NRW_DS109893 eng NRW_DS109891 dataset Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en pointOfContact 2026-03-03T16:20:39 MEDIN 3.1.2 wel eng utf8 Latitude and Longitude (EPSG::4326) Review of Side-Scan Sonar Results from North Llyn Modiolus Reef Review of Side-Scan Sonar Results from North Llyn Modiolus Reef Adolygiad o ganlyniadau gwaith monitro sonar yng Ngogledd Llyn 2007-09-30 publication 4f4c4942-4343-5764-6473-313039383933 An emergency review of side-scan sonar data collected by Countryside Council for Wales (CCW) in 2007 was required as the images showed marks that were potentially derived from trawling gear. The area was approximately 10 km by 6 km and approximately 1.5 km offshore, within the Pen Llyn a'r sarnau Special Area of Conservation (SAC) and is also protected under Sea Fisheries byelaws that prevent the use of trawls and dredges for the harvesting of molluscan shellfish, except as authorised by the local sea fisheries committee. An emergency review of side-scan sonar data collected by Countryside Council for Wales (CCW) in 2007 was required as the images showed marks that were potentially derived from trawling gear. The area was approximately 10 km by 6 km and approximately 1.5 km offshore, within the Pen Llyn a'r sarnau Special Area of Conservation (SAC) and is also protected under Sea Fisheries byelaws that prevent the use of trawls and dredges for the harvesting of molluscan shellfish, except as authorised by the local sea fisheries committee. Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en owner Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en custodian University of Liverpool Earth, Ocean and Ecological Sciences, University of Liverpool, Nicholson Building, Liverpool, L69 3GP Leonie.Robinson@liverpool.ac.uk http://www.liv.ac.uk/ecology originator Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en distributor notPlanned Habitats and biotopes theme GEMET - INSPIRE themes, version 1.0 2008-06-01 publication geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme Special Area of Conservation Monitoring sidescan sonar cockle dredging (hydraulic dredging) modiolus modiolus horse mussel acoustic observation (acoustic monitoring) disturbance Pen Llyn a'r Sarnau cSAC biogenic reef theme NRW Thesaurus 2025-01-08 publication geonetwork.thesaurus.local.theme.converted_nrw-keywords Side-scan sonar Habitat characterisation Habitat extent theme SeaDataNet Parameter Discovery Vocabulary 2024-06-19 publication geonetwork.thesaurus.external.theme.rdf+xml otherRestrictions There are no access restrictions to this data. NRW may release, publish or disseminate it freely. no limitations otherRestrictions © CNC/NRW 2007 There are no use restrictions on this data. Recipients may re-use, reproduce, disseminate this data free of charge in any format or medium, provided they do so accurately, acknowledging both the source and NRW's copyright, and do not use it in a misleading context. It is the recipient's responsibility to ensure the data is fit for the intended purpose, that dissemination or publishing does not result in duplication, and that it is fairly interpreted. Advice on interpretation should be sought where required. To avoid re-using old data, users should periodically obtain the latest version from the original source. Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved. vector eng utf8 oceans NRW Geographic Identifiers Collection 2024-01-01 publication GWYNEDD - GWYNEDD -4.71395825 -4.58178064 52.90351843 52.98355757 SeaVoX Vertical Co-ordinate Coverages 2013-02-05 creation benthic boundary layer 2007-05-24 2009-03-31 -25 -45 For further information about the methodology used for acoustic monitoring, please refer to metadata entry \Acoustic Monitoring of the North Llyn Modiolus reef - NRW_DS109891\". " Image All raster images held as tif files. Movie Video footage held on mini DV tapes. dataset 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 2010-12-08 publication This dataset has not been assessed for conformance to the referenced INSPIRE regulation. false Side-scan images were collected by CCW as part of their annual monitoring of the reef. In addition to sides-scan sonar images, 3 dives were conducted in the area. Digital high definition video footage from the dives was edited and slowed so they could be examined for evidence of disturbance. Maps of sediment types and waved and tidally induced bed-sheer stress for the locality were provided by the HABMAP project. This project is based on annual side-scan sonar data collected by CCW as part of ongoing monitoring on the site. Data for 2007 identified anthropogenic activities on the site that required further study. Side-scan images were collected by CCW as part of their annual monitoring of the reef. In addition to sides-scan sonar images, 3 dives were conducted in the area. Digital high definition video footage from the dives was edited and slowed so they could be examined for evidence of disturbance. Maps of sediment types and waved and tidally induced bed-sheer stress for the locality were provided by the HABMAP project. This project is based on annual side-scan sonar data collected by CCW as part of ongoing monitoring on the site. Data for 2007 identified anthropogenic activities on the site that required further study.