https://ogcapi.bgs.ac.uk/collections/offshore-survey-overview/items/323
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id: 323.0
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contractor: Joint Nature Conservation Committee
start date est: Real
cruise data url: http://webapps.bgs.ac.uk/services/ngdc/accessions/index.html#item166887
cruise area: CP2 Regional Sea Boundaries: Western Channel & Celtic Sea, Offshore 1:250k: Little Sole Bank, SeaVoX Sub-Ocean: CELTIC SEA, NORTHEAST ATLANTIC OCEAN (40W)
end date: 2007-06-18T00:00:00
abstract: The survey was led by the Joint Nature Conservation Committee, in collaboration with the Marine Institute, the British Geological Survey and the University of Plymouth. Defra Natural Environment Group Science Division (CRO 361) made a significant contribution to this work. This work contributed to the MESH project (www.searchmesh.net). The MESH Project ran between 2004 and 2008 and was made up of a consortium of twelve partners from five European countries led by the UK’s Joint Nature Conservation Committee (JNCC), with financial support from the EC’s INTERREG IIIB NWE Programme. The MESH partnership drew together scientific and technical habitat-mapping skills, expertise in data collation and its management, and proven practical experience in the use of seabed-habitat maps for environmental management within national regulatory frameworks. The aims of the R/V Celtic Explorer cruise (CE0705) on 4th-18th June 2007 were to acquire high resolution multibeam, sub-bottom profiler and camera data in the SW Approaches area, located approximately 320km southwest of Land's End. The cruise not only mapped the variable morphology of the SW Approaches area, but also investigated the biological communities within the canyon system for the assessment of potential Special Areas of Conservation (SAC) under the EC Habitats and Birds Directive (Annex I) (Johnston et al. 2002). The cruise also tested the application of the survey standards and protocols developed under the MESH project. The cruise was the first thorough test for the recently completed MESH Guidance Framework, providing a 'proof of concept' from planning to completion. The backscatter and geophysics data are archived and available for download at the British Geological Survey (BGS) MEDIN Data Archive Centre (DAC) for Geology and Geophysics. Biological and bathymetry data are archived at DASSH and UKHO respectively. Technical details of the survey are contained in BGS Commissioned Report CR/07/123N (http://nora.nerc.ac.…
end date est: Real
cruise: 2007/6_MESH
additional info: Navigation: Fugro Starfix-HP (High Precision) GPS positioning system. All data acquisition systems took their time stamp from this navigation signal. The Starfix HP performed well during operations with only one significant occurrence of loss of navigation from 03:27 to 04:54 on the 9th June 2007 during seismic data acquisition on line 4. Some problems were experienced with the USBL system, particularly towards the latter half of the cruise. Multi-tip Sparker System: Source: EG&G, nine candle, multi-tip array with 135 tips. At times during the course of this cruise, it was sufficient to only operate with 90 tips. Power is supplied from an Applied Acoustic Engineering CSP-D HV Bangbox, running at 1000 Joules per shot on lines 1-7, 1250 Joules per shot on lines 8-11, 750-1500 Joules per pulse on line 12 and 1500 Joules per shot on lines 13-16. The CSP-D utilised the ship's main 240V 'domestic' power on a 16A circuit breaker. The Sparker was fired once every 6 seconds, interleaved with the Deep-Tow Boomer firing. Hydrophone: SIG 7 channel, 10m hydrophone streamer and SIG preamplifier with all channels summed to give a single channel output. The summed output was fed into the British Geological Survey (BGS) own designed amplifier that incorporates low pass and anti-alias filters and manually adjustable analogue gain to compensate for acoustic losses with water depth. For the Sparker system the bandpass filter is between 100 and 1730 Hz. Recording: The recording system is a CODA DA200 with twin displays and set up to digitally record two seismic sources simultaneously, in this case the Sparker and Deep Tow Boomer. The output data was stored in CODA and SEGY format. The Sparker signal was sampled at 5000Hz. Deep Tow Boomer System: Source: The Deep Tow Boomer system is a towed negatively buoyant fish comprising a 'boomer plate' transducer, high voltage storage and discharge system, a short hydrophone streamer and various sensors and controls. The high voltage power is supp…
confidentiality: unclassified (open file)
cruise alias: CE0705
nav equip type: Differential GPS
accessuse restric: unrestricted use, copyright acknowledgement
restitle: Geophysical, Multibeam, Photo and Video Survey 2007/6_MESH: 2007 MESH SW Approaches Canyons Survey (04/Jun/2007 to 18/Jun/2007)
geophys equip type: Deep Tow Boomer, Multibeam, Sparker
terms of use: Available under the Creative Commons Licence subject to the following acknowledgement accompanying the reproduced Department for Environment, Food and Rural Affairs, Joint Nature Conservation Committee, Marine Institute, British Geological Survey, University of Plymouth materials "Joint copyright ©2007 Defra, JNCC, Marine Institute, BGS, University of Plymouth"
ship: RV Celtic Explorer
client: Joint Nature Conservation Committee
start date: 2007-06-04T00:00:00
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