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Metadata: 2008, Emu Ltd., Sheringham Shoal Offshore Wind Farm, Seabed and Sub-seabed Mapping Survey
Abstract:
The objective of the survey was to collect detailed bathymetry, shallow geology and seabed features data, to determine the best possible routing for the export power cables and for the construction and installation of the turbine foundations and infield cables within the windfarm site. The survey was carried out using the vessel RV Discovery between 1st March and 5th April 2008, utilising the following equipment: Multibeam Reson Seabat 8125 multibeam echo sounder Sidescan sonar Edgetech 4200 Sidescan Sonar USBL Sonardyne Scout USBL Pinger GeoAcoustics GeoPulse Pinger (3.5kHz) Boomer Applied Acoustics AA 200 boomer plate (2kHz) Hydrophone C-Products 8 element hydrophone streamer GPS Fugro Starfix DGPS GPS Leica 1230 RTK and PPK system A separate Field Report has been produced containing all operational and processing aspects of the work in Report NH0779 Seabed and Sub-seabed Mapping Survey, Field Report 08/J/1/02/1198/0767. All magnetometer survey work carried out has also been reported separately in Report NH0779 Magnetometer Survey of Geotechnical Borehole Sites at Sheringham Shoal Windfarm, No. 07/J/1/02/1137/0730 ver2. Prior to the seabed and sub-seabed mapping survey EMU Ltd completed a video survey at geotechnical borehole sites BH11, 13, 15, 16, 18 and 20. The objective of the survey was to establish if there was any Sabellaria reef at the above borehole locations. Sabellaria crust was identified at BH15 and BH 20 however this did not constitute a reef habitat. No other occurrences of Sabellaria were found at the remaining four borehole locations surveyed. Full survey results were reported in Report NH0779 Video Survey of Geotechnical Borehole Sites at Sheringham Shoal Windfarm, No. 07/1/02/1137/0731. Sabellaria reef was not identified during the Seabed and Sub-seabed Mapping Survey of the turbine area and cable corridor however this cannot be confirmed as no ground truth data was collected. A survey line spacing of 50m was used throughout the cable corridor with lines spaced at 48.5m throughout the windfarm site in order to tie in with the spacing of the turbines. Multibeam infill was run to achieve 100% data coverage where it was not achieved with the designed line plan. Cross lines in the routing corridor and windfarm site were also run. Water depths range from 0.8-24.5m and 11.5-23.5m below Chart Datum throughout the cable corridor and turbine area respectively. Throughout the turbine area sand waves and associated sand ripples run in a band from southeast to northwest. The remainder of the seabed sediments through site are relatively featureless gravelly, shelly SAND. Numerous contacts, boulders and fishing gear were found within the survey area and care should be taken to avoid these when trenching cables and preparing turbine foundations. No new wrecks or contacts of any significant size were located within the turbine area since the Gardline Survey was undertaken in May 2007 (NH0778). An area of weathered CHALK outcrops inshore on the cable corridor. Vibrocore data suggests this is “weak” which implies that trenching should be possible unless the presence of FLINT inclusions is found. Further geotechnical investigation would be needed to ascertain this conclusively. The remainder of the cable corridor sediment comprises sandy GRAVEL, shelly SAND and SAND. More sand waves are observed towards the northern extents of the cable corridor; care should be taken both here and within the turbine area if jack up rigs are in use due to steep gradients and the soft nature of this seabed type. In agreement with discoveries from the previous Gardline report, the presence of Botney Cut channel infills could provide difficulties for foundations of jack-up rigs due to the composition of sediments within these channels.It is recommended that further geotechnical investigations be carried out to ascertain the bearing capacity of such sediments now that the outcrop limits have been mapped. Other potential engineering difficulties may arise due to the presence of pockets of SAND and GRAVEL or BOULDERS within the Bolders Bank Formation.
