. 

 

Guard Vessels

 

To protect the cable during installation activities Guard Vessels will be placed at approximately 15km intervals along the cable route. To provide the required coverage, approximately 7 guard vessels are expected to be utilised. The primary purpose of the Guard Vessels is to guard any unprotected cable along the cable route. The Guard Vessels will operate on a 24hr / 7 day per week basis. Any exchange of vessels shall be on site and coordinated so the unprotected cable is never unguarded.

 

It is requested that all vessels maintain a minimum of 500m safe distance from the installation vessels and pass at reduced speed. Fishing gear or other equipment with seabed intervention should not be deployed when approaching the cable corridor.

 

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Sofia OWF - Nearshore Landfall HDD Works



Mariners are advised that vessels “Forth Warrior” and “Three Rivers” are expected to commence landfall HDD operations within the nearshore area of the Sofia OWF export cable route on or around 7th August 2022 and are expected to last until 31st October 2022.


Sofia OWF HDD works will comprise of non-invasive multibeam survey (MBES), subsea trenching and diving operations.

 

Both Vessels shall be travelling daily to site from the Port of Hartlepool, with works being undertaken during daylight hours only (weather permitting).

 

The Multicat Vessel “Forth Warrior” shall deploy a 4 Point Mooring arrangement which will remain on location throughout until 31st October 2022 and will comprise of the following components at each location:

 

Anchor Components and Type

Component Type
Anchor: 2t Delta Flipper Anchor c/w 54 metres of stud link chain remaining on the seabed.
Wire on anchor / leading to the surface can buoy: 18metres (36mm galvanised steel diameter).
Can Buoy: 205ltr drum (970mm length x 580mm diameter) Yellow in colour.
Light on Can Buoy: White light flashing Iso (equal) phase.
Pick up pendant on Can Buoy: 15metres (18mm Polypropylene Rope)

 

The above components shall be placed in the following coordinates and all vessels are to avoid all of the below anchor coordinates by a minimum 250m radius at all times.

 

Coordinates of Anchor Locations

 

Lattitude (DDM) Longitude (DDM)
54° 36.21399721' N 001° 00.96500683' W
54° 36.32825771' N 001° 00.79593573' W
54° 36.39242400' N 001° 00.92659705' W
54° 36.27734109' N 001° 01.11149999' W

 

The following project vessels shall be monitoring VHF 16 during the scope of the works and shall also be exhibiting the correct day shapes and flag for vessels engaged in diving operations.  They will be restricted in their ability to manoeuvre and at anchor.

 

Vessel Name Vessel Type Length (m) MMSI Number Call Sign
Forth Warrior 4 Point Mooring Multicat 27.70 235116011 2JHR8
Three Rivers Multibeam Survey Vessel 6.20m 235091048 2FGL2

 

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Seabed Activity Bluemull Sound (Shetland) – Subsea Tidal Array



The purpose of the operation is to conduct work on a subsea tidal energy array in the Bluemull Sound, Shetland.


A multicat vessel the Delta Marine Voe Jarl, call sign MSBB3 (or a similar vessel) will conduct offshore and subsea operations. Works will include loading and preparatory work at Cullivoe Pier and Belmont Pier. Operations could take place during the day or at night.   Operations will be conducted within the works area bounded by points A/B/C/D below (vessels should keep well clear e.g. 100m) and up to 50m either side of the cable corridor route; see waypoints below.

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Notice of activities associated with Beatrice Offshore Wind Farm:Exposed Cable Section



Following recent asset surveys at BOWL, data indicates a potential exposure at inter-array cable G4-G5, between KP 0.627 to KP 0.669, investigations are underway to confirm if an exposure is present. There are also several sections with shallow burial depths as shown in the attachment.


Area of Planned Activity Following recent asset surveys at BOWL, data indicates a potential exposure at inter-array cable G4-G5, between KP 0.627 to KP 0.669, investigations are underway to confirm if an exposure is present. There are also several sections with shallow burial depths as per the below tables. This NtM is being provided for information, further details will follow.

 

MARINERS ARE REMINDED to navigate with caution and keep continued watch on VHF Ch. 70 / 16 when navigating the area.

 

Fisheries Liaison Fisheries liaison associated with the activity will be co-ordinated by Brown and May Marine.

For any commercial fishery queries please contact: Alex Winrow-Giffin Tel Mobile +44 (0) 7760 160039 alex@brownmay.com

John Watt Tel Mobile +44 (0) 7590 880746 john.watt@brownmay.com

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Moray West Offshore Wind Farm: Offshore Geotechnical and Geophysical Surveys July 2022



This notice to mariners is to inform that Moray Offshore Windfarm (West) Limited (Moray West) will be carrying out geophysical and geotechnical site investigations from a survey vessel at the Moray West Offshore Wind Farm site.


This notice to mariners is to inform that Moray Offshore Windfarm (West) Limited (Moray West) will be carrying out geophysical and geotechnical site investigations from a survey vessel at the Moray West Offshore Wind Farm site.

 

The Moray West site is located on the Smith Bank in the Outer Moray Firth, approximately 22.5km from the Caithness coastline. The offshore wind farm site covers an area of approximately 225km2.

 

The vessel works are to take place within the blue boundary shown in the figure in the attached NtM.

 

The works are anticipated to commence on, and no earlier than, 19 July 2022, and survey duration is expected to be approximately 6 weeks.

 

Scope of work is in two parts: Part 1: A Geophysical survey will comprise hull-mounted multi beam echo sounder (MBES) and Sub-Bottom Profiler (SBP) system, with towed side scan sonar (SSS) and magnetometer and 2D Seismic arrays. Part 2: Approximately 85 geotechnical sites will be subject to cone penetration testing and vibro coring. The coordinates of the work site boundary are presented in the attached NtM.

 

Site investigation operations will be carried out by the survey vessel Ocean Observer. Titan Discovery will be towing geophysical equipment (SSS and 2D seismic array) which may be up to 300 m behind the vessel. It is requested that all vessels operating within the area keep a safe distance (at least 500m) and pass at minimum speed to reduce vessel wash.

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Dogger Bank A Export Cable Reduction to Charted Depth



During the campaign to lay and bury the Dogger Bank A export cable, it has been necessary to install rock berm protection over the cable in locations where it has not been possible to trench bury the cable


In the section of cable shown in Figure 1 of the attached NtM, the rock berm installation has been installed to a maximum height of approximately 0.6m above seabed level. In these locations, this represents a reduction in depth at Lowest Astronomical Tide (LAT) of approximately 5%.

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Baited camera surveys of offshore wind farm seabed habitats



The University of Exeter will undertake approximately 100 short term deployments of Baited Remote Underwater Video systems (BRUVs) to the seabed across the Beatrice, Moray East and Moray West offshore wind farms (OWFs). These works are being undertaken for the PrePARED project. PrePARED is a collaborative research project coordinated by Marine Scotland Science that aims to study predator (seabird & marine mammal) and prey (fish) distribution and behaviour in and around offshore wind farms.


Each BRUV sampling event lasts approximately one hour on the seabed. BRUV systems are lightweight carbon fibre camera frames with weighted legs. The systems can be rapidly deployed and retrieved using a simple single mooring line reaching from the seabed to the sea surface. BRUVs are deployed in clusters of three independent units (approx. 120 metres distance from each other). Each cluster either encircles a wind turbine jacket structure or is positioned away from these structures at “reference" sites (but remaining within the overall extents of the offshore wind farms). BRUV systems are marked at the sea surface using trawl floats and surface marker buoys marked EX1 to EX8 (see Figure 1). Multiple deployments of up to nine BRUVs (in three clusters) at any one time can be deployed where weather and operating conditions allow. BRUV sampling will only be undertaken in daylight hours.

