Continuity of Instantaneous Wave Overtopping Discharge with Application to Stream Power Concepts
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 137, Issue 1
Abstract
During nine small-scale laboratory experiments simulating combined wave overtopping and storm surge overflow on a trapezoidal levee, time series measurements of flow thickness and velocity were acquired at a location on the levee crest and at a location on the landward-side slope. Flow thickness and velocity were combined to estimate time series of the instantaneous discharge. Comparisons of the calculated overtopping discharge time series at the two locations revealed that the time series of instantaneous discharge was the same at both locations with the only difference being a short phase lag. Individual peaks of the discharge time series were examined, and an empirical expression was determined for the root-mean-squared discharge peak. The largest discharge peaks were overestimated by the Rayleigh distribution. For locations on the landward-side slope where the friction slope is approximately the same as the levee slope, it is possible to derive a stream power probability density function based on the overtopping discharge cumulative exceedance probability. The stream power probability density function may be a useful tool for assessing erosion potential of overtopped earthen levees.
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Acknowledgments
The research described and the results presented herein, unless otherwise noted, were obtained with support from the research project titled Increasing Community Disaster Resilience Through Targeted Strengthening of Critical Infrastructure at Mississippi State University under Project No. UNSPECIFIED70015 and principal investigator Isaac L. Howard. The project was funded by the U.S. Department of Homeland Security through the Southeast Regional Research Initiative (SERRI). Permission was granted by Headquarters, U.S. Army Corps of Engineers, to publish this information. Special thanks to Hugh Acuff, Julie Cohen, and Tim Nisley for their careful and critical support of the laboratory experiments and thanks to Dr. Norberto Nadal for a beneficial review of the early draft. The writers gratefully acknowledge the insightful and constructive suggestions of the anonymous reviewers.UNSPECIFIED
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Information & Authors
Information
Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 137 • Issue 1 • January 2011
Pages: 12 - 25
Copyright
© 2011 ASCE.
History
Received: Nov 12, 2009
Accepted: May 6, 2010
Published online: May 13, 2010
Published in print: Jan 2011
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