5222e4f22ac0dcddc9e05c0611ee2d9f English series series 2026-02-05T15:42:34 MEDIN 3.1.2 biota oceans Cetacean behaviour SeaDataNet Parameter Discovery Vocabulary 2023-12-12 revision Cetacean abundance SeaDataNet Parameter Discovery Vocabulary 2023-12-12 revision Pre-Construction monitoring The Crown Estate Renewable Energy Development Phases 2012-05-15 revision Agreement for Lease Area The Crown Estate Renewable Energy Development Areas 2012-05-15 revision Species distribution GEMET - INSPIRE themes, version 1.0 2009-07-31 revision SeaVoX Vertical Co-ordinate Coverages 2020-05-21 revision water column 2022-06-14T00:00:00 2023-12-01T00:00:00 -4.652 -4.8244 53.2279 53.3557 TCE-3931 Marine Data Exchange 2022-2023, Bangor University, Marine Characterisation Research Project, Marine mammal Acoustic Surveys (WP11) Marine mammal Acoustic Surveys (WP11) 2023-08-08T00:00:00 creation 2026-01-07T14:09:40 publication 2023-12-18T00:00:00 revision English This data series was collected for the Marine Characterisation project (MCRP) which forms part of the Morlais tidal energy project, managed by Menter Môn and funded by the European Regional Development Fund and The Crown Estate. The series is comprised of acoustic hydrophone data used to detect the presence of marine mammals (primarily harbour porpoise). These data were recorded during monthly boat based marine mammal observation surveys. Please see other data packages associated with WP11: 2022-2023, Bangor University, Morlais, Marine Characterisation Research Project - Echosounder surveys (WP11) 2022-2023, Bangor University, Marine Characterisation Research Project, Seabird and marine mammal observations (WP11) Access to the MCRP data is strictly subject to the MCRP Data Terms of Use. Please ensure that you read and understand the Terms of Use prior to using any of the data as you will be bound to comply with the same. The MCRP Terms of Use are the prevailing Terms of Use and supersede that of Marine Data Exchange Terms of Use in relation to MCRP data. https://www.marinedataexchange.co.uk/content/info/terms-of-use otherRestrictions Once published, there will be no constraints on access and use. Data must be used in accordance with the Marine Data Exchanges Terms of Use which can be found on the website. otherRestrictions The Crown Estate +44 020 7851 5000 enquiries@thecrownestate.co.uk custodian Bangor University School of Ocean Sciences Research Officer dassh.enquiries@mba.ac.uk originator The Crown Estate +44 020 7851 5000 enquiries@thecrownestate.co.uk distributor Mentor Mon helenr@mentermon.com owner notPlanned Database https://www.marinedataexchange.co.uk/details/TCE-3931/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 Underwater Noise 2025-11-27 revision This series has been Quality Assured so that it is compliant with the aforementioned MEDIN Guidelines and thus contains the mandatory components. In some instances, this compliance will not be feasible. True series Survey A originally used the 13 parallel transects designed by Natural Power (Morlais 2019, Figure 2.2). The transect lines of varying length were orientated in a west-east direction and were spaced approximately 0.92 km apart. The vessel travelled south through the transects when the tide is flooding North and travels north when the tide is ebbing south, to avoid double counting seabirds drifting on the water. Whilst performing transects, the vessel maintained a speed over ground of approximately 10 knots. However, following the maiden survey on 15/05/2023, it became evident that completing the original Survey A and Survey B on the same day was not possible. Therefore, to allow both surveys to be completed, only 6 or 7 transect lines were carried out each month. The transect lines were alternated amongst months i.e., odd numbers in one month, followed by even numbers the next month. Survey B used the 10 zigzag transect routes designed by SEACAMS2 (Veneruso et al 2019, Fig 2.2), combining 2 observation teams and a high-frequency stereo hydrophone system (Marine Ecological Research). The transect lines were spaced 1 km apart. This survey design allowed collection of concurrent acoustic and observational information for marine mammals within the MDZ. The hydrophone was primarily deployed to detected harbour porpoise, whose almost continuous vocalisations (Sørensen et al 2018) make them suitable for acoustic detection. The vessel moved with the direction of the tide during the survey, reducing the background noise and increasing the likelihood of acoustic detections. One transect was surveyed per month and transects were alternated equally amongst months. Whilst performing these transects, the vessel maintained a speed over ground of approximately 10 knots. ABP Marine Environmental Research Ltd enquiries@abpmer.co.uk pointOfContact EPSG Geodetic Parameter Registry 2022-11-29 revision WGS 84