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Metadata: 2004-2005, HydroSoil, Gardline Geosciences & Osiris Projects, London Array, Ground Investigation Survey
Abstract:
London Array Limited commissioned geophysical and geotechnical surveys for the proposed offshore wind farm in the outer Thames Estuary, comprising up to 300 turbines and a 46.5km buried electrical cable connection. Conducted by Osiris Projects and Gardline Geosciences, with oversight by Hydro Soil Services, the surveys employed sonar, vibrocores, Cone Penetration Tests, bathymetric methods, physical sediment sampling, and analysis of geophysical charts and reports to assess seabed conditions and recommend cable burial strategies. Findings revealed variable seabed compositions, sediment mobility, biogenic gas presence, and multiple hazards, including magnetic anomalies and debris. Recommended burial depths range from 0.6m to 2.0m, with jet trenching or ploughing for unconsolidated sediments and pretrenching for stiff clay, emphasizing the importance of detailed risk assessment, site-specific geological considerations, and robust burial protection to mitigate threats such as fishing and anchoring.
Data holder:
The Crown Estate
| Other details | ||
| Internal code | Internally assigned metadata identifier | 19128 |
| 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, HydroSoil, Gardline Geosciences & Osiris Projects, London Array, Ground Investigation Survey |
| Alternative title | The purpose of alternative title is to record any additional names by which the dataset may be known. | Ground Investigation 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. | 93f9fcbc-ada7-4fe4-8738-2d0b4511838f |
| Resource Identifier | This is the code assigned by the data owner. | TCE-976 |
| 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 | 2004-03-31 |
| End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2005-03-30 |
| 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. | London Array Limited commissioned geophysical and geotechnical surveys for the proposed offshore wind farm in the outer Thames Estuary, comprising up to 300 turbines and a 46.5km buried electrical cable connection. Conducted by Osiris Projects and Gardline Geosciences, with oversight by Hydro Soil Services, the surveys employed sonar, vibrocores, Cone Penetration Tests, bathymetric methods, physical sediment sampling, and analysis of geophysical charts and reports to assess seabed conditions and recommend cable burial strategies. Findings revealed variable seabed compositions, sediment mobility, biogenic gas presence, and multiple hazards, including magnetic anomalies and debris. Recommended burial depths range from 0.6m to 2.0m, with jet trenching or ploughing for unconsolidated sediments and pretrenching for stiff clay, emphasizing the importance of detailed risk assessment, site-specific geological considerations, and robust burial protection to mitigate threats such as fishing and anchoring. |
| Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | Osiris Survey undertook a geophysical survey of the proposed route between April and August 2004. The Osiris survey comprised bathymetric, side scan sonar, magnetometer and sub-seabed profiling. The results are presented in the alignment chartsRef1. Gardline undertook a geotechnical survey with vibrocores and Cone Penetration Tests (CPTs). A total 32 vibrocores and 24 CPTs were applicable to the proposed cable route. Full details of the geophysical and geotechnical surveys carried out are given in the Gardline reportsRef2. Following completion of the fieldwork, a programme of laboratory testing was undertaken. The testing relevant to the trenching comprised: Particle Size Distribution (PSD) analysis Moisture Content Atterberg Limit determinations Hand Shear Vanes The results of the geophysical and geotechnical surveys have been correlated and the route has been divided into sections dependant upon seabed features and geology. These sections are detailed in the Cable Route Summary Tables in Appendix A. The tables detail the seabed features and the shallow geology as well as highlighting any other features that may pose a hazard to trenching such as magnetic anomalies and sonar contacts. |
| Additional information | This describes relevant references to the data e.g. reports, articles, websites plus other useful information not captured elsewhere. | Origin: Gardline Geosciences |
| Related keywords | ||
| Keyword | 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 | Geotechnics | |
| 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 | Geology | |
| Geographical coverage | ||
| North | The northern-most limit of the data resource in decimal degrees | 51.765532097142 |
| East | The eastern-most limit of the data resource in decimal degrees | 1.6758136933659 |
| South | The southern-most limit of the data resource in decimal degrees | 51.565039353112 |
| West | The western-most limit of the data resource in decimal degrees | 1.3487921720695 |
| 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 | The Crown Estate | |
| enquiries@thecrownestate.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 | |
| enquiries@thecrownestate.co.uk | ||
| Role | The originator is the person or organisation who created, collected or produced the resource. | originator |
| Organisation name | Gardline Geosciences Ltd | |
| Phone | 01962 868626 | |
| geotechnical.web@gardline.com | ||
| 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 | |
| support@rwe.com | ||
| Resource locators | ||
| Locator URL | Web address (URL) that links to the resource | https://www.marinedataexchange.co.uk/details/TCE-976/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. | 2022-05-23 |
| Date of creation | The date that the resource was created. | 2005-01-01 |
| Harvest date | The date which this record has been (re)harvested from the provider. | 2026-09-27 |
| Metadata date | The date when the content of this metadata record was last updated. | 2026-09-01 |
| 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 |