 

Exact locations of BRUV system deployments are dependent upon prevailing wind, tide and wave conditions across the offshore wind farms. Intended wind turbine jacket structures to be surveyed using BRUVs are shown in Figure 2 (see also Table 1 for list of turbine reference numbers). "Reference" sites away from wind turbine jacket structures that require surveying will be decided upon based on prevailing weather and operational conditions each day (indicative locations only shown in Figure 2). 

 

All deployments and retrievals of BRUV systems will be made by the vessel Waterfall operated by Moray First Marine (see Figure 3).

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Maintenance of Acoustic Monitoring Devices Revision 3 - Seagreen Offshore Wind Farm site



Maintenance works will be conducted on the five acoustic monitoring devices located in and around the Seagreen Offshore Wind Farm site. On behalf of Marine Scotland Science the vessel Waterfall will conduct the works on or around the 17th of July 2022


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Deployment of FLiDAR buoys - Blyth NOAH met mast site



Fugro GM Marine Limited (Fugro) is to carry out deployment of one floating LiDAR buoy at the NOAH mast offshore Blyth. The deployment of the equipment is planned for as close to the 22nd July as practicable and equipment will remain on site for an estimated duration of 30 days. Deployment operations are expected to take one day. Operations will be conducted with the Tees Guardian call sign: 2IJH2 and will involve towing the equipment from the Port of Blyth to the deployment site.


The equipment is an integrated Seawatch Wavescan buoy and ZX 300M LiDAR; the purpose of the equipment is to collect oceanographic and meteorological data using a single platform. The equipment is supplied and charged by an onboard power system which uses methanol fuel cells and solar panels to recharge onboard lead acid batteries.

 

The equipment is equipped with a F1 (5) Y 20 s light with 4-5 nautical mile range; the light is mounted at the top of one of the masts, approximately 4 m above sea level.

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GI Survey - White Cross Offshore Wind Farm



From the 29th of May 2022, N-SEA will be conducting geophysical, (limited) UXO and environmental surveys within the area. The offshore works will be completed by N-Sea personnel on the survey vessel ‘Braveheart Spirit’ and the ‘Geo Focus’. The Benthic scope (offshore and nearshore) will be executed by Ocean Ecology Ltd.’s personnel and vessel ‘Argyll Explorer’. The near-shore scope (geophysical) will be executed by Ultrabeam’s personnel and vessel ‘Elysse’.


Please be advised that from the 29th of May 2022, N-SEA will be conducting geophysical, (limited) UXO and environmental surveys within the area shown in Figure 1. The survey consists of an offshore windfarm location, and its export cable route corridor. The geophysical and UXO survey will employ MBES, SSS, High-resolution Sub-Bottom Profiler, Single Channel Sparker and Magnetometers. The environmental survey will acquire drop down video footage and grab samples. Sparker operations are limited to the OFW only.

 

The offshore works will be completed by N-Sea personnel on the survey vessel ‘Noordhoek Pathfinder’ and the ‘Geo Focus’. The Benthic scope (offshore and nearshore) will be executed by Ocean Ecology Ltd.’s personnel and vessel ‘Argyll Explorer’. The near-shore scope (geophysical) will be executed by Ultrabeam’s personnel and vessel ‘Elysse’.

 

Full vessel details are presented in Table 1 & 2.

 

The ‘Geo Focus’ will arrive end of May in the field, while the ‘Noordhoek Pathfinder’ is expected to join operations mid July.

 

Argyll Explorer will start operations on 14/07; Elysse from 26/07.

 

All environmental sampling will be executed by N-Sea subcontractor Ocean Ecology.

 

The survey operations involve towed survey equipment (SSS, Magnetometer and Sparker), and no equipment will be left on the seabed.

 

This notification is intended for circulation to all interested parties undertaking or managing activities in the vicinity of the planned survey works.  If you would like further details regarding the surveys please contact the N-Sea project manager using the contact details at the head of this communication.

Liaison and General Operational Principles

  1. The survey contractor will ensure advance notice of survey works is provided to all marine users.
  2. As near-shore areas have the potential to hold higher densities of static fishing gear, all survey operations will be undertaken during daylight hours.
  3. Where considered appropriate, a Fisheries Liaison Officer will be used to provide advice to the survey contractors and facilitate liaison with the fishing industry.
  4. During liaison, should areas of high fishing density be identified, best efforts will be made to modify survey plans (either the location of survey sites or timing of operations) to avoid damage to both survey and fishing gear.
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Awel y Môr Offshore Windfarm: Geotechnical Site Investigation, August 2022



Mariners are advised that a Geotechnical Site Investigation is due to be conducted by the drilling vessel Gargano at 5 locations between 12km and 17km off the North Wales coast in August 2022. This work is being carried as part of the survey operations for the proposed Awel y Môr Offshore Windfarm.


A series of seabed samples are due to be taken from within the boundary of the proposed Awel y Môr Offshore Wind Farm by the survey vessel Gargano, starting on 1st August 2022

 

The survey operations will take between 3-5 weeks, depending on weather and sea conditions.

 

Several samples will be taken at each of 5 borehole locations, which are located between 12 and 17km of the North Wales Coast.  The location of the boreholes are given in this notice and also in the attached Notice to Mariners.

 

The survey is due to be carried out by the vessel Gargano which is a drilling vessel with a green hull and white superstructure.  It measures 72m long with a beam of 16m.  Details for the vessel are provided below, including a link to its present location on the MarineTraffic website:-

  • Gargano: drilling vessel | MMSI 235362000 | Call sign VSMW5 | https://www.marinetraffic.com/en/ais/details/ships/shipid:202357/mmsi:235362000/imo:9249403/vessel:GARGANO 

Operations will be conducted on a 24 hour basis.

 

Other vessels are requested to keep their distance, maintaining at least a 500m distance, and to pass at a minimum speed to minimise vessel wash.

 

Details of the vessel are provided in the Notice to Mariners.

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Shetland HVDC - Clump Weights



Scottish Hydro Electric Transmission Plc, have carried out a pre-lay grapnel run (PLGR) and Route Clearance (RC) of Out of Service (OOS) Cable crossings along the Shetland HVDC Link. The works are now complete and items detailed have been deposited permanently on the sea bed.


The Shetland HVDC link is a critical electricity transmission link and will form part of the electrical transmission grid that is essential to the transport of renewable energy between the locations where it is generated and areas of demand, and the delivery of both Scotland’s and the United Kingdom’s 2030 climate change targets.

 

The OOS cables were removed along the route and, in accordance with International Cable Protection Committee procedures, all cable ends left on the seabed were weighed to seabed by the means of clump weights. The clump weights are concrete discs that are 0.5m diameter and 0.2m thick. A total of 10 clump weights have been deployed and remain at their location indefinitely. They do not pose a risk to mariners; this Notice is being distributed for information purposes only. 

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USV Operations from Amble/Blyth



Operations of remotely piloted Uncrewed Surface Vessels(USVs) are planned out of the ports of Amble / Blyth during July and August 2022.Up to four USVs will be operational at any one time. The vessels will be engaged in survey activities associated with the investigation of a site for development of an offshore wind farm in the North Sea, approximately 40km off the east coast of Scotland.


