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Metadata: 2014, Wessex Archaeology, Dudgeon, Geophysical Assessment
Abstract:
Wessex Archaeology was commissioned by Royal Haskoning DHV on behalf of Dudgeon Offshore Wind Limited (DOW) to conduct an archaeological assessment of geophysical data obtained over the site of the Dudgeon Offshore Wind Farm and its associated export cable route. An archaeological interpretation and assessment of sidescan sonar, magnetometer and multibeam bathymetry data was undertaken. For the purpose of reporting, the study area was separated into the Offshore Wind Farm and the export Cable Route. The Dudgeon Offshore Wind Farm site is situated approximately 32km offshore of Cromer on the north Norfolk coast. The Offshore Wind Farm comprises 67 wind turbine locations and their associated Inter-array cables. A 500m corridor for the Inter-array Cables and a 50m radius buffer zone for each of the wind turbine locations were assessed. The export cable route will make landfall as Weybourne Hope, approximately 5km west of Sheringham; with a 500m corridor being assessed.
Data holder:
The Crown Estate
| Other details | ||
| Internal code | Internally assigned metadata identifier | 19247 |
| 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. | 2014, Wessex Archaeology, Dudgeon, Geophysical Assessment |
| Alternative title | The purpose of alternative title is to record any additional names by which the dataset may be known. | Geophysical Assessment |
| 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. | 80b8e5f1-7bab-415b-aa0e-f4590984b782 |
| Resource Identifier | This is the code assigned by the data owner. | TCE-315 |
| 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 | 2014-07-01 |
| End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2014-07-31 |
| 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'. | asNeeded |
| Abstract | The abstract provides a clear and brief statement of the content of the resource. | Wessex Archaeology was commissioned by Royal Haskoning DHV on behalf of Dudgeon Offshore Wind Limited (DOW) to conduct an archaeological assessment of geophysical data obtained over the site of the Dudgeon Offshore Wind Farm and its associated export cable route. An archaeological interpretation and assessment of sidescan sonar, magnetometer and multibeam bathymetry data was undertaken. For the purpose of reporting, the study area was separated into the Offshore Wind Farm and the export Cable Route. The Dudgeon Offshore Wind Farm site is situated approximately 32km offshore of Cromer on the north Norfolk coast. The Offshore Wind Farm comprises 67 wind turbine locations and their associated Inter-array cables. A 500m corridor for the Inter-array Cables and a 50m radius buffer zone for each of the wind turbine locations were assessed. The export cable route will make landfall as Weybourne Hope, approximately 5km west of Sheringham; with a 500m corridor being assessed. |
| Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | The sidescan sonar data were processed by WA using Coda Geosurvey software. This allowed the data to be replayed with various gain settings in order to optimise the quality of the images. The data were initially scanned to give an understanding of the geological nature of the area and were then interpreted for any objects of possible anthropogenic origin. This involves creating a database of anomalies within Coda by tagging individual features of possible archaeological potential, recording their positions and dimensions, and acquiring an image of each anomaly for future reference. A mosaic of the sidescan sonar data is produced during the data processing to assess the quality of the sonar towfish positioning. This allows the position of anomalies to be checked between different survey lines and for the layback values to be further refined if necessary. The navigation information was contained within the data files themselves and errors on positioning are +/-5m. The magnetometer data were processed by WA using Geometrics MagPick software in order to identify any discrete magnetic contacts which could represent buried metallic debris or structures such as wrecks. The software enables both visualisation of individual lines of data and gridding of data to produce a magnetic anomaly map. Smoothed averages of the data were first calculated, and then subtracted from the raw data values in order to reduce the effect of natural variations in the magnetic field such as changes in geology or water depth. The 0.2m cell size of the multibeam bathymetry data was too small for the quality of the data with some data holes apparent and collection artefacts very apparent. WA gridded the provided data with a coarser resolution of 1m and made digital terrain maps using IVS Fledermaus software. These data were examined for evidence of anomalies identified in the sidescan data. The initial interpretation of the geophysical data sets is conducted independently of each other. This inevitably leads to the possibility of any one object being the cause of numerous anomalies in different datasets and apparently overstating the number of archaeological features in the area. To address this fact, the anomalies were grouped together. This allows one ID number to be assigned to a single object for which there may be, for example, a bathymetric anomaly and multiple sidescan sonar anomalies. Once all the geophysical anomalies have been grouped, a discrimination flag is added to the record in order to discriminate against those which are not thought to be of an archaeological concern. The sidescan, magnetic and bathymetry anomalies were grouped together where they correlate. UKHO records that fall within the target review areas were included and grouped where appropriate. This produced the final gazetteer of features. These features are numbered with a WA ID which takes the form of a 70,000 number series. Anomalies that were identified during the previous phases of work (WA, 2009a, and b) were included and grouped where appropriate and have retained their original 7000 numbers. Due to the better quality of the most recent datasets, those anomalies identified during both the current and previous phases of work have had their locations updated. It must be noted that the current data set is of a higher quality than those used during previous reports (WA, 2009a and b). The small 35m range of the sidescan sonar dataset allows for higher resolution and therefore identification of smaller anomalies that may not have been identified during the previous phase. The recent magnetometer dataset as been acquired at UXO standard and as such at a much higher specification compared to previous surveys and as such an increased number of anomalies have been identified during this assessment. |
| 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 | Seismic refraction | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Marine archaeology | |
| 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 | Pre-Construction monitoring | |
| 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 | Offshore Cable Corridor | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Elevation | |
| Geographical coverage | ||
| North | The northern-most limit of the data resource in decimal degrees | 53.284 |
| East | The eastern-most limit of the data resource in decimal degrees | 1.4544 |
| South | The southern-most limit of the data resource in decimal degrees | 52.6255 |
| West | The western-most limit of the data resource in decimal degrees | 0.7787 |
| 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 | |
| Phone | +44 023 8071 1840 | |
| enquiries@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 | |
| enquiries@thecrownestate.co.uk | ||
| Role | The originator is the person or organisation who created, collected or produced the resource. | originator |
| Organisation name | Wessex Archaeology | |
| Individual name | Euan McNeill | |
| Position name | Director, Coastal & Marine | |
| Phone | 01722 326867 | |
| info@wessexarch.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 | Orsted | |
| Customer-questions@orsted.com | ||
| Resource locators | ||
| Locator URL | Web address (URL) that links to the resource | https://www.marinedataexchange.co.uk/details/TCE-315/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. | 2021-12-03 |
| 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. | 2026-03-17 |
| 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 |