Grain size sorting over offshore sandwaves Observations and modelling
conference paper
Offshore sandwaves are rhythmic bed patterns widely present in shallowshelf seas. Observations from the North Sea indicate a trend of coarser sediment with a higher sorting at sandwave crests. In this study, we present an extended model for sandwave dynamics that accounts for the presence and transport of non-uniform sediment. The extension involves an active layer as well as a fractional calculation of sediment transport, which includes hiding-exposure effects. Simulations of a growing sandwave for a bimodal mixture indicate a coarsening trend towards the crest, whereas in the sandwave troughs the sediment remains mixed. The model results show qualitative agreement with observations from various sites in the North Sea. © 2008 Taylor & Francis Group, London.
Topics
TNO Identifier
953984
ISBN
9780415441
Source title
Proceedings of the 5th IAHR Symposium on River, Coastal and Estuarine Morphodynamics, 5th IAHR-Symposium on River, Coastal and Estuarine Morphodynamics, RCEM 2007, 17 September 2007 through 21 September 2007
Pages
649-656
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