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Offshore Sub-station Hook Up & Commissioning Activity - Seagreen Offshore Windfarm Rev2



Commissioning activities will continue at the Seagreen Offshore Wind Farm Sub-Station platform. The Borr Ran jack up barge will depart the Seagreen site on the 9th of July.


On behalf of Seagreen Wind Energy Ltd, Petrofac will commission the Seagreen offshore sub-station platform.

The Jack Up Barge Borr Ran will depart the Seagreen site on the 9th of July. The Borr Ran will be assisted in departing the site by three tugs, details below.

 

- Pacific Discovery

- Bugsier 2

- Multratug 19

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Site Survey and Target Investigation - Sofia OWF Export Cable Route & Array



All Mariners are advised that vessel Go Electra will commence mobilising on or around 30th June 2022 in readiness for commencing site survey and UXO target investigation works from early July 2022. The works will entail two phases.


Phase One: Investigating seabed targets that have the potential to be UXO or archaeological items of interest by means of a Work Class ROV (WROV) along the proposed route of the Export Cable and within the Sofia Array (Foundation and Wind Turbine Generator locations).  Phase one will be undertaken 24 hours per day.

 

- Go Electra will visit the location of the target to identify the nature of the target.

- In the event UXO or archaeological targets are found both will be fully investigated and left in situ.

- In the event there is debris that could cause disruption to site works the debris will be moved to a safe area.

- Boulder recovery works from within the footprint of the Offshore Converter Platform using clamshell grab and relocation of boulders within the DCO order limits.

 

End of Phase One activities. Vessel returns to port for reconfiguration for Phase Two activities.

Phase Two: Removal / Relocation / Detonation (where required).

 

Phase two will be undertaken during daylight hours only.

 

A UXO target will be assessed by Explosive Ordnance Disposal / UXO experts onboard the vessel.

The condition, state of burial, size, etc. of the target is assessed.

The options for UXO clearance are limited to:

- Disposal (detonation) of the UXO.

- Relocate the target using remote means to a suitable location.

- Leave the UXO As-found.Note: Prior to any disposal by detonation, the following warning protocol shall be followed by the Go Electra: At Local Time minus four hours, thirty minutes and ten minutes, safety messages will be transmitted on VHF Channel 16 and as designated by the regional VTS authority if required.

- Securite x 3, All Ships x 3.

- This is Vessel “Go Electra” x 3.

- I am conducting Explosive Ordnance Disposal Operations.

- There will be a controlled underwater explosion in position: Lat:……… Long:……. At: (Local Time)

- All Vessels are requested to keep clear of position by one Nautical Mile.

- This is Vessel “Go Electra”

 

NOTE: The final ten second countdown leading up to the detonation will also be transmitted on VHF Channel 16. It is always requested that all vessels maintain a minimum of 500m separation distance from the Go Electra, adhere to Collision Regulations and pass at reduced speed during phase one works when exhibiting the shapes / lights identifying the vessel as Restricted in her Ability to Manoeuvre. During phase two works, a minimum of one Nautical Mile clearance is requested when detonation activities are taking place as outlined by the above safety broadcast on VHF. Go Electra shall be supported in her activities by the presence of Guard Vessels named “Atlas B” and “Moremma”  

 

Note: - Fishing gear shall not be deployed within 500m either side of the centre line as detailed by the coordinates of the works area. - Go Electra will frequently deploy two Met-Ocean Buoys within 500m either side of the line created by the coordinates of the works area. The latest positions of the Met-Ocean Buoys can be requested locally from Go Electra. - During Phase Two works, Go Electra shall be deploying noise monitoring equipment on the seabed to support the works. The positions of the noise monitoring equipment can be requested locally from Go Electra.

 

The following vessels will commence operations on the Sofia OWF project, as detailed within project Notice to Mariners;

 

Vessel Name Vessel Type Call Sign MMSI Number Length Beam Draught Tonnage IMO Number
Go Electra Survey & Clearance Vessel V7ZR6 538005197 79.67m 16.4m 5.6m 4071 9545481
Atlas B Guard Vessel MPUD3 235001670 21.8m 5.2m 3.0m 173 8792415

Moremma

Guard Vessel MKHC6 235007170 22.95m 7.07m 3.0m 172 9545481

 

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Foundation Installation Campaign - Dogger Bank A



The Offshore installation vessel, Innovation, will install monopile foundations, within the Dogger Bank A construction area.


The works will commence on the 13th of July 2022, continuing until approximately Q3 2023 The works will be continuous 24 hours a day. Charts of the DBA construction area and foundation locations are provided below. The first three foundation locations are highlighted in red. A running list of the next locations to be installed and completed foundation locations will be presented in the Weekly Notice of Operations.

 

During operations, the Innovation will be restricted in its ability to manoeuvre as defined under COLREGs (International Regulations for Preventing Collisions at Sea 1972) and will display the appropriate day shapes and lights. The vessel will also transmit an Automatic Identification System (AIS) message.

 

During operations, a Statutory Safety zone of 500m radius will be in place around the Innovation during the installation of foundations.  The safety zones will be monitored by a guard vessel. The primary response will be to warn passing traffic of the ongoing works and any active safety zones, and to alert any vessels where an infringement may occur or has occurred.

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Survey - Hornsea Four



Orsted Hornsea Project Four (UK) Limited (hereafter ‘Orsted’) will be commencing a scope of Geotechnical survey works from the 20th of June 2022. The survey is being undertaken for the purposes of geotechnical investigations of the Hornsea Project Four Offshore Wind Farm (Hornsea Four) project, located within the UK Sector of the North Sea, off the coast of East Yorkshire. From 15th June 2022 for 91 Days using vessel Gargano call Sign: VSMW5


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Geophysical and Unexploded Ordnance Survey



Seaway 7 will conduct a geophysical/unexploded ordnance survey within the boundaries of the Seagreen Offshore Wind Farm. On behalf of Seagreen Wind Energy Ltd. Seaway 7 will commence a geophysical/unexploded ordnance survey on four spare asset locations within the boundary of the Seagreen site. The survey vessel Mersey Guardian is expected to arrive at site on or around the 25th of June to commence calibrations and survey operations.


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Temporary marker buoy - Export cable ducts of the Dogger Bank A and Dogger Bank B export cables



This notice to mariners (NtM) relates to the location of a temporary marker buoy positioned between the export cable ducts of the DB A and DBB export cables


This revised notice to mariners (NtM) relates to the location of a temporary marker buoy positioned between the DBA and B export cable ducts.

 

The Nearshore works for DBA export cable have now been completed, with the cables and cable ducts now fully buried. The temporary marker buoy has now been moved back to a position between the DBA and DBB duct exit points. The buoy will remain in this position until the nearshore works for DBB commence in 2023.

On completion of all the nearshore works, estimated for end July 2023, the temporary marker buoy will be removed from site. This NtM supersedes LF500013-MIP-DOG-NOT005 Rev03, issued on the 19th December 2021

 

The marker buoy characteristics are: Yellow Special Mark, light pattern: Fl(Y)5s Mariners are reminded to navigate with caution, keeping a safe passing distance from the temporary marker buoy and keeping a continuous watch on VHF Ch. 70/16 when navigating the area.

