Scour around Submerged Spur Dikes with Flexible Mattress Protection
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 144, Issue 5
Abstract
Flume experiments examining the effects of a flexible mattress on bed scour around spur dikes were conducted. Results showed that scour induced subsidence damage to the flexible mattress. If the width of flexible mattress, , was insufficient, then failure of the spur dike may occur. Results also revealed that (1) scour depth decreased as the area of the protective domain around the spur dike increased (e.g., it reduced 30%, from 20 to 14 cm, as the width increased from 0 to 0.35 m), and (2) higher approaching velocities resulted in deeper scour holes. On the basis of the experimental data and dimensional regression analysis, empirical formulas were proposed for calculating scour depth and the extent of the scour hole. The formulas were then used to obtain the optimum flexible mattress width.
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Acknowledgments
This study was founded by National Natural Science Foundation of China (Grants 11502032 and 11602034). The people who provided kind help in support of the experiment are also greatly appreciated. The authors are indebted to the anonymous reviewers for their constructive comments on an earlier version of the manuscript.
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Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 144 • Issue 5 • September 2018
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© 2018 American Society of Civil Engineers.
History
Received: Aug 24, 2017
Accepted: Mar 6, 2018
Published online: Jun 20, 2018
Published in print: Sep 1, 2018
Discussion open until: Nov 20, 2018
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