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The Porous Effect on the Bottom Instability Under Partially Standing Waves

Published online by Cambridge University Press:  05 May 2011

Shih-Chun Hsiao  and
Philip L.-F. Liu
Shih-Chun Hsiao*
Affiliation:
Department of Mechanical Engineering, University of New Mexico, Albuquerque, NM87131, U.S.A.
Philip L.-F. Liu*
Affiliation:
School of Civil and Environmental Engineering, Cornell University, Ithaca, NY 14850–2488, U.S.A.
*
* Professor
** Postdoctoral Fellow
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Abstract

In this paper, we extended Blondeaux [1], Liu, et al. [2] and Mei and Yu's [3] theories to study the porous effect on instability of rippled bed under the partially standing surface waves. Comparisons are made with both Blondeaux and Mei & Yu's theoretical predictions and experimental data performed by many other authors. We found that based on the linear instability analysis and the parameter regimes we explored the percolation effect can change the threshold conditions by 10 ∼ 20 percent and the seepage force is negligible up to O(∈). Furthermore, the steady streamings with or without porous effect show the considerable difference in intensities at the same locations and it might change the sediment transport rate especially the suspended load.

Type
Articles
Information
Journal of Mechanics , Volume 18 , Issue 2 , June 2002 , pp. 53 - 66
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2002

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