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White Cross - Floating LiDAR system deployment



Please be advised that from the 09th of July 2022, one Floating LiDAR system is to be deployed to the Celtic sea to record wind and metocean data.


Please be advised that from the 09th of July 2022, one Floating LiDAR system is to be deployed to the Celtic sea to record wind and metocean dataPosition and coordinates where the FliDAR buoy will be deployed are provided in the table and charts below. The buoy will be deployed from Padstow harbour. The buoys will be in situ for 12 months (but up to 24 months).

 

The FLiDAR equipment will undergo regular scheduled maintenance during the operation period estimated to be 4 times a year, further notice to mariners will be issued confirming the dates and maintenance activities.

 

Following system checks onshore, the buoys will be either towed into position by a small works vessel or be deployed from a vessel through lifting of the buoys from the deck into the water. Key stages of the deployment are listed below:

1. unit delivered by road and assembled ashore;

2. unit, concrete sinker and mooring system loaded onto multipurpose vessel and taken to site;

3. concrete sinker and mooring system deployed from the vessel; and

4. unit deployed from the vessel and then attached to the mooring system.

 

Floating LiDAR Description

The floating lidar buoy is approximately 5m in length, 3m wide and 4.75m in height, with an anchor (dead man) weighing 2500kg. The system is comprised of the measurement buoy itself and a site-specific single catenary mooring.

 

Liaison and General Operational Principles

  1. The survey contractor will ensure advance notice of the installation works is provided to all marine users and the location of the buoy once installed is provided.
  2. Where considered appropriate, a Fisheries Liaison Officer will be used to provide advice during installation of the buoy and during the full deployment period of 12 months. Name: Rhys Kibble         Email:  rhys.kibble@brownmay.com          Telephone: +44 (0) 7809 337 349  

Programme

Deployment Date

From the 9th July up to 23rd July 2022 dependent on weather conditions

This date is subject to weather permitting, and therefore there may be the potential for an extension to the work duration.

Operational period

1 Year (up to 2 years from)

 

 

Safety

Lighting System

Colour: Yellow

Location: Top side of the FLS

Height of light above water: 3 metres

Flashing Intervals ODAS FI(5) 20s (range 5 nautical miles)

 

24 Hour Emergency Contact Numbers:

AKROCEAN

Mathieu DADEN +33 (0) 6 78 03 72 15

Control room VALEMO +33 (0)5 47 30 20 60

 

EMERGENCY

112 / 999 ask for the Coast Guard

VHF Channel 16

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Floating LiDAR buoys & metocean buoys - Morgan & Mona



Metocean and floating LiDAR instrumentation have been successfully deployed within the Morgan and Mona project sites.


Metocean instrumentation and floating LiDAR instrumentation have been deployed within the boundary of the proposed Morgan (North) and Mona (South) Offshore Wind Farm Project sites in the Irish Sea.

 

The metocean instrumentation within the Mona and Morgan Project site were deployed successfully in November 2021. It should be noted that instrumentation is deployed on the seabed some distance from the surface buoy, so marine users are requested to maintain the safe clearance distances as outlined in Section 3 below. Further details on the mooring design are available in Section 7. Metocean instrumentation at the Mona (South) location has now been successfully redeployed and will remain on location until planned recovery approximately November 2022. As-laid coordinates have been updated for the metocean equipment, following unplanned works which were undertaken during mid-June.

 

The floating LiDAR instrumentation were successfully deployed at the Mona Project site and the Morgan project site in March 2022. It should be noted that instrumentation is deployed on the seabed some distance from the surface buoy, so marine users are requested to maintain the safe clearance distances as outlined in Section 3 below. Further details on the mooring design are available in the attached NtM. The AIS on the Mona floating LiDAR is not currently operating, but all other safety measures remain active and functional; repair of this fault is planned for early July.

 

The previous Notice to Mariners indicated that an additional mooring was planned to be deployed at the Morgan site, however this is no longer planned.

 

The equipment will be maintained in position via appropriate mooring systems and will gather metocean data to inform the proposed Project. Details of the devices and relevant Aids to navigation are provided below.

.

All vessels are requested to maintain a safe distance (500m) from the maintenance vessels (Forth Jouster, Vital or Vector) at all times. All vessels are requested to maintain a safe distance (400m) from the deployed monitoring equipment at all times.

 

Further details can be found within the attached NtM.

 

Morgan

Name: Fugro Buoy WS188

MMSI: 992351368

 Mona

 Name: Fugro Buoy WS187

 MMSI:  992351369

 Morgan

 Name: Morgan 01

 MMSI: 992351367

 Mona

 Name: Mona 01

 MMSI:  992351366

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Geotechnical Survey - Hornsea Three



Mariners are advised that Orsted Hornsea Project Three (UK) Limited (hereafter ‘Orsted’) will be commencing a scope of Geotechnical survey works from the 2nd of July 2022. The survey is being undertaken for the purposes of geotechnical investigations of the Hornsea Project Three Offshore Wind Farm (Hornsea Three) project, located within the UK Sector of the North Sea, off the coast of East Yorkshire.


Please be advised that the operations are anticipated to mobilise from the 2nd  of July 2022 with investigations targeting the site.  The works will last for approximately 50 days .  The exact survey dates are dependent on mobilisation time, weather and work progress.

 

Note that the vessels will have limited manoeuvrability and it is requested that all vessels operating near the survey vessels maintain a safe distance (at least 500m) and pass at minimum speed.

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Geotechnical Survey - Morgan and Mona Offshore Wind Farm



The offshore geotechnical survey of the proposed Morgan (North) and Mona (South) Offshore Wind Farm Project array areas will commence on the 14 June 2022 and 19 June 2022.


The offshore geotechnical survey of the proposed Morgan (North) and Mona (South) Offshore Wind Farm Project array areas will commence on the 14 June 2022. The investigation involves the drilling, sampling and coring of 30 boreholes throughout the two proposed areas, utilising the vessel Fugro Synergy. The vessel will be stationary at each borehole location for up to 3 days to allow the samples and cores to be taken from the seabed.

 

In addition to the above, further offshore geotechnical survey of the proposed Morgan (North) and Mona (South) Offshore Wind Farm Project array areas will commence on the 19 June 2022. The investigation involves acquiring up to 120 Cone Penetration Tests (CPTs) (deep push) throughout the two proposed areas, utilising the vessel Normand Mermaid. The vessel will be stationary at each CPT location for up to 6 hours to allow the samples to be taken from the seabed.

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Outfall Scour - Jarrow Staithes



The construction of an outfall scour below MHWS adjacent (just east of) Jarrow Staithes as part of a river water abstraction/discharge process to create energy for a district heating installation. The work will involve construction plant above MHWS, with workers on foot then assisting the positioning.


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Bridge Construction between Staithes and Riverbank



The construction of a bridge between the existing staithes at Jarrow and the riverbank as part of a river water abstraction process to create energy for a district heating installation. Abstraction Bridge Construction – programmed to commence Monday 13th June 2022 subject to obtaining of transport permits for the delivery of the bridge to site, and then to continue for a further period of 10 weeks.


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Mull – Coll Subsea Cable Installation



Mull – Coll: The project is experiencing significant delays for offshore cable install and no fishing gear clearance is required until further notice. The previous Notice to Mariners, dated 28th March 2022, is now cancelled. Please be advised that Global Offshore (on behalf of SHEPD) are conducting the installation of the replacement Mull-Coll submarine electricity cable. The purpose of this notice is to outline the working area for the vessels along the cable lay route.


