41aae766-6e9e-403a-b2d8-b1196c560e54 eng series The Crown Estate +44 020 7851 5000 16 New Burlington Place London W1S 2HX United Kingdom enquiries@thecrownestate.co.uk http://www.thecrownestate.co.uk pointOfContact 2015-12-17 MEDIN Discovery Metadata Standard Version 2.3.8 urn:ogc:def:crs:EPSG::4326 OGP 2011, ABPmer/CMACS, Burbo Bank Offshore Wind Farm, Metocean Survey to address Outstanding Licence Conditions 2011-02-11 publication This series presents the results of recent metocean survey work undertaken at the Burbo Bank Offshore Wind Farm, designed to address two outstanding licensing conditions: 1. Tidal Model Validation: There were concerns regarding the original tidal current data collected at the site and used to inform and validate the tidal model used in the original EIA study. To revalidate the model, new tidal current profile survey data were collected and compared to the model output. The results confirm that the original tidal model performs well in predicting tidal current speed and direction at the site. 2. Tidal Wake Validation: The original EIA study included the conservative prediction of tidal wake effects from an array of 30 turbines on 4m monopiles and the subsequent effect on regional sediment transport rates and pathways. To validate the accuracy of the tidal wake predictions by the model, a field survey was designed and undertaken to measure and map the gross flow properties of the tidal wake associated with the BB27 foundation (a 4.7m diameter monopile with rip-rap scour protection). The results of the wake survey compared closely to the modelled wake in terms of time mean flow properties but also differed somewhat in terms of the lateral extent of the wake in the very near-field (<200m downstream, a limitation of the model associated with mesh resolution) and the presence/absence of locally elevated turbulence (also a limitation of all such regional scale modelling tools). The implications of elevated levels of turbulence being observed in the field but not being present in the model are discussed in relation to the predicted patterns of sediment transport, suggesting that, on balance, the model correctly estimates the effect on sediment transport. The Crown Estate +44 020 7851 5000 16 New Burlington Place London W1S 2HX United Kingdom enquiries@thecrownestate.co.uk http://www.thecrownestate.co.uk custodian ABP Marine Environmental Research Ltd 02380711840 Quayside Suite, Medina Chambers, Town Quay Southampton SO14 2AQ United Kingdom enquiries@abpmer.co.uk http://www.abpmer.co.uk originator notPlanned PDF Renewable Energy Lease area The Crown Estate Renewable Energy Development Areas 2012-05-15 revision 1 Post-Construction monitoring The Crown Estate Renewable Energy Development Phases 2012-05-15 revision 1 Horizontal velocity of the water column (currents) SeaDataNet Parameter Discovery Vocabulary 2017-09-06 revision 103 Vertical velocity of the water column (currents) SeaDataNet Parameter Discovery Vocabulary 2017-09-06 revision 103 Raw current meter output parameters SeaDataNet Parameter Discovery Vocabulary 2017-09-06 revision 103 Acoustic Doppler Current Profiler Global Change Master Directory Instrument Keywords 2008-01-22 revision 3 Acoustic noise in the water column SeaDataNet Parameter Discovery Vocabulary 2017-09-06 revision 103 Sedimentary structure SeaDataNet Parameter Discovery Vocabulary 2017-09-06 revision 103 Marine Environmental Data and Information Network Marine Environmental Data and Information Network http://www.marinedataexchange.co.uk/pages/terms-of-use.aspx copyright copyright http://www.marinedataexchange.co.uk/pages/terms-of-use.aspx eng climatologyMeteorologyAtmosphere oceans -3.22354287211443 -3.14823996449776 53.470125002674 53.5039100333246 2010 2010 http://www.marinedataexchange.co.uk/search?q=#fq=fq%3DProject%253Amde1r1bb7447 download https://www.marinedataexchange.co.uk/details/199/summary A link to the web service or dataset. https://www.marinedataexchange.co.uk A link to the general host site. dataset Following the completion of all survey work, this report presents a comparison of modelled and measured wake effects as well as a comparison of modelled and measured currents at sites BB1 and BB2 to address the outstanding licence conditions.