d1ab2ce1-9cbd-4fa9-aade-729559568f1b eng series DONG Energy Power (UK) Ltd Data Manager receplon@dongenergy.co.uk pointOfContact 2016-08-10 MEDIN Discovery metadata standard 2.3.7 urn:ogc:def:crs:EPSG::4326 2007, Osiris Projects, Gunfleet Sands 1 and 2, Additional Geophysical Surveys 2007 publication 710 On the instructions of Dong Energy, Osiris Projects were commissioned to carry out additional survey and sampling works across the Gunfleet 1 and Gunfleet II offshore wind farm sites in the outer Thames estuary, in order to supplement existing data sets collected during previous surveys carried out during 2001 and 2005. Supplemental bathymetric surveys were carried out in order to provide a comprehensive overview of bed levels within the extents of the consented Gunfleet Sands wind farm development area. This data is to be used for comparison with existing survey data in order to provide up-to date information on sediment movement across the area and also to assist in the detailed design and construction of the wind turbine installations and cable burial. DONG Energy Power (UK) Ltd Data Manager receplon@dongenergy.co.uk custodian Osiris Projects +44 (0)151 328 1120 +44 (0)151 343 1057 Maritime House 4 Brunel Road Croft Business Park Bromborough Wirral CH62 3NY United Kingdom enquiries@osirisprojects.co.uk http://www.osirisprojects.co.uk/ originator notPlanned Pre-Construction engineering The Crown Estate Renewable Energy Development Phases 2012-05-15 revision 1 Bathymetry and Elevation SeaDataNet Parameter Discovery Vocabulary 2016-06-03 revision 93 Seismic reflection SeaDataNet Parameter Discovery Vocabulary 2017-02-03 revision 97 Seismic refraction SeaDataNet Parameter Discovery Vocabulary 2017-02-03 revision 97 Renewable Energy Lease area The Crown Estate Renewable Energy Development Areas 2012-05-15 revision 1 Magnetics SeaDataNet Parameter Discovery Vocabulary 2017-02-03 revision 97 Side-scan sonar SeaDataNet Parameter Discovery Vocabulary 2017-02-03 revision 97 Marine Environmental Data and Information Network Marine Environmental Data and Information Network http://marinedataexchange.co.uk/pages/terms-of-use.aspx otherRestrictions otherRestrictions http://marinedataexchange.co.uk/pages/terms-of-use.aspx Available for use providing the originators are acknowledged in any publications produced. eng elevation geoscientificInformation oceans Charting Progress 2 Sea Areas 2009-06-18 creation Southern North Sea International Hydrographic Bureau, Limits of Oceans and Seas 1954-01-01 creation North Sea 1 2 51 52.5 2007-03-15 2007-06-15 http://www.marinedataexchange.co.uk/search?q=#fq=fq%3DProject%253Amde1r2gs28566 download https://www.marinedataexchange.co.uk/details/552/summary A link to the web service or dataset. https://www.marinedataexchange.co.uk A link to the general host site. series Geophysical survey lines were run at 20m centres, in a NE – SW orientation, with cross lines perpendicular to these at 250m centres. All lines were run using multi-beam echo sounder, side scan sonar, sub-bottom profiling and magnetic gradiometer techniques. A series of grab samples were taken across the survey area, using a 0.1m² Day Grab, at selected locations, provided by the Client. These were sent to the Centre for Marine and Coastal Studies (CMACS) Limited laboratory in Birkenhead for benthic, contaminant and particle size analyses. The results of these tests lay outside of the remit of this report and are to be produced, under separate cover, by CMACS. Finally, a series of potential unexploded ordnance targets were investigated using a SeaEye ‘Falcon’ ROV. This unit was equipped with a Kongsberg 1071, 675 kHz sonar head and later with a Kongsberg 3000, 2.25 MHz sonar head, in order to provide high definition images of the potential UXO targets. Drop-down video investigations were also undertaken at selected sites, but water visibility was found to be very poor.