Mull – Coll: The project is experiencing significant delays for offshore cable install and no fishing gear clearance is required until further notice. The previous Notice to Mariners, dated 28th March 2022, is now cancelled. 

 

 

Please be advised that Global Offshore (on behalf of SHEPD) are conducting the installation of the replacement Mull-Coll submarine electricity cable. The purpose of this notice is to outline the working area for the vessels along the cable lay route. There will be two vessels associated with the Mull-Coll cable installation and post-lay survey process. In summary:

1. Boulder Relocation – Global Symphony (entire route)

2. Cable Lay Vessel – Global Symphony (entire route)

3. Post-Lay Inspection Burial (PLIB): Global Symphony (entire route)

4. Post-Lay Nearshore Survey of Cable: Delta 9151 (or equivalent vessel depending on availability)

 

Vessels carrying out the subsea cable works will be restricted in their ability to manoeuvre and will display the appropriate lights and shapes. Other vessels are requested to pass at a safe speed and provide a minimum clearance of 500m from the construction vessels during marine operations (COLREGs Rule 16 & 18). Vessels associated with the works will monitor VHF Channel 16 at all times.

 

Description of Installation/PLIB Operations CLV Global Symphony will be relocating boulders in preparation for cable lay operations and will then lay the Mull to Coll cable. The PLIB operations will be carried out by the Global Symphony immediately after completion of cable lay operations. The nearshore sections of the marine cables will be surveyed using the Delta 9151 (or equivalent vessel). All above-described operations will involve ROV equipment deployed to seabed. The duration of the operations is shown on Table 1. All vessels will be limited in maneuverability. Other vessels should maintain an appropriate and safe distance of 500m when passing the vessels undertaking cable operations and should pass at the lowest speed to avoid vessel wash effects. The vessel will be working 24 hours per day during these operations.

 

 

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Survey - Hornsea Three Offshore Wind Farm



Mariners are advised that Orsted Hornsea Project Three (UK) Limited (hereafter ‘Orsted’) will be commencing a scope of Geotechnical survey works from the 15th of June 2022. The survey is being undertaken for the purposes of geotechnical investigations of the Hornsea Project Three Offshore Wind Farm (Hornsea Three) project, located within the UK Sector of the North Sea, off the coast of East Yorkshire


Please be advised that the operations are anticipated to mobilise from the 15th of June 2022 with investigations targeting the site.  The works will last for approximately 91 days .  The exact survey dates are dependent on mobilisation time, weather and work progress.

 

Note that the vessels will have limited manoeuvrability and it is requested that all vessels operating near the survey vessels maintain a safe distance (at least 500m) and pass at minimum speed.

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Landfall Works at Boygrift - Viking Link Project



Mariners are advised about landfall works at Boygrift, Lincolnshire (English Landfall) being undertaken for the Viking Link project which is an HVDC electricity transmission interconnector between Denmark and England, a joint venture between National Grid and Energinet. The cable landfall works include cable burial work, diving operations and soil reinstatement with expected completion in UK waters by the end of August 2022.


The marine landfall works area is shown. Currently round Norwegian marker buoys are marking areas where spoil is temporarily left in place and poses a hazard to navigation.


The works will be managed by Prysmian PowerLink and operations will resume from August 2022. In the meantime, a dedicated guard vessel will be in position to guard the area at the landfall up to approx. 1km from the shore. 

 

Vessels are requested to pass at a safe speed and distance and fishing vessels are advised to remain a safe distance, approximately 1000m from the areas identified. Dive works will be ongoing and during the works the vessel will have restricted manoeuvrability as it completes its work scope.


The Communication between the vessels will be through CH67 & 72.


VHF CH 16 will be monitored at all times and will be used to contact the coastguard in the event of an emergency
 

 

 

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PrePARED Fish Tracking Array - Beatrice and Moray East Offshore Windfarms



Marine Scotland Science (MSS) intend to install 87 acoustic fish tracking moorings in the Beatrice and Moray East Offshore Windfarms areas (BOWL (38 moorings) and Moray East (49 moorings)) as part of the PrePARED programme of works. PrePARED is a collaborative research project coordinated by MSS which aims to concurrently study predator (seabird and marine mammal) and prey (fish) distribution and behaviour in and around offshore wind farms. Deployed: 10 April 2022. Removed: 30 August 2026.


Marine Scotland Science (MSS) intend to install 87 acoustic fish tracking moorings in the Beatrice and Moray East Offshore Windfarms areas (BOWL (38 moorings) and Moray East (49 moorings)) as part of the PrePARED programme of works. PrePARED is a collaborative research project coordinated by Marine Scotland Science which aims to concurrently study predator (seabird and marine mammal) and prey (fish) distribution and behaviour in and around offshore wind farms. The moorings hold research equipment that support hydrophone receivers. These receivers log the presence of fish, such as Cod, Haddock and Whiting which will be tagged with acoustic ID transmitter tag s (they will also record salmon and seatrout smolts migrating from Moray Firth Rivers tagged by the Atlantic Salmon Trust (AST) should they pass within range).

 

The moorings will be deployed from the 10th of April 2022 by a the Waterfall operated by Moray First Marine. The moorings will be removed by the 30th of August 2026.

 

Acoustic fish tracking moorings will not be surface marked and will be located on the seabed. The array moorings will extend vertically no more than 4 metres. The moorings will be serviced by boat, using the inbuilt acoustic recovery system. In the unlikely event of failure in the acoustic release system an ROV will be used from the same boat to service the mooring. Please note the acoustic fish tracking moorings are being deployed as close to the wind turbine generators as possible to minimise interference with fishing operations (50m), should these be accidently caught only the instruments are required to be returned and the location of the discarded weight should be supplied to MSS for recovery later.

 

Fish capture traps and timed-release cages (8 traps and cages in total) will be deployed in Moray East and Beatrice sites. These traps and cages will be used in the capture and managed release of fish needed for internal electronic tagging with acoustic ID transmitter tags. Traps and cages will be present at Moray East and Beatrice for up to 10 days commencing 13th of April. Traps and cages will move at 1 to 2-day intervals. All traps and cages will be marked with creel style floats and clearly marked “Marine Scotland Science” and be marked with an AIS beacon (visible as MARLAB 1 – MARLAB 8). Traps and cages will be at least 100 metres from turbine locations. Locations of traps and cages will be notified to the relevant windfarm Marine Control Centre as appropriate.

 

Contact details

 

All enquiries should be made to the Marine Scotland acoustics mailbox acoustics@scotland.gsi.gov.uk) marked for the attention of Robert Main. Switch Board Tel: 0131 244 2500

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Shallow Burial - Amitie Cable System



Alcatel Submarine Networks UK Ltd (ASN) was contracted to carry out construction activities for the AMITIÉ cable system. The AMITIÉ cable system spans nearly 6,600 km in total with the UK landing point in Widemouth Bay, near Bude, Cornwall. Shallow burial areas and short sections of surface laid/exposed cable in UK territorial waters. The areas of shallow burial and surface laid cable are due to hard ground or rock, where cable burial to the target depth was not possible.


The construction activities in the area shown were completed nearshore on 7th July 2021 using the vessel “Viking Energy”, and offshore on 24th August 2021 using the vessel “Ile de Brehat”. Post-lay inspection and burial (PLIB) works were completed on 29th November 2021 using the vessel “Ile d’Aix”.


