Analytical Approach to Calculate Rate of Bank Erosion
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Volume 131, Issue 11
Abstract
Bank erosion consists of two processes: basal erosion due to fluvial hydraulic force and bank failure under the influence of gravity. Because bank resistance force varies with the degree of saturation of bank material, the probability of bank failure is the probability of the driving force of bank failure being greater than the bank resistance force. The degree of saturation of bank material increases with river stage; therefore, the frequency of bank failure is correlated to the frequency of flooding. Consequently, the rate of bank erosion is due to both basal erosion and bank failure, and bank failure is a probabilistic phenomenon. In this paper, for cohesive bank material experiencing planar bank failure, a deterministic approach was adopted for basal erosion analysis, whereas the probability of bank failure was included in the analysis of bank failure. A method for calculating the rate of bank erosion was derived that integrates both basal erosion and bank failure processes, and accounts for the effects of hydraulic force, bank geometry, bank material properties, and probability of bank failure.
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Acknowledgements
This work is a result of research sponsored by the U.S. Department of Defense, Army Research Office, under Grant No. USARODAAD19-00-1-0157. The contribution from Dr. Deyu Zhong, who was a visiting scientist from Tsinghua University at Beijing, P.R. China, is highly appreciated. Dr. Steve Darby has pre-reviewed this paper, and made significant recommendations to improve the technical presentation and English writing. The writer is grateful to him for his advice. The writer also would like to recognize the valuable comments from the editor, associate editor, and the three anonymous reviewers that improved the quality of this manuscript.
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Information
Published In
Journal of Hydraulic Engineering
Volume 131 • Issue 11 • November 2005
Pages: 980 - 990
Copyright
© 2005 ASCE.
History
Received: Sep 23, 2003
Accepted: Mar 1, 2005
Published online: Nov 1, 2005
Published in print: Nov 2005
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