Sand Suspension and Transport on Equilibrium Beach
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 128, Issue 6
Abstract
A time-dependent cross-shore model for sand suspension and transport in the surf zone on a beach is compared with an irregular wave experiment that was conducted on an equilibrium terraced beach, consisting of fine sand in a wave flume. The measured free surface elevations and cross-shore velocities dominated by irregular wave motions are predicted within errors of the order of 20%. The measured sand concentrations dominated by intermittent high suspension events are predicted only within a factor of about two, because this 1D numerical model does not account for sand suspension processes due to eddies and turbulence generated by irregular breaking waves. The computed net cross-shore sediment transport rate is relatively small and is not zero when the net rate must be zero for the equilibrium beach. Relatedly, the computed difference between the time-averaged sand suspension and settling rates is relatively small and is not zero. A better understanding of sand suspension processes will be required to predict the small net rates more accurately.
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Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 128 • Issue 6 • November 2002
Pages: 238 - 248
Copyright
Copyright © 2002 American Society of Civil Engineers.
History
Received: Nov 19, 2001
Accepted: Jun 11, 2002
Published online: Oct 15, 2002
Published in print: Nov 2002
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