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Sand wave field : the Obel Sands, Bristol Channel, UK

James, J.W. Ceri; Mackie, Andrew S.Y.; Rees, E. Ivor S.; Darbyshire, Teresa. 2012 Sand wave field : the Obel Sands, Bristol Channel, UK. In: Harris, Peter T.; Baker, Elaine K., (eds.) Seafloor geomorphology as benthic habitat : GeoHAB atlas of seafloor geomorphic features and benthic habitats. Elsevier, 227-239. (Elsevier Insights).

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Abstract/Summary

The OBel Sands, an area of sand waves up to 19 m high, cover an extensive area, >1,000 km2, in the Outer Bristol Channel off the coast of Wales. The sand wave field can be divided into a northern half with a dense concentration of bedforms on a sand substrate, and southern half with isolated sand waves on a coarse substrate. In both areas, the sand waves are generally asymmetric in cross profile, with steep west-facing lee slopes associated with the Channel’s ebb tides. The sand waves commonly have abundant megaripples and secondary sand waves on their slopes; these dynamic environments maintain little or no epifauna. The infaunal assemblages are varied and primarily related to sediment composition, sediment stability, and depth. Species richness is highest in coarse sediment between isolated sand waves and on the nearby platform. These areas generally support a rich epifauna.

Item Type: Publication - Book Section
Digital Object Identifier (DOI): 10.1016/B978-0-12-385140-6.00012-8
Programmes: BGS Programmes 2010 > Marine Geoscience
Date made live: 17 Feb 2012 09:29
URI: http://nora.nerc.ac.uk/id/eprint/16820

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