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Metadata: 2020, Fugro, Sheringham Shoal Offshore Wind Farm, Seabed Monitoring Survey
Abstract:
Equinor UK Ltd contracted Fugro GB Marine to undertake a Geophysical Survey of UK North Sea, located 23 KM off the North Norfolk coast. The survey comprised of the collection of multibeam bathymetry, multi beam backscatter data and side scan sonar data. The aims of the seabed survey 2020 were as follows; ? Acquisition of MBES, MBBS and SSS data around 88 wind turbine generators (WTG), 2 offshore substation (OSS) locations and export cable route (ECR) route; ? Identify sediment scouring, seabed contacts and features and cable free spanning across both survey sites; ? Compare survey results with 2018 survey findings and interpretations. The main findings arising from the geophysical survey data can be summarised as follows: ? Seabed depths on the main turbine array site (excluding monopiles and areas of rock dump) ranged from 14.54 m to 23.66 m below LAT; ? Seabed depths observed on the export cables ranged from 3.19 m to 24.40 m below LAT; ? A total of 24 exposures were identified; 15 located on the main site and 9 located on the export cable route; ? On the main site, the 15 exposures were located on the inter-array cable routes C2-D2, K8-J8, K7-J7, and adjacent to the WTG locations K8, J8, J7, I7, H6, G6, F6 and G5; four exposures showed evidence of freespan; ? One exposure was identified on the export cable route B in the southern end of the site; this was 9.6 m in length. Two further sets of exposures were observed in the export cable survey area, believed to relate to the Stratos Telecom cable and another possible unknown cable; ? In total 2056 SSS contacts were identified. Of those 801 were found on the main site and 1255 on the export cable route; ? Eight wrecks were identified on the wind farm site and the export cable route.
Data holder:
The Crown Estate
| Other details | ||
| Internal code | Internally assigned metadata identifier | 5265 |
| Title | The title is used to provide a brief and precise description of the dataset such as 'Date', 'Originating organisation/programme', 'Location' and 'Type of survey'. All acronyms and abbreviations should be reproduced in full. | 2020, Fugro, Sheringham Shoal Offshore Wind Farm, Seabed Monitoring Survey |
| File Identifier | The File Identifier is a code, preferably a GUID, that is globally unique and remains with the same metadata record even if the record is edited or transferred between portals or tools. | b3408a2d-0ef5-41ba-a471-f6b91c435f45 |
| Resource Identifier | This is the code assigned by the data owner. | G2467_SSS |
| Resource type | The resource type will likely be a dataset but could also be a series (collection of datasets with a common specification) or a service. | series |
| Start date | This describes the date the resource starts. This may only be the year if month and day are not known | 2020-11-24 |
| End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2020-12-29 |
| Frequency of updates | This describes the frequency with which the resource is modified or updated i.e. a monitoring programme that samples once per year has a frequency that is described as 'annually'. | asNeeded |
| Abstract | The abstract provides a clear and brief statement of the content of the resource. | Equinor UK Ltd contracted Fugro GB Marine to undertake a Geophysical Survey of UK North Sea, located 23 KM off the North Norfolk coast. The survey comprised of the collection of multibeam bathymetry, multi beam backscatter data and side scan sonar data. The aims of the seabed survey 2020 were as follows; ? Acquisition of MBES, MBBS and SSS data around 88 wind turbine generators (WTG), 2 offshore substation (OSS) locations and export cable route (ECR) route; ? Identify sediment scouring, seabed contacts and features and cable free spanning across both survey sites; ? Compare survey results with 2018 survey findings and interpretations. The main findings arising from the geophysical survey data can be summarised as follows: ? Seabed depths on the main turbine array site (excluding monopiles and areas of rock dump) ranged from 14.54 m to 23.66 m below LAT; ? Seabed depths observed on the export cables ranged from 3.19 m to 24.40 m below LAT; ? A total of 24 exposures were identified; 15 located on the main site and 9 located on the export cable route; ? On the main site, the 15 exposures were located on the inter-array cable routes C2-D2, K8-J8, K7-J7, and adjacent to the WTG locations K8, J8, J7, I7, H6, G6, F6 and G5; four exposures showed evidence of freespan; ? One exposure was identified on the export cable route B in the southern end of the site; this was 9.6 m in length. Two further sets of exposures were observed in the export cable survey area, believed to relate to the Stratos Telecom cable and another possible unknown cable; ? In total 2056 SSS contacts were identified. Of those 801 were found on the main site and 1255 on the export cable route; ? Eight wrecks were identified on the wind farm site and the export cable route. |
| Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | The Starfix primary positioning system worked well throughout the survey with no prolonged drop-outs. Vessel positioning was of high quality and within the limits specified in the contract. Further postprocessing within Fugro Starfix VBA Proc software ensured that all position data were within specification and accurately reduced to LAT. The bathymetry data collected were of good quality. Any obvious noise present in the data was removed and the remaining data were corrected for variations in positioning quality and corrected for sound velocity where required. Following processing, bathymetric sounding. standard deviation values were also assessed to ensure that data were consistent, vertically aligned and no erroneous soundings were present. Bathymetric differences were assessed between the winter 2020 survey and the autumn 2018 surveys. The checks were conducted on regions of flat seabed throughout the ECR and main array sites where no visible effects from construction or sand dune migration were evident. The rationale behind this was that these areas would be subject to the least change over time, meaning positional checks can be relied upon without the possibility of large amounts of natural change in the seabed skewing the results. In these regions, vertical differences were typically less than less than 0.15 m. This check provided further confidence that the datasets were correctly positioned and of high accuracy. SSS data were initially acquired using the Edgetech 4205 SSS (230/540/850 kHz), however, it was noticed that the data collected were excessively stripy and stretched. The Edgetech 4205 was therefore replaced with the Edgetech 4200 and the acquisition completed with it, although the same data quality issues were still partially present. This was assessed to be the results of strong currents in the area. Figure 4.1 and Figure 4.2 below show a comparison between data quality at low currents and data quality at high currents. The SSS data were deemed to be of overall good quality and fit for purpose. Detection of small objects such as fishing gear pots (less than 0.5 m in length), the ropes connecting them (less than 0.1 m in diameter) and cable exposures, were successfully achieved across the main site and on the export cable route. The presence of fishing gear and depth limitations in the nearshore area of the cable route area meant that full side scan sonar coverage could not be attained. However, only small gaps were present due to these limitations and were instead covered with multibeam backscatter. |
| Related keywords | ||
| Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | Side-scan sonar |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Bathymetry and Elevation | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Offshore Cable Corridor | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Renewable Energy Lease area | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Post-Construction monitoring | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Offshore Substation | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Marine Environmental Data and Information Network | |
| Keyword title | MEDIN | |
| Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | Marine Environmental Data and Information Network |
| Keyword title | MEDIN | |
| Geographical coverage | ||
| North | The northern-most limit of the data resource in decimal degrees | 53.182847 |
| East | The eastern-most limit of the data resource in decimal degrees | 1.231625 |
| South | The southern-most limit of the data resource in decimal degrees | 52.948708 |
| West | The western-most limit of the data resource in decimal degrees | 0.828491 |
| Responsible organisations | ||
| Role | The point of contact is person or organisation with responsibility for the creation and maintenance of the metadata for the resource. | pointOfContact |
| Organisation name | ABP Marine Environmental Research Ltd | |
| Phone | 02380711840 | |
| Delivery point | Quayside Suite,, Medina Chambers,, Town Quay | |
| Postal code | SO14 2AQ | |
| City | Southampton | |
| Country | United Kingdom | |
| enquiries@abpmer.co.uk | ||
| URL | http://www.abpmer.co.uk | |
| Role | The custodian is the person or organisation that accepts responsibility for the resource and ensures appropriate care and maintenance. If a dataset has been lodged with a Data Archive Centre for maintenance then this organisation is be entered here. | custodian |
| Organisation name | The Crown Estate | |
| Phone | +44 020 7851 5000 | |
| Delivery point | 1 St James Market | |
| Postal code | SW1Y 4AH | |
| City | London | |
| Country | United Kingdom | |
| enquiries@thecrownestate.co.uk | ||
| URL | http://www.thecrownestate.co.uk | |
| Role | The originator is the person or organisation who created, collected or produced the resource. | originator |
| Organisation name | Fugro | |
| Phone | +44 (0)2392 205500 | |
| Delivery point | Victory House,Trafalgar Wharf (Unit 16) | |
| Postal code | PO6 4PX | |
| City | Portsmouth | |
| Administrative area | Hampshire | |
| Country | United Kingdom | |
| unknown | ||
| URL | www.fugro.com | |
| Resource locators | ||
| Locator URL | Web address (URL) that links to the resource | https://www.marinedataexchange.co.uk/details/1986/summary |
| Web address (URL) that links to the resource | https://www.marinedataexchange.co.uk | |
| Dataset constraints | ||
| 20 Limitations on Public Access - Access constraints | intellectualPropertyRights | |
| 21 Conditions for Access and Use - Use limitation | This states any constraints on use of the data. Multiple conditions can be recorded for different parts of the data resource. If no conditions apply, then `No condtions apply` is recorded. This uses free text. | No restrictions |
| This states any constraints on use of the data. Multiple conditions can be recorded for different parts of the data resource. If no conditions apply, then `No condtions apply` is recorded. This uses free text. | No restrictions | |
| Version info | ||
| Date of publication | The publication date of the resource or if previously unpublished the date that the resource was made publicly available via the MEDIN network. | 2014-03-05 |
| Harvest date | The date which this record has been (re)harvested from the provider. | 2026-04-19 |
| Metadata date | The date when the content of this metadata record was last updated. | 2021-03-08 |
| Metadata standard name | The name of the metadata standard used to create this metadata | MEDIN Discovery Profile |
| Metadata standard version | The version of the MEDIN Discovery Metadata Standard used to create the metadata record | 2.3 |
| Metadata parent | G2467_SSS | |