c2971a12-5381-4297-8bcc-eff5610216d6 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 2015-11-02 MEDIN Discovery Profile 2.3.8 2010, SMRU Ltd., SeaGen Strangford Lough, SeaGen Noise Biological Assessment 2010-08-06 publication SL_16 SeaGen produces underwater noise during operation that contains both tonal and broadband components which cover a frequency range similar to the most sensitive hearing range of several marine species. Underwater sound propagation models were used to predict noise levels around SeaGen. Within one kilometre of SeaGen, simple transmission loss models fit the data relatively well; however received levels were found to increase at distances of more than 3km. The source level of SeaGen was back-calculated using the field measurements and the sound propagation models; source level (rms) was estimated to be 174 dB re 1μPa. Although this is lower than some anthropogenic noise sources (e.g. seismic airguns), levels are comparable to a large vessel underway and it is important to highlight that SeaGen produces noise more or less continuously requiring longer exposure times to be taken into account when predicting hearing damage. The potential effects on fish and marine mammals of underwater noise from SeaGen were predicted using current information on hearing abilities and observed responses from previous studies, and are presented as a series of influence zones (e.g. zone of audibility, zone of behavioural responses) around SeaGen. It is important to highlight that predictions of influence zones must be viewed alongside their associated caveats. Specifically, empirical noise data were only available out to 3.5km from SeaGen; predictions of influence zones at ranges greater than this are therefore based solely on transmission loss models and must therefore be treated with caution. This series contains the assessment report. Marine Current Turbines Limited +44 (0)117 926 9906 St Brandon's House, 27-29 Great George Street, Bristol BS1 5QT http://www.marineturbines.com/ custodian SMRU Ltd 01334 463446 5, Atholl Crescent Edinburgh EH3 8EJ smru@st-andrews.ac.uk http://www.smru.st-andrews.ac.uk/ originator notPlanned .pdf Post-Construction monitoring The Crown Estate Renewable Energy Development Phases 2012-05-15 revision 1 Renewable Energy Lease area The Crown Estate Renewable Energy Development Areas 2012-05-15 revision 1 Cetacean morphology and physiology Cetacean behaviour Seal morphology and physiology Seal behaviour SeaDataNet Parameter Discovery Vocabulary 2015-09-09 revision 89 Ambient Noise Global Change Master Directory Science Keyword variables 2007-04-18 revision 4 fish SeaVoX Platform Categories 2015-03-27 revision 11 epibenthic invertebrates Marisaurus Thesaurus 2010-09-22 revision 28 Underwater Noise MEDIN Data Guidelines 2012-05-01 revision 3 Acoustic noise in the water column SeaDataNet Parameter Discovery Vocabulary 2016-02-17 revision 91 Marine Mammals Global Change Master Directory Science Keyword variables 2007-04-18 revision 4 Marine Environmental Data and Information Network Marine Environmental Data and Information Network http://marinedataexchange.co.uk/pages/terms-of-use.aspx copyright otherRestrictions copyright otherRestrictions http://marinedataexchange.co.uk/pages/terms-of-use. http://marinedataexchange.co.uk/pages/terms-of-use.aspx eng biota environment oceans -5.613444 -5.493281 54.306874 54.402910 2010 2010 http://www.marinedataexchange.co.uk/search?q=#fq=fq%3DProject%253Amde3dsl6786 download https://www.marinedataexchange.co.uk/details/1923/summary A link to the web service or dataset. https://www.marinedataexchange.co.uk A link to the general host site. series Metadata generated by The Crown Estate for the purpose of publishing on the Marine Data Exchange.