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ICES Journal of Marine Science: Journal du Conseil 2003 60(6):1373-1380; doi:10.1016/S1054-3139(03)00151-6
© 2003 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
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Factors affecting the performance of the acoustic ground discrimination system RoxAnnTM

Thomas A Wilding*, Martin D.J Sayer and Paul G Provost

Scottish Association for Marine Science, Dunstaffnage Marine Laboratory Dunbeg, OBAN, Argyll PA37 1QA, Scotland, UK

*Correspondence to T. A. Wilding; tel: +44 1631 559000; fax: +44 1631 559001. e-mail: tom.wilding{at}sams.ac.uk.

The resolution, temporal variability and survey vessel speed dependence of the acoustic ground discrimination system RoxAnnTM was assessed over a 1 km2 area in Loch Linnhe on the west coast of Scotland. The resolution of the system was relatively poor and of the sediment parameters quantified (stone cover and sediment texture), only stone cover was consistently and significantly related to the RoxAnnTM output. The output showed considerable variability over the same ground when sampled within the same day and between days and months. The effect of survey vessel speed on the output was also significant but highly variable during all surveys. The apparent magnitude and unpredictable nature of the variation in the RoxAnnTM output have implications for the use of such systems in habitat mapping, particularly when surveying biological communities where there are only small differences in the physical properties of the seabed and also where monitoring temporal change. These aspects are discussed.

Keywords: acoustic ground discrimination system, AGDS, benthic surveys, RoxAnnTM, sediment mapping

Received 10 December 2002; accepted 18 July 2003.


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C. J. Brown, A. Mitchell, D. S. Limpenny, M. R. Robertson, M. Service, and N. Golding
Mapping seabed habitats in the Firth of Lorn off the west coast of Scotland: evaluation and comparison of habitat maps produced using the acoustic ground-discrimination system, RoxAnn, and sidescan sonar
ICES J. Mar. Sci., January 1, 2005; 62(4): 790 - 802.
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