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Operations Report : BGS Project 04/04 marine geophysics survey 2004 Outer Bristol Channel

By D.J. Smith

Abstract

This report describes the operation for BGS Project, managed and run by BGS Marine\ud Operations and Engineering. The report covers the mobilisation on the 18th August, the\ud geophysical survey and the demobilisation on the 28th August 2004. The main objective of the\ud survey was to provide baseline physical and geological data for the sustainable development of\ud sea-bed resources. This survey is part of a larger BGS project ‘The Outer Bristol Channel\ud Marine Habitat Study’\ud The operational aims of the survey project were:\ud • To continue with a planned programme, (started last year) of 100% data coverage for 11\ud corridors, 1km wide of multibeam and sidescan sonar\ud • Additionally run the centre line for each corridor with surface tow boomer\ud • Map any interesting features found during the survey\ud The geophysical techniques employed were high-resolution multibeam bathymetry, highresolution\ud sidescan sonar and single channel seismic reflection, (surface tow boomer). All\ud systems were digitally recorded.\ud The vessel used was the RV Prince Madog. This platform proved reliable. Laboratory space\ud was adapted to provide an adequate area. An over the side pole mounted multibeam transducer\ud produced good data collected in marginal weather conditions, the data suffering slightly from\ud pole vibrations. Line steerage was vastly improved from the 2003 survey and was adequate for\ud this project.\ud Although an improvement upon project 03/03 the poor weather played a large part in the survey.\ud This only allowed 4 lines of surface tow boomer to be completed

Topics: Earth Sciences
Publisher: British Geological Survey
Year: 2005
OAI identifier: oai:nora.nerc.ac.uk:11121

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