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Metadata: 2001, Titan Environmental Surveys, Gunfleet Sands 1 and 2, Geophysical Survey
Abstract:
Titan Environmental Surveys Limited was commissioned to undertake a geophysical survey for the purpose of assessing the seabed and shallow sub-seabed conditions prior to the installation of an offshore wind farm on Gunfleet Sands, off the coast of Essex. Principal survey activities took place between 15th September 2001 and 19th October 2001. Bathymetric data was collected over the two areas specified in the contract, the wind farm area and cable route area. The data collected was via a single frequency survey echo sounder, all the bathymetric data was corrected for the motion of the vessel. The echo sounder was calibrated each day and the calibration verified by a velocity profile obtained from a temperature/salinity profile each day. All bathymetric depths are reduced to the level of Lowest Astronomical tide (LAT). The wind farm area consists of an elongated sand bank orientate southwest-northwest. Depths observed on the bank ranged on average from 0.5m LAT in the Southwest corner, to 7.5m LAT in the northeast corner. The seabed was of a gently undulating nature and showed signs of rippling in places during the first period of data acquisition but consequent to a period of poor weather conditions these areas of ripples were then not observed during the second period of data acquisition. In the north-western corner of the wind farm area the bathymetry shows signs of ridges on the seabed. These are due to the well cemented nature of the planar and cross-bedded sands which make up the seabed at this point and their ability to maintain steep faces on eroded sections rather than slump.
Data holder:
The Crown Estate
| Other details | ||
| Internal code | Internally assigned metadata identifier | 19150 |
| 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. | 2001, Titan Environmental Surveys, Gunfleet Sands 1 and 2, Geophysical Survey |
| Alternative title | The purpose of alternative title is to record any additional names by which the dataset may be known. | Geophysical 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. | 96ec1d88-a491-4025-904a-a6cd4cb09ba1 |
| Resource Identifier | This is the code assigned by the data owner. | TCE-473 |
| 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 | 2001-09-15 |
| End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2001-10-19 |
| 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. | Titan Environmental Surveys Limited was commissioned to undertake a geophysical survey for the purpose of assessing the seabed and shallow sub-seabed conditions prior to the installation of an offshore wind farm on Gunfleet Sands, off the coast of Essex. Principal survey activities took place between 15th September 2001 and 19th October 2001. Bathymetric data was collected over the two areas specified in the contract, the wind farm area and cable route area. The data collected was via a single frequency survey echo sounder, all the bathymetric data was corrected for the motion of the vessel. The echo sounder was calibrated each day and the calibration verified by a velocity profile obtained from a temperature/salinity profile each day. All bathymetric depths are reduced to the level of Lowest Astronomical tide (LAT). The wind farm area consists of an elongated sand bank orientate southwest-northwest. Depths observed on the bank ranged on average from 0.5m LAT in the Southwest corner, to 7.5m LAT in the northeast corner. The seabed was of a gently undulating nature and showed signs of rippling in places during the first period of data acquisition but consequent to a period of poor weather conditions these areas of ripples were then not observed during the second period of data acquisition. In the north-western corner of the wind farm area the bathymetry shows signs of ridges on the seabed. These are due to the well cemented nature of the planar and cross-bedded sands which make up the seabed at this point and their ability to maintain steep faces on eroded sections rather than slump. |
| Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | All times quoted in this report are in UTC, units of measurement refer to the metric system and all co-ordinates are referred to the Airy 1830 ellipsoid, Ordnance Survey Great Britain 1936 grid, as supplied by Hydrosearch Ltd. Positioning onboard the survey vessel was achieved using GPS techniques with the aim of achieving primary and secondary positioning to a horizontal accuracy of better than 3m. The RTK system was used as primary navigation and the General Lighthouse Authority (GLA) beacon system was used as secondary receiving corrections from North Foreland. All levels have been reduced to LAT (Lowest Astronomical Tide) using observed tides at Clacton Pier. The tide gauge was installed by Titan Environmental Surveys Ltd. and calibrated by a series of tide watches. Details of which are provided in Appendix D. LAT and Chart Datum are coincident at the survey area. The relationship between Chart Datum relative to MSL (Mean Sea Level) is –2.29m. |
| Additional information | This describes relevant references to the data e.g. reports, articles, websites plus other useful information not captured elsewhere. | Geophysical data shall only be downloadable with prior permission of DONG Energy Origin: Titan Environmental Surveys Limited |
| 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 | Seismic reflection | |
| 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 | Magnetics | |
| 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 | 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 | Elevation | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Geology | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Oceanographic geographical features | |
| Geographical coverage | ||
| North | The northern-most limit of the data resource in decimal degrees | 51.752910014735 |
| East | The eastern-most limit of the data resource in decimal degrees | 1.2609909324585 |
| South | The southern-most limit of the data resource in decimal degrees | 51.710526813632 |
| West | The western-most limit of the data resource in decimal degrees | 1.1822141549296 |
| 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 | Orsted | |
| info@orsted.com | ||
| 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 | Titan Environmental Surveys Ltd (now Gardline) | |
| environmental.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 | Orsted | |
| info@orsted.com | ||
| Resource locators | ||
| Locator URL | Web address (URL) that links to the resource | https://www.marinedataexchange.co.uk/details/TCE-473/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 |
| 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. | 2026-09-10 |
| 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 |