Estimation of the Washout Depth of Fine Sediments from a Granular Bed
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Volume 136, Issue 10
Abstract
An exponential distribution of the bed-pressure fluctuations is used to estimate the depth within a porous gravel bed from which fine sediment of a given size can be removed. The coarsest grain size of the fine sediment that might be washed out is of in relation to both the gravel grain size and the equivalent grain roughness. A higher equivalent grain roughness results to a larger absolute cleaning depth, whereas the averaged gravel grain size is seen to be less important. The results are successfully tested for plausibility against the grain size distributions of an armored gravel bed and its underlaying bimodal layer as found in situ in the river Rhine. However, qualitative and quantitative experimental data for an in-depth validation remain to be performed.
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Acknowledgments
The participation of the second writer was made possible by funding from the National Center for Earth-surface Dynamics, a Science and Technology Center of the U.S. National Science Foundation.NSF
References
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© 2010 ASCE.
History
Received: Mar 3, 2009
Accepted: Apr 23, 2010
Published online: Apr 27, 2010
Published in print: Oct 2010
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