Data holder:
Scira Offshore Energy Ltd
| Other details | ||
| Internal code | Internally assigned metadata identifier | 4631 |
| 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. | 2008, Emu Ltd., Sheringham Shoal Offshore Wind Farm, Seabed and Sub-seabed Mapping 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. | 41c2095d80b95275b39f3ef8ae236f44 |
| Resource Identifier | This is the code assigned by the data owner. | 3542 |
| 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 | 2008-03-01 |
| End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2008-04-05 |
| Vertical extent (min) | A positive or negative decimal number, for example, the shallowest depth recorded if subtidal, or, if intertidal, the lowest point recorded. | -24.5 |
| Vertical extent (max) | A positive or negative decimal number, for example, the deepest depth recorded if subtidal, or, if intertidal, the highest point recorded. | -1.5 |
| Vertical extent reference | This descibes the vertical coordinate reference system as referred to in the EPSG register of geodetic parameters. (epsg-registry.org) | Chart Datum at Cromer |
| Spatial resolution | This describes the spatial resolution of the dataset or the spatial limitations of the service. | 0.1 |
| Spatial resolution unit | This describes the unit of spatial resolution which for distance must be metres. | http://standards.iso.org/ittf/PubliclyAvailableStandards/ISO_19139_Schemas/resources/uom/gmxUom.xml#m |
| 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'. | notPlanned |
| Abstract | The abstract provides a clear and brief statement of the content of the resource. | The objective of the survey was to collect detailed bathymetry, shallow geology and seabed features data, to determine the best possible routing for the export power cables and for the construction and installation of the turbine foundations and infield cables within the windfarm site. The survey was carried out using the vessel RV Discovery between 1st March and 5th April 2008, utilising the following equipment: Multibeam Reson Seabat 8125 multibeam echo sounder Sidescan sonar Edgetech 4200 Sidescan Sonar USBL Sonardyne Scout USBL Pinger GeoAcoustics GeoPulse Pinger (3.5kHz) Boomer Applied Acoustics AA 200 boomer plate (2kHz) Hydrophone C-Products 8 element hydrophone streamer GPS Fugro Starfix DGPS GPS Leica 1230 RTK and PPK system A separate Field Report has been produced containing all operational and processing aspects of the work in Report NH0779 Seabed and Sub-seabed Mapping Survey, Field Report 08/J/1/02/1198/0767. All magnetometer survey work carried out has also been reported separately in Report NH0779 Magnetometer Survey of Geotechnical Borehole Sites at Sheringham Shoal Windfarm, No. 07/J/1/02/1137/0730 ver2. Prior to the seabed and sub-seabed mapping survey EMU Ltd completed a video survey at geotechnical borehole sites BH11, 13, 15, 16, 18 and 20. The objective of the survey was to establish if there was any Sabellaria reef at the above borehole locations. Sabellaria crust was identified at BH15 and BH 20 however this did not constitute a reef habitat. No other occurrences of Sabellaria were found at the remaining four borehole locations surveyed. Full survey results were reported in Report NH0779 Video Survey of Geotechnical Borehole Sites at Sheringham Shoal Windfarm, No. 07/1/02/1137/0731. Sabellaria reef was not identified during the Seabed and Sub-seabed Mapping Survey of the turbine area and cable corridor however this cannot be confirmed as no ground truth data was collected. A survey line spacing of 50m was used throughout the cable corridor with lines spaced at 48.5m throughout the windfarm site in order to tie in with the spacing of the turbines. Multibeam infill was run to achieve 100% data coverage where it was not achieved with the designed line plan. Cross lines in the routing corridor and windfarm site were also run. Water depths range from 0.8-24.5m and 11.5-23.5m below Chart Datum throughout the cable corridor and turbine area respectively. Throughout the turbine area sand waves and associated sand ripples run in a band from southeast to northwest. The remainder of the seabed sediments through site are relatively featureless gravelly, shelly SAND. Numerous contacts, boulders and fishing gear were found within the survey area and care should be taken to avoid these when trenching cables and preparing turbine foundations. No new wrecks or contacts of any significant size were located within the turbine area since the Gardline Survey was undertaken in May 2007 (NH0778). An area of weathered CHALK outcrops inshore on the cable corridor. Vibrocore data suggests this is “weak” which implies that trenching should be possible unless the presence of FLINT inclusions is found. Further geotechnical