Estimation of Discharge through a Levee Breach with Constant Cross Section
Publication: Journal of Hydraulic Engineering
Volume 144, Issue 4
Abstract
Levee breaches have resulted in significant damage and loss of life in recent years. Although this area has been of considerable interest to researchers, procedures are not available to compute the breach outflow accurately, which are needed for flood mitigation and emergency preparedness. In this work, the outflow discharge through a levee breach with constant cross section is computed by using two different models: the first solves the one-dimensional spatially varied flow equation, and the second numerically solves the two-dimensional Saint-Venant equation. Both models are applied to a breach in rectangular and trapezoidal channels. Different cases are simulated by varying the breach width, submergence ratio, and inflow discharge. It is found that the effect of breach width on the outflow is less than that caused by the submergence ratio. Breach outflows computed by a spatially varied flow model are higher than that by the two-dimensional model. A new relationship is proposed to correct the breach outflows calculated using the one-dimensional model.
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Acknowledgments
The authors thank the Egyptian Cultural and Educational Bureau for supporting the first author for his graduate studies. The funding from the National Science Foundation under the Partnerships for International Research and Education (PIRE) program (Grant No. OISE-0730246) is gratefully acknowledged. The authors thank the two anonymous reviewers for their helpful suggestions that have significantly improved the quality of the paper.
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Published In
Journal of Hydraulic Engineering
Volume 144 • Issue 4 • April 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Mar 30, 2017
Accepted: Sep 14, 2017
Published online: Feb 8, 2018
Published in print: Apr 1, 2018
Discussion open until: Jul 8, 2018
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