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The London Array 2 Offshore Wind Farm is located in the outer Thames Estuary more than 20 km from the Essex coast. London Array 2 covers an area of approximately 15 x 7 km, consisting of 41 sites with the dimensions 150 x 150 m. Seabed sediments across the area generally comprise of sands and gravel with sand waves occurring extensively across large parts of the survey area. The seabed topography is dominated by the Long Sand and Kentish Knock sand banks which extend south-west to north-east through the project site. The seabed is characterised by localised current induced sediment bed forms. Sand waves of up to 5 m high occur of the flanks and crests of the aforementioned two major sand banks. Water depths within the project site vary between nominally 0 m and 23.5 m below Lowest Astronomical Tide (LAT). A comprehensive bathymetrical and geophysical survey of each planned turbine site was conducted by MMT in 2012. The reports summarise the conditions within the survey sites with regards to; bathymetry and seabed or buried features (e.g. obstacles, manmade targets and cables) detected during the survey. - Side Scan Sonar Data - Magnetometer Data - Multichannel Seismic Data The results from the bathymetrical and geophysical survey are presented within the enclosed report and appendices. The report provides information of the survey performance, instrumentation and processing stages of the work, together with summaries of the survey results.
DONG Energy Power (UK) Ltd
No limitations.
Other details | ||
Internal code | Internally assigned metadata identifier | 7819 |
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. | 2012, MMT, London Array Offshore Wind Farm - Phase 2, 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. | e4b07c62646cba170e3b40b504fe0d46 |
Resource Identifier | This is the code assigned by the data owner. | LAL02-531642798 |
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 | 2012-04-18 |
End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2012-06-30 |
Spatial resolution | This describes the spatial resolution of the dataset or the spatial limitations of the service. | inapplicable |
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 London Array 2 Offshore Wind Farm is located in the outer Thames Estuary more than 20 km from the Essex coast. London Array 2 covers an area of approximately 15 x 7 km, consisting of 41 sites with the dimensions 150 x 150 m. Seabed sediments across the area generally comprise of sands and gravel with sand waves occurring extensively across large parts of the survey area. The seabed topography is dominated by the Long Sand and Kentish Knock sand banks which extend south-west to north-east through the project site. The seabed is characterised by localised current induced sediment bed forms. Sand waves of up to 5 m high occur of the flanks and crests of the aforementioned two major sand banks. Water depths within the project site vary between nominally 0 m and 23.5 m below Lowest Astronomical Tide (LAT). A comprehensive bathymetrical and geophysical survey of each planned turbine site was conducted by MMT in 2012. The reports summarise the conditions within the survey sites with regards to; bathymetry and seabed or buried features (e.g. obstacles, manmade targets and cables) detected during the survey. - Side Scan Sonar Data - Magnetometer Data - Multichannel Seismic Data The results from the bathymetrical and geophysical survey are presented within the enclosed report and appendices. The report provides information of the survey performance, instrumentation and processing stages of the work, together with summaries of the survey results. |
Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | Vertical Datum: GNSS (Global Navigation Satellite System)-tide was used to correct the bathymetry data to the defined vertical datum, LAT. The GNSS-tide is obtained by post-processing GNSS-data collected by an Applanix PosMV 320 system. The GNSS-data is post-processed in the software POSPac MMS. Both the POS MV and POSPac MMS are developed by Applanix. The output from POSPac is ellipsoidal heights with accuracies of 5 cm RMS and are corrected for motion and referenced to the multibeam reference point. By incorporating the VORF model into the process the heights will be referenced to LAT. The VORF model is developed for the UK area and has accuracy within a decimetre. Comparisons with the closest water-level station have been done to ensure that the data is levelled correctly. This tidal reduction methodology encompasses all vertical movement of the vessel, including tidal effect and vessel movement due to waves and currents. The short variations in height are identified as heave and the long variations as tide. This methodology is very robust since it is not limited by the filter settings defined online and provides very good results in complicated mixed wave and swell patterns. The vessel navigation is exported into a post processed format, SBET (Smoothed Best Estimated Trajectory) that is then applied onto the MBES-data. The methodology has proven to be very accurate as it accounts for any changes in height caused by changes in atmospheric pressure, storm surge, squat, loading or any other effect not accounted for in a tidal prediction. Time Datum: UTC will be used on all survey systems on board the vessel. The synchronisation of the vesselâ??s onboard system is governed by the Pulse Per Second (PPS) and ZDA time string issued by the primary positioning system. All displays, overlays and logbooks will be annotated in UTC. Calibration: The Mobilisation and Calibration Report (101124-DON-MMT-ATR-PRO-UHRS002) details the calibrations and verifications performed for the project. The mobilisation and calibration procedure is considered a quality calibration test of all survey instruments, according to ISO 9001:2008 (SS-EN ISO 9001:2008 - section 7.6 - Control of monitoring and measuring equipment). |
Related keywords | ||
Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | Marine Environmental Data and Information Network |
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 | Geological sample magnetic, electrical and acoustic properties | |
General subject area(s) associated with the resource, uses multiple controlled vocabularies | Construction monitoring | |
General subject area(s) associated with the resource, uses multiple controlled vocabularies | Renewable Energy Lease area | |
Geographical coverage | ||
North | The northern-most limit of the data resource in decimal degrees | 51.6478 |
East | The eastern-most limit of the data resource in decimal degrees | 1.6769 |
South | The southern-most limit of the data resource in decimal degrees | 51.5215 |
West | The western-most limit of the data resource in decimal degrees | 1.3693 |
Regional sea | Southern North Sea | |
North Sea | ||
bathybenthic | ||
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 | DONG Energy Power (UK) Ltd | |
Position name | Data Manager | |
Role | The originator is the person or organisation who created, collected or produced the resource. | originator |
Organisation name | DONG Energy Power (UK) Ltd | |
Position name | Data Manager | |
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 | DONG Energy Power (UK) Ltd | |
Position name | Data Manager | |
Resource locators | ||
Locator URL | Web address (URL) that links to the resource | https://www.marinedataexchange.co.uk/details/1015/summary |
Web address (URL) that links to the resource | https://www.marinedataexchange.co.uk | |
Dataset constraints | ||
20 Limitations on Public Access - Access constraints | ISO restriction code chosen from ISO 19115-1 Codelist | otherRestrictions |
20 Limitations on Public Access – Other constraints | Any restriction on the use of the resource such as the need to agree to certain licence conditions. | No limitations. |
21 Conditions for Access and Use - Use limitation | Any restrictions imposed on accessing the resource such as the need to agree to certain licence conditions. | Available for use providing the originators are acknowledged in any publications produced. |
Available data formats | ||
Data format | Format in which digital data can be provided for transfer | Documents |
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. | 2012-09-27 |
Metadata date | The date when the content of this metadata record was last updated. | 2014-05-08 |
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 | 2.3.7 |
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