This notice is issued to inform of as-laid shallow burial areas and short sections of surface laid/exposed cable in UK territorial waters. The areas of shallow burial and surface laid cable are due to hard ground or rock, where cable burial to the target depth was not possible. No further burial or protection works are planned for the AMITIÉ cable at this time.


It is requested that all vessels operating in this area keep their distance and avoid any works near the cable position. In view of the serious consequences resulting from damage to submarine cables, vessel operators should take special care when anchoring, fishing, mining, dredging, or engaging in underwater operations near areas where these cables may exist or have been reported to exist. In order to minimize the risk of such damage as much as possible, vessels should avoid any such activity at a minimum distance of 0.25 nautical mile, on either side of submarine cables.
 

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Exposed and Free Span - Greater Gabbard Offshore Wind Farm



Results of the Greater Gabbard OFTO export cable survey. The chart lists the changes to the exposures on the three export cables, on the inshore section between KP 3 and KP 5 with a free span remaining around KP 4. Between KP 36 and KP 38 there are some exposed sections as the cables enter the site. In addition, although listed as exposures on the chart, there are areas of shallow burial at KP10 and a cable exposure on the interconnector cable within the site.


Please find attached a chart showing the results of the Greater Gabbard OFTO export cable survey. The chart lists the changes to the exposures on the three export cables, on the inshore section between KP 3 and KP 5 with a free span remaining around KP 4. Between KP 36 and KP 38 there are some exposed sections as the cables enter the site. In addition, although listed as exposures on the chart, there are areas of shallow burial at KP10 and a cable exposure on the interconnector cable within the site.

 

The exposed/shallow burial areas are shown as the coloured dots on the cable route highlighted in a black box.  Equitix (Greater Gabbard OFTO) have asked that all Fishermen operate with caution when fishing anywhere on the cable route and particularly the areas that are shallow buried around KP10.’

 

Coordinates of exposed/shallow burial areas are shown on the attached chart.

 

The OFTO is updating its risk assessments to determine the extent of remedial measures that may be required. Equitix intend to provide an update on remediation after the risk assessment exercise is complete.’

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Seabed instrumentation frame deployments - South Stack Irish Sea



A seabed instrumentation frame with associated ground line and clump weight is deployed and will be recovered in a suitable weather / tidal window. The ballasted frame weighs around 370kg, measures approximately 1.5m x 1.5m x 1.5m and is connected to a 100kg clump weight and remotely actuated pop-up buoy via a 100m wire ground line. Note: two frames were deployed initially, but one of these has been recovered already.


Inside the Morlais demonstration zone the frame sits on the seabed in more than 30m of water, with no surface infrastructure such as buoys or markers. Vessels will be able to pass safely through the area and above the frames. Use of static or mobile benthic fishing gear in the immediate area should be avoided to avoid the risk of snagging.

 

The position listed here is as deployed.

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Seabed instrumentation frame deployment - Yell Sound



A seabed instrumentation frame has been temporarily deployed in Yell Sound and will be recovered in a suitable weather / tidal window. The ballasted instrumentation frame weighs around 370kg, measures approximately 1.5m high x 1.5m wide x 1.5m long  and is connected to a 100kg clump weight via a 100m wire ground line.


The frame sits on the seabed in water of at least 35m depth, with no surface infrastructure such as buoys or markers. Vessels will be able to pass safely through the area and above the frame. Use of static or mobile benthic fishing gear in the immediate area should be avoided to avoid the risk of snagging.

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Exposed power cable in free-span (up to 2 metres off the seabed)



A recent survey has detected a 17m long cable suspension (free-span), that is up to 2 metres high, on the BritNed Interconnector HVDC cable. This poses the risk of entrapment of trawling gear; all vessels fishing are advised to keep well clear. At its maximum height, the suspension is in the order of 1.5 - 2m clear of the seabed. BritNed are actively looking at remedial options, but in the meantime all fishing vessels are advised to give this location a wide berth.


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Dogger Bank A Boundary Buoy Installation - as installed locations



The Trinity House Buoy Installation Vessel, Galatea, has installed the Dogger Bank A boundary Demarcation Buoys in the Southern North Sea.


The 17 construction boundary demarcation buoys will remain in location until the windfarm construction activities have been completed and handed over to the Operations and Maintenance teams.

 

Once the permanent Aids to Navigation (AtoN) have been installed on the WTGs, Trinity House will approve the permanent AtoN and the boundary buoys will be removed.

 

If anyone finds a buoy that is off station or encounters a buoy location where it is not functioning or is missing, they should report this to the Dogger Bank Duty Marine Coordinator as soon as possible.

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R100 Telecom Cable Installation



Global Marine will be conducting the installation of the R100 telecommunications cables on behalf of British Telecommunications plc between May and September 2022. Timings are dependent upon weather and other operational conditions. Works will utilise the C S Sovereign and Normand Clipper vessels.


 

The vessels will be limited in manoeuvrability therefore, vessels working in the area should proceed with caution within 1NM from the cable ship during operations and all activity should remain clear 250m either side of the vessel, 500m corridor in total.

 

For a further breakdown of operations, please don't hesitate to get in touch.

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Redeployment (Floating LiDAR Redeployment) - Valorous



The redeployment of the Floating LiDAR system within the proposed Valorous Floating Offshore Wind Farm project site, following recovery in January 2022, has been successfully undertaken.


Redeployment and Operation Floating LiDAR System

 

To inform the engineering designs and Environmental Impact Assessments (EIA) for the proposed Valorous Floating Offshore Wind Farm (FLOW), a Floating LiDAR and associated mooring system has been successfully redeployed within the boundary of the proposed Valorous Floating Offshore Wind Farm (FLOW) project site.

 

The Floating LiDAR is maintained in position via appropriate mooring systems. The Floating LiDAR will remain at the location listed below for a 11-month period. Details of the device and relevant Aids to Navigation are provided within the attached NtM.

 

All vessels are requested to always maintain a safe distance (100m) from the Floating LiDAR.

 

The Floating LiDAR equipment will undergo regular scheduled maintenance during the operation period, further notice to mariners will be issued confirming the dates and maintenance activities

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Loss of Clump Weight - MarramWind



On the 6 May 2022 at 17:12 UTC, during sea acceptance trials for the MarramWind Site Investigation Surveys, a Sound Velocity Probe (SVP), Ultra Short Baseline (USBL) acoustic positioning system beacon and clump weight were lost. The lost equipment measures 100cm x 30 cm x 30cm. The depth of water where incident occurred is 125m. The Project is working to recover the object. Marine operators are advised to be aware of this object during any operations they undertake.


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Mooring and scientific equipment installed - Moray West offshore windfarm site



Mariners are advised that the University of Aberdeen has completed the installation of the moorings and equipment listed in the current notice. Moorings support sound recording equipment, and / or acoustic loggers that record echolocation clicks of dolphins and porpoises. Subsurface moorings extend no more than 3 m vertically from the seabed. The recording equipment and moorings will remain at these locations for 6 months and should be retrieved in October 2022.


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Guard Buoy Deployment - Berwick Bank OWF



Mariners are advised that a guard buoy associated with a bottom mounted ADCP device recording metocean data within the proposed Berwick Bank Wind Farm array area will be deployed.


This is part of a wider deployment of three guard buoys and associated equipment from October 2021. The guard buoy replaces one previously lost buoy in January 2022. It will be installed at the same location using the same methods. The Forth Warrior is the planned deployment vessel. A notification will also be provided on Kingfisher Information Services.