investigation would be needed to ascertain this conclusively. The remainder of the cable corridor sediment comprises sandy GRAVEL, shelly SAND and SAND. More sand waves are observed towards the northern extents of the cable corridor; care should be taken both here and within the turbine area if jack up rigs are in use due to steep gradients and the soft nature of this seabed type. In agreement with discoveries from the previous Gardline report, the presence of Botney Cut channel infills could provide difficulties for foundations of jack-up rigs due to the composition of sediments within these channels.It is recommended that further geotechnical investigations be carried out to ascertain the bearing capacity of such sediments now that the outcrop limits have been mapped. Other potential engineering difficulties may arise due to the presence of pockets of SAND and GRAVEL or BOULDERS within the Bolders Bank Formation. |
| Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | The full survey line plan was completed. Line spacing throughout the cable corridor was run at 50m with multibeam and pinger infill in shallow water depths to achieve 100% data coverage. Line spacing within the windfarm was alternated between 48.5m and 60m to optimise data coverage during changing weather conditions. Cross lines were run at 725m within the windfarm and 2000m along the cable corridor. It was decided due to timescales that a survey line directly over the optimum cable route would not be run at the end of contract. Instead a KP database was established for the production of alignment sheets using the two originally proposed cable routes. KP’s were setup with KP 0 inshore at landfall and increasing offshore towards the turbine sub-stations. This deviation from contract was agreed and implemented by the Client. |
| Additional information | This describes relevant references to the data e.g. reports, articles, websites plus other useful information not captured elsewhere. | Presentation type: digital representation of a primarily textual item (can contain illustrations also) Spatial representation type: 001 Origin: Emu Ltd |
| Related keywords | ||
| Keyword | 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 | Pre-Construction engineering | |
| 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 | Sedimentary structure | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Sediment age | |
| 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 | Seismic reflection | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Seismic refraction | |
| 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 | 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 | 53.175 |
| East | The eastern-most limit of the data resource in decimal degrees | 1.2244886798664 |
| South | The southern-most limit of the data resource in decimal degrees | 52.95 |
| West | The western-most limit of the data resource in decimal degrees | 1.0742216214591 |
| 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 | Scira Offshore Energy Ltd | |
| Position name | COWRIE uploader | |
| Phone | 0044(0) 203 204 3200 | |
| Fax | N/A | |
| Delivery point | One Kingdom Street, London, W2 6BD, United Kingdom | |
| info@scira.co.uk | ||
| URL | www.scira.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 | Scira Offshore Energy Ltd | |
| Position name | COWRIE uploader | |
| Phone | 0044(0) 203 204 3200 | |
| Fax | N/A | |
| Delivery point | One Kingdom Street, London, W2 6BD, United Kingdom | |
| info@scira.co.uk | ||
| URL | www.scira.co.uk | |
| Role | The originator is the person or organisation who created, collected or produced the resource. | originator |
| Organisation name | EMU Limited - Head Office | |
| Phone | +44 (0) 1489 860 050 | |
| Fax | +44 (0) 1489 860 051 | |
| Delivery point | 1 Mill Court, The Sawmills | |
| mail@emulimited.com | ||
| Resource locators | ||
| Locator URL | Web address (URL) that links to the resource | https://www.marinedataexchange.co.uk/details/1945/summary |
| Web address (URL) that links to the resource | https://www.marinedataexchange.co.uk | |
| Dataset constraints | ||
| 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 conditions apply |
| Available data formats | ||
| Data format | Format in which digital data can be provided for transfer | |
| 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. | 2008-01-01 |
| Date of creation | The date that the resource was created. | 2008-06-02 |
| 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. | 2009-06-30 |
| Metadata standard name | The name of the metadata standard used to create this metadata | MEDIN Discovery Metadata Standard |
| Metadata standard version | The version of the MEDIN Discovery Metadata Standard used to create the metadata record | Version 2.3.5 |