Chapter
Dec 31, 2015
Wave Entrainment of Sand from a Rippled Bed
Publication: Coastal Engineering 1990
Abstract
Wave-orbital velocities at 20 cm above the bed and continuous vertical profiles of near-bed suspended-sediment concentration were measured seaward of the surfzone over a rippled bed. Sand was intermittently entrained from the bed and ejected upwards in discrete clouds. The typical sequence of events in the entrainment cycle, with sand being rolled up in a thin near-bed layer and ejected into the flow on alternating wave strokes, is attributed to the action of vortices shed from the bed ripples by the reversing flow. The orderly cycle of events causes a time-domain correlation between the wave fluctuations of velocity and concentration, and the resulting sediment flux is comparable in size, and at some elevations directed opposite to, the mean sediment flux.
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Published In
Coastal Engineering 1990
Pages: 2200 - 2212
Copyright
© 1991 American Society of Civil Engineers.
History
Published online: Dec 31, 2015
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Malcolm O. Green
Bullard Laboratories, Department of Earth Sciences, University of Cambridge, Cambridge, CB3 OEZ, England.
Christopher E. Vincent
School of Environmental Sciences, University of East Anglia, Norwich, NR4 7TJ, England.
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