 

Expected arrival on site is 14th to 30th April 2022 with the works completed the same day where possible, weather conditions permitting. Therefore, we would like the validity period for this Notice to Mariners to be the 14th April 2022 – 31st October 2022 to allow for any eventualities during installation operations and to cover any ongoing O&M activities throughout the deployment period.

 

Please see the attachment pdf for further details. 

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Inter Array Cable Installation - Seagreen Site Boundary



On behalf of Seagreen Wind Energy Ltd, Seaway 7 will install and trench inter-array cabling between the wind turbine generator foundation structures and offshore sub-station platform within the Seagreen site boundary. Operations will commence with cable lay and trenching between wind turbine generator foundation structures, inter array cables will also be installed into the Offshore Substation Platform at a date to be confirmed. Two vessels will be involved in the operation.


Siem Stingray – This vessel will act as the Installation Support vessel, cable installation technicians will be deployed to the wind turbine generator foundation structures using the vessels’ motion compensated gangway system. The cable pulling equipment will be transferred onto the foundation structure and set up ready for the cables to be pulled into the structure and secured in the foundation basement. The motion compensated gangway system can be used for personnel and cargo transfers.

 

Seaway Phoenix – This vessel will lay the inter array cable between adjacent foundation structures. Once the cable has been pulled in and secured at the first foundation, the cable will be surface laid to the second foundation, pulled in and secured. On completion of this operation the cable will be trenched to a pre determined depth utilising a remotely operated trenching vehicle.

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Lost Grapnel equipment - Shetland HVDC



MV SIMA has been undertaking PLGR works as part of the Shetland HVDC subsea cable link project.  During operations part of the Grapnel hook used to recover debris from the seabed along the cable route was lost. The piece of equipment is diamond shaped and  measures 0.5 x 0.5 m and is approx 50mm thick. Marine operators are advised to be aware of this object during any operations they undertake.


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Site Investigation Surveys - MarramWind Offshore Wind Farm



MarramWind Offshore Wind Farm Site Investigation Campaign will commence from 11th April and run until the 30th November 2022 (including potential for weather delays/downtime).


The Survey vessels Fugro Venturer and Fugro Galaxy will be used as main the vessels to carry out the MarramWind site investigation campaign. At this stage this campaign relates to the Offshore Windfarm (OWF) array area only. Vessel turning areas will extend up to 1km beyond the survey lines.

 

The Site Investigation campaign will comprise of the following surveys for the provision of the data outline below.

  • Geophysical survey - consisting of a bathymetry survey using multi-beam echo sounding (MBES), hydro-acoustic positioning tracking USBL system, seabed mapping (side scan sonar (SSS), sub-bottom profiling (SBP), and seismic 2DUHR. The purpose of the geophysical survey is to identify the seabed and sub-seabed conditions within the survey area.
  • Geotechnical survey - a sampling and testing programme within the survey area to evaluate the nature and mechanical properties of the superficial seabed sediments. The survey programme includes vibro-coring and piezocone penetrometer testing (PCPT).
  • Environmental survey - to map the distribution and extent of marine benthic habitats. This will comprise a benthic sampling programme to collect drop-down video (DDV) footage and grab samples for the analysis of benthic fauna, particle size distribution, and sediment chemistry.

The MarramWind Offshore Wind Farm Site Investigation Campaign will commence from 11th April and run until the 30th November 2022 (including potential for weather delays/downtime).

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Completion of works - Moray East Offshore Transmission & Offshore Substation Platforms



The works associated with the Offshore Transmission (OfTI) and Offshore Substation Platforms (OSPs) were completed on the 13th January 2022. Overall care, custody and control of the works has been handed over to the Moray East Operations and Maintenance Team.  Please note, construction works associated with the Windfarm Infrastructure remain ongoing.  


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Deployment of a SeaWatch LiDAR Buoy (SWLB) - Awel Y Mor Offshore Wind Farm



Awel Y Mor Offshore Wind Farm Limited are planning the Deployment of a SeaWatch LiDAR Buoy (SWLB); this is a sea state measurement instrument (referred to as ‘the equipment’). The deployment location is within the UK Sector off the North Wales coast at Liverpool Bay. The equipment will be deployed within the Awel Y Mor Offshore wind farm array limits and will be deployed for approximately twelve months from March 2022.


The equipment will be located as close as reasonably practicable to the coordinates as provided within this Notice to Mariners.

 

The buoy was successfully deployed the 26th of March and the coordinates for the as laid main anchor position is updated.

 

Scheduled maintenance is planned in the autumn/winter of 2022, from September onwards.

 

Unforeseen maintenance may also be required. The mooring design is specific to each SWLB deployment and location. The equipment will be moored through a combination of steel chains, rope and rubber cord to approximately 3000 kg anchor weight at the seabed.

 

The equipment is an integrated Seawatch Wavescan buoy and ZX 300M LiDAR; the purpose of the equipment is to collect oceanographic and meteorological data using a single platform. The equipment is supplied and charged by an onboard power system which uses methanol fuel cells and solar panels to recharge onboard lead acid batteries.  

In order to minimise the risk to other sea users, the measures listed below will be adopted for this deployment:

 

The equipment will be equipped with a F1 (5) Y 20s light with 4-5 nautical mile range; the light will be mounted at the top of one of the masts, approximately 4 m above sea level.  

 

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Dropped object - Eastern Irish Sea



The seabed frame of the Mona metocean buoy has been lost in the Eastern Irish Sea. The last known location was: 53°40.268' N, 003°53.773' W. However, it seems likely that is has been dragged off location, potentially approx. 200m in a NW direction. The Mona buoy and accompanying chain have been recovered, but the seabed frame and approximately 30m of the combi rope groundline attached to the sea frame is lost. The Project is working to recover the object.


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Construction of Wind Farm - Neart na Gaoithe Offshore Wind Farm Limited



Neart na Gaoithe Offshore Wind Farm Limited (NnGOWL) will commence construction work for Neart na Gaoithe (NnG) Offshore Wind Farm, from the 9th August 2020, with the start of casing and pile installation operations on the wind farm site.


NnGOWL is developing the NnG Offshore Wind Farm, jointly owned by EDF Renewables and ESB, which is located in the outer Firth of Forth, Scotland. The NnG wind farm area is 15 km east off Fife Ness and 29 km from the East Lothian coastline and covers an area of 105 km2

The wind farm consists of 54 no. wind turbines (WTGs) and 2 no. Offshore Substation Platforms (OSPs), with a total capacity of approximately 45 0MW. Water depths across the offshore wind farm area generally range from 40 to 60 m below LAT. The generated power will be transmitted to the grid via two subsea export cable circuits which will reach landfall at Thorntonloch Beach, East Lothian, Scotland. Specific details and location of activities within the Wind Farm Area and Export Cable Corridor will be provided via subsequent notices as work progresses.

