c6b6ffc7-7eda-40af-86da-be21493df30c English series series 2026-03-27T09:35:29 MEDIN 3.1.2 geoscientificInformation oceans Sedimentary structure SeaDataNet Parameter Discovery Vocabulary 2023-12-12 revision Geological sample density SeaDataNet Parameter Discovery Vocabulary 2023-12-12 revision Geotechnics SeaDataNet Parameter Discovery Vocabulary 2023-12-12 revision Pre-Construction engineering The Crown Estate Renewable Energy Development Phases 2012-05-15 revision Renewable Energy Lease area The Crown Estate Renewable Energy Development Areas 2012-05-15 revision Offshore Cable Corridor The Crown Estate Renewable Energy Development Areas 2012-05-15 revision Soil GEMET - INSPIRE themes, version 1.0 2009-07-31 revision Elevation GEMET - INSPIRE themes, version 1.0 2009-07-31 revision SeaDataNet sea areas 2012-11-07 revision Irish Sea and St. George's Channel SeaVoX Vertical Co-ordinate Coverages 2020-05-21 revision soil and sediment 2013-09-20T00:00:00 2013-10-05T00:00:00 -3.852 -2.7561 53.7316 54.2483 3.00 48.00 TCE-2221 Marine Data Exchange 2013, N-Sea Survey BV, Walney Extension, Geotechnical Investigation Geotechnical Investigation 2021-05-17T14:10:44 publication English N-Sea Survey B.V. (hereinafter referred to as N-Sea) was awarded the contract by DONG Energy Walney Extension (UK) Ltd. to undertake geotechnical sampling investigations, consisting of CPTs (cone penetration tests) and vibrocores at specified locations. Sixty six (66) locations were identified by DONG: 17 within the WOW03 site and 49 along the proposed export cable route. Geotechnical services were provided by specialist subcontractor Marine Sampling Holland (MSH) who provided the Manta CPT, hydraulic vibrocore equipment and four operators. Fieldwork operations were undertaken from the 32 m multicat, M.P.R. 3, which was chartered from Marine Projects Rotterdam. A total of 79 CPTs (including 13 repeats) and 76 vibrocores (incl. 10 repeats) were completed between 20 September and 5 October 2013. The approximate water depths ranged from -3 m LAT near shore to +48 m LAT at the WOW03 site. Various seabed features, including mega ripples and sand waves, were present on the seabed. There will be no limitations when published on the Marine Data Exchange otherRestrictions 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 otherRestrictions The Crown Estate +44 020 7851 5000 enquiries@thecrownestate.co.uk custodian N-Sea Survey BV info@n-sea.com originator The Crown Estate +44 020 7851 5000 enquiries@thecrownestate.co.uk distributor Orsted Customer-questions@orsted.com owner notPlanned Delimited Documents https://www.marinedataexchange.co.uk/details/TCE-2221/summary A link to the web service or dataset. https://www.marinedataexchange.co.uk A link to the general host site. Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08T00:00:00 publication Conformity with the Commission Regulation (EU) No 1089/2010 was either not relevant to this dataset or not a requirement of the Marine Data Exchange for the creation and submission of this dataset; therefore, conformity has not been assessed and cannot be declared False series Surface positioning of the vessel was achieved using two identical Veripos LD2 GPS systems with ‘Ultra’ Precise Point Positioning solution. These units were configured to receive corrections from different geostationary satellites thus making them truly independent for effective redundancy. The Veripos Ultra solution has a quoted horizontal accuracy of 0.1m. The CPT and vibrocore locations were positioned subsea using an AppliedAcoustics Nexus EasyTrak USBL system with a transponder attached to a known position on the top of the CPT frame / vibrocorer. For sites where the water depth was too shallow to use subsea positioning effectively, the coordinates were determined by applying a fixed offset from a known control point on the vessel to the CPT/vibrocore deployment location. This method was believed to have an accuracy of around ±1m, because there was little deviation of the CPT/vibrocore from the vertical position of the crane wire, and was used at sites WE45, WE47, WE48 and WE49. To minimise settlement of the CPT rig in areas of soft sediment, hinged footplates were mounted on the frame to increase the footprint and spread the load. In order to measure any settlement of the CPT rig that occurred in spite of the mitigation measures, an altimeter was mounted on the frame at a known height of 2.27m above the base. The altimeter was monitored in real-time as the CPT rig was lowered onto the seabed. An initial reading was recorded when the CPT was landed on the seabed, and a final reading was recorded prior to recovery to deck. In both cases the settlement was calculated by subtracting the observed altitude from the altimeter offset of 2.27m. The Crown Estate +44 020 7851 5000 enquiries@thecrownestate.co.uk pointOfContact EPSG Geodetic Parameter Registry 2022-12-12 revision WGS 84 / UTM zone 30N