Erosion of a Seaward Dike Slope by Wave Action
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 141, Issue 2
Abstract
A dike erosion model is developed to predict the temporal and cross-shore variations of vertical erosion depth under irregular wave action. The product of the erosion rate and the turf resistance force is related to the rate of erosion work by turbulence generated by wave energy dissipation caused by wave breaking and bottom friction. The turf resistance force is expressed using the turf thickness and the surface and underneath resistance parameters. The empirical parameters are calibrated using available data. The calibrated model is shown to reproduce the relation between the limiting velocity and steady flow duration, the erosion rate on a seaward grassed slope, and the eroded profile evolution of a seaward clay slope. The turf resistance parameters are uncertain and will need to be calibrated for specific dikes.
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Acknowledgments
This study was partially supported by U.S. Army Corps of Engineers Contract No. W911XK-13-P-0065 and the EU THESEUS Project. The writers thank two reviewers for useful comments.
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Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 141 • Issue 2 • March 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Mar 6, 2014
Accepted: May 15, 2014
Published online: Jul 7, 2014
Published in print: Mar 1, 2015
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