 

Buoyage

 

Five special markers are now in position:

 

Name Location

SP 1 - Special Mark - Fl Y 5s light character

56°18.180'N 02°12.075'W

SP 2 - Special Mark - Fl Y 5s light character

56°15.643'N 02°09.329'W

SP 3 - Special Mark - Fl Y 5s light character

56°12.294'N 02°15.796'W

SP 4 - Special Mark - Fl Y 5s light character

56°14.038'N 02°18.975'W

SP 5 - Special Mark - Fl Y 5s light character

56°18.924'N 02°18.951'W

 

Four cardinal buoys are due to be deployed the week commencing 16th March. Planned deployment locations

 

Name Location

NNG - North Cardinal - Quick (Q) white light character

56°20.425'N 02°14.617'W

NNG - East Cardinal - Q (3) 10 s white light character

56°14.329'N 02°08.558'W

NNG - South Cardinal - Q (6) + Long (L) FL 15 s white light character

56°12.294'N 02°09.760'W

NNG - West Cardinal - Q (9) 15 s white light character

56°17.057'N 02°21.084'W

 

A steel chain will be connected to each marker buoy, and the chain will be present through the water column, connected to an anchor placed on the seabed.

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Hywind Tampen installation



Activity: Installation of 11 floating wind turbines with anchor system on Hywind Tampen, in the area between Snorre, Visund and Gullfaks. Two export cables will also be installed from Hywind Tampen to Snorre and Gullfaks.


Period: From 1 April until the notice is canceled in Efs, autumn 2022. Precautionary area: (1)

 

Vessels: "Skandi Skansen" (MAXR6): Installation of anchor system 1 April - 1 June.

"Skandi Iceman" (LFMY): Towing and installation of floating wind turbines from approx. 15 May until autumn 2022.

 

Note: To avoid damage to unprotected equipment on the seabed and in the water column, as well as on fishing gear, all fishing with bottom gear within the precautionary area is to be avoided. The area will also be monitored by the Equinor Operations Center, which can be reached on VHF channel 14 or on telephone +47 55 14 32 78. Until completion, this will be an extended precautionary area. We will provide an updated Notice to Mariners regarding the permanent precautionary area that will be established when the wind farm installation is completed. Charts: 304, 307.

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Seagreen Offshore Wind Farm – Maintenance of Acoustic Monitoring Devices



Maintenance works will be undertaken on the five acoustic monitoring devices located in and around the Seagreen Offshore Wind Farm site.


Mariners are advised that maintenance works on the five acoustic monitoring devices in an around the boundaries of the Seagreen Offshore Wind Farm will be undertaken. The Marine Scotland Science vessel Alba na Mara plans to service the 3 monitors outside the site boundary this evening 14th of March. The 2 monitors inside the site boundary will be serviced tomorrow, 15th March. These acoustic monitoring devices collect real-time noise measurements for a period of 36 months. The devices will be inspected and maintained at least every four months.

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Seagreen Offshore Wind Farm –Installation & Commissioning of Wind Turbine Generators



Installation of wind turbine generators (WTG) will commence within the boundaries of the Seagreen offshore wind farm.


On behalf of Seagreen Wind Energy Ltd, MHI VestasOffshore Wind will commence the installation and commissioning of 114 wind turbine generators.There shall be four vessels utilised during thisoperation.The Jack up Vessel Wind Orca will be the main installation vessel. Wind Orca will transport the WTG components to site, jack up to the required height next to the foundation structure and install the WTG components.The Service Operation Vessel (SOV)Acta Centaurus will provide accommodation for the WTG commissioning technicians. Personnel will utilise the Acta Centaurus’s walk to work gangway system to access the WTG structures for commissioning activities.Two Crew Transfer Vessels(CTV’s), HST Euan and the HST Harri will support the above two vessels during installation and commissioning activities.The above vessels are expected to arrive at the Seagreen site on or around the 5thof December, WTG installation activities shall continue until late 2022.

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Deployment of Floating LiDAR Buoy - Berwick Bank Wind Farm



Mariners are advised that SSE Renewables will be deploying a floating LiDAR Buoy within the proposed Berwick Bank Wind Farm array area.


The LiDAR buoy will measure the wind conditions to provide valuable meteorological data to the offshore community that is needed for offshore wind resource characterisation

 

All locations referred to are outlined in Table 1 and displayed Figure 1 within the Notice to Mariners (provided as an attachment to this notice). These locations are all within the Berwick Bank Wind Farm (BBWF) in the outer Firth of Forth on the east coast of Scotland.

 

Expected arrival on site is 5th to 22nd November 2021 with the works completed the same day, weather conditions permitting. Therefore, we would like the validity period for this Notice to Mariners to be the 01 November 2021 – 30 November 2022 to allow for any eventualities during installation operations and also to cover any ongoing O&M activities throughout the deployment period.

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Seagreen Offshore Windfarm - Foundation Grout Installation



Grout will be installed in the Wind Turbine Generator foundation suction caisson voids within the Seagreen site boundary


On behalf of Seagreen Wind Energy Ltd, Seaway 7 will install grout to the Wind Turbine Generator foundation suction caisson voids within the Seagreen Site Boundary. The vessel EDT Hercules will transport the grouting mix to site and set up at the requisite foundation location. A grout hose will be connected to the suction caisson with the grouting mixture being injected into the caisson void. A remotely operated vehicle (ROV) will also be utilised in this operation.

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Carradale - Arran North and South Subsea Cables Charting Errors



The charted locations of the Carradale to Arran subsea electricity cables in the Kilbrannan Sound may be inaccurate and are being reviewed. Any corrections required will be issued as soon as possible. Mariners should be aware that the true cable locations may be up to ~300m from the presently charted positions. The location of this hazard notice is not indicative of any true cable location and is for information only.


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Seagreen Offshore Wind Farm - Scour Protection Installation



Subsea Scour Protection rock installation will commence on the Seagreen Offshore Windfarm foundation structures within the site boundary.


On behalf of Seagreen Wind Energy Ltd, Seaway 7 will install seabed scour protection rock to the foundation structures within the site boundary. The Flexible Fall Pipe Vessel (FFPV) Bravenes will transport and install the rock on the seabed using its flexible fall pipe system. This allows the scour protection to be installed with a high degree of accuracy. An ROV at the end of the fall pipe will be utilised to control the flow of rock to the seabed.

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Seagreen Offshore Windfarm - Deployment of a Guard Vessel



Due to construction activity commencing within the Seagreen development site a guard vessel will be deployed.


In conjunction with the commencement of wind turbine generator foundation installation activities, Seaway 7 will deploy a site Guard Vessel on behalf of Seagreen Wind Energy Ltd. The vessel will be deployed on or around the 01st October and will make six hourly VHF radio broadcasts containing information regarding the Seagreen development, including installation activity, safety zone information and site demarcation buoyage information. The first guard vessel to arrive will be the Renown FR246.

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Construction work - Seagreen Offshore Windfarm



On behalf of Seagreen Wind Energy, Seaway 7 will commence installation of 114 three legged suction caisson foundation structures. The foundations will be towed from Nigg,Cromarty Firth.On arrival at site the foundations will be installed by the Heavy Lift vessel Saipem 7000.The tug Nicobar will assist the Heavy Lift vessel with barge mooring operations.Foundation grouting operations will take place from the vessel EDT Hercules. Installation is expected to commence on or around 1st October 2021.


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Wave Buoy Deployment - London Array Offshore Wind Farm



A Wave Rider Buoy will be deployed onsite from 24th September until further notice as part of ongoing monitoring of offshore conditions to support operations. Spectrum Offshore will be engaged to deploy the buoy. Description of wave rider buoy: Yellow spherical buoy, transparent top dome with solar panels and flashing light. Weight: 197kg Size: 1.10m Diameter. The buoy is connected to a subsea weight on a surface line. Vessels are requested to always maintain a 250m clearance around the buoy.


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