Physics
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30toce2t&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 20, pp. OCE 2-1, CiteID 2028, DOI 10.1029/2003GL018427
Physics
5
Oceanography: Physical: Sediment Transport, Oceanography: Physical: Nearshore Processes, Oceanography: Physical: Turbulence, Diffusion, And Mixing Processes, Oceanography: Physical: Surface Waves And Tides (1255), Oceanography: Physical: Instruments And Techniques
Scientific paper
In general, descriptions of suspended sediment transport beneath surface waves are based on the turbulent diffusion concept. However, it is recognised that this approach is questionable for the suspension of sediment when the seabed is rippled. In this case, at least if the ripples are sufficiently steep, the entrainment process is likely to be well organised, and associated with vortex formation and shedding from the ripples. To investigate the entrainment process above ripples, a study was carried out in a large-scale wave flume facility. Utilising acoustic techniques, visualisations of the intra-wave sediment entrainment above vortex ripples have been generated. The observations provide a detailed description of entrainment, which is interpreted here in relation to the process of vortex formation and shedding. It is anticipated that such measurements will contribute to the development of improved physical process models of sediment transport in the rippled bed regime.
Davies Andrew G.
Thorne Peter D.
Williams Jon J.
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