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Metadata: 2004 - 2005, CMACS, Greater Gabbard, Benthic Sampling Survey
Abstract:
Centre for Marine and Coastal Studies Ltd (CMACS) undertook a benthic grab sampling survey in the outer Thames estuary between November 2004 and May 2005 to inform the environmental impact assessment for the proposed Greater Gabbard offshore wind farm. The grab sampling is part of a suite of offshore ecological survey work also comprising drop down camera survey, beam and otter trawling which will together provide an benthic ecological characterisation of the proposed development site.
Data holder:
The Crown Estate
| Other details | ||
| Internal code | Internally assigned metadata identifier | 39791 |
| 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. | 2004 - 2005, CMACS, Greater Gabbard, Benthic Sampling Survey |
| Alternative title | The purpose of alternative title is to record any additional names by which the dataset may be known. | Benthic Sampling 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. | 913b40c2-1008-4a34-be46-7b1bf3baedff |
| Resource Identifier | This is the code assigned by the data owner. | TCE-399 |
| 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 | 2004-11-01 |
| End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2005-05-31 |
| 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. | Centre for Marine and Coastal Studies Ltd (CMACS) undertook a benthic grab sampling survey in the outer Thames estuary between November 2004 and May 2005 to inform the environmental impact assessment for the proposed Greater Gabbard offshore wind farm. The grab sampling is part of a suite of offshore ecological survey work also comprising drop down camera survey, beam and otter trawling which will together provide an benthic ecological characterisation of the proposed development site. |
| Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | At the request of the wind farm developer, the Galloper Bank sites were prioritised in 2004. All sites, including near-field and mid-field characterisation sites, were visited and samples were successfully obtained from 26 of the 31 Galloper sites. A grab sampler was deployed at least three times at each site to obtain a satisfactory biological sample, with a minimum of 5 litres of material before sieving. Where sampling was unsuccessful, the seabed typically consisted of hard clay, identified by clay streaks on the grab jaws, with or without a thin veneer of sand or gravel. At the Inner Gabbard Bank, 32 of the 40 sites were visited in 2004. Following an unsuccessful grab attempt at Site 48, the vessel’s hands-free grab capture mechanism was damaged during retrieval. Increasing winds and swell subsequently prevented further survey work, and operations were halted so that repairs could be carried out ashore. It was later agreed that the remaining sites on the Gabbard Bank, together with control sites to the north and south (15 sites in total), would be surveyed the following spring alongside the cable route survey. Of the 76 proposed grab sites, 62 were visited during the 2004 survey. Samples were successfully collected at 48 sites, while 14 sites yielded insufficient material for a suitable sample. In 2005, the proposed turbine array boundaries on the Gabbard and Galloper banks were revised and additional grab sites were included to cover the new areas. Sites that had been missed during the 2004 survey but were considered priorities for sampling were revisited in 2005, although samples could not be obtained at sites where collection had been unsuccessful in 2004. These sites were located in the middle of the Gabbard Bank and at the northern and southern control areas. Samples were successfully obtained from 49 sites in 2005, including two sites where only enough material was collected for chemical analysis. Samples could not be obtained from 13 sites. Site 3 was relocated after the grab failed to recover material from the original location. The coverage of the grab survey is summarised in Figure 1. The locations of beam trawls and otter trawls are shown in Figure 2. No trawl data were obtained from Site 62 (Inner Gabbard Bank) because the trawl was lost after becoming snagged. It is believed that the trawl became buried in the face of a sandwave, causing the bridle to snap. |
| Additional information | This describes relevant references to the data e.g. reports, articles, websites plus other useful information not captured elsewhere. | Origin: Centre for Marine and Coastal Studies Ltd |
| Related keywords | ||
| Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | Concentration of other organic contaminants in sediment samples |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Fish abundance in water bodies | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Sediment grain size parameters | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Consenting | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Agreement for Lease Area | |
| 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 | Habitats and biotopes | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Soil | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Species distribution | |
| Geographical coverage | ||
| North | The northern-most limit of the data resource in decimal degrees | 51.9829312026 |
| East | The eastern-most limit of the data resource in decimal degrees | 2.0098946908007 |
| South | The southern-most limit of the data resource in decimal degrees | 51.730523678112 |
| West | The western-most limit of the data resource in decimal degrees | 1.8447107824667 |
| Responsible organisations | ||
| 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 | |
| enquiries@thecrownestate.co.uk | ||
| Role | The originator is the person or organisation who created, collected or produced the resource. | originator |
| Organisation name | Centre of Marine and Coastal Studies | |
| Phone | 01513277177 | |
| info@cmacsltd.co.uk | ||
| Role | The distributor is the person or organisation that distributes the resource. | distributor |
| Organisation name | The Crown Estate | |
| Phone | +44 020 7851 5000 | |
| enquiries@thecrownestate.co.uk | ||
| Role | The owner is the person or organisation that owns the resource. | owner |
| Organisation name | RWE Renewables UK Swindon Limited | |
| support@rwe.com | ||
| 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 | SSE Renewables | |
| Individual name | Kirstanne McDowall | |
| Position name | Community Liaison Manager | |
| Phone | +44(0)141 224 7569 | |
| kirstanne.mcdowall@sse.com | ||
| Resource locators | ||
| Locator URL | Web address (URL) that links to the resource | https://www.marinedataexchange.co.uk/details/TCE-399/summary |
| Web address (URL) that links to the resource | https://www.marinedataexchange.co.uk | |
| Dataset constraints | ||
| 20.1 Limitations on Public Access - Access constraints | This states `otherRestrictions` from ISO vocabulary RestrictionCode and is an INSPIRE/GEMINI requirement. | otherRestrictions |
| 20.2 Limitations on Public Access - Other constraints | There will be no limitations when published on the Marine Data Exchange | |
| 21.1 Conditions for Access and Use - Use constraints | This states `otherRestrictions` from ISO vocabulary RestrictionCode and is an INSPIRE/GEMINI requirement. | otherRestrictions |
| 21.2 Conditions for Access and Use - Other constraints | 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. | Data Must be used in accordance to the Marine Data Exchange's Terms of Use: https://www.marinedataexchange.co.uk/content/info/terms-of-use |
| 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. | 2021-05-17 |
| Date of creation | The date that the resource was created. | 2004-11-26 |
| Harvest date | The date which this record has been (re)harvested from the provider. | 2026-08-08 |
| Metadata date | The date when the content of this metadata record was last updated. | 2026-08-04 |
| Metadata standard name | The name of the metadata standard used to create this metadata | MEDIN |
| Metadata standard version | The version of the MEDIN Discovery Metadata Standard used to create the metadata record | 3.1.2 |