Mechanism of Backfilling Sand Discharge from a Gap under Vertical Revetment
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 134, Issue 3
Abstract
Coastal disasters such as sliding, settlement, and overturning of coastal structures as well as subsidence of reclaimed areas occur due to toe scouring and backfilling sand discharge. In this study, the sand discharge mechanism from a gap under a vertical revetment without wave absorption and foot protection is investigated using hydraulic model experiments and newly developed numerical simulations. In the hydraulic model experiments, sand discharge and sinkholes similar to those observed in the field surveys are reproduced, and it is found that sand discharge is very sensitive to wave steepness and relative gap height. In numerical simulations, a comparison with the experimental data demonstrates the validity of the numerical methods. It is revealed that sand discharge tends to occur with an increase of the maximum seaward velocity just outside the gap under the revetment as well as the maximum volumetric strain inside the most offshore side of the sand inside the gap.
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Acknowledgments
The writers wish to express their gratitude to Professor K. Iwata, Department of Civil Engineering, Chubu University, Japan, for valuable comments and helpful suggestions. They would also like to thank Aichi Prefectural Government for supplying valuable photographs of an actual sinkhole on a road built over a vertical revetment in Aichi Prefecture, Japan.
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Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 134 • Issue 3 • May 2008
Pages: 178 - 186
Copyright
© 2008 ASCE.
History
Received: Jul 11, 2006
Accepted: Aug 3, 2007
Published online: May 1, 2008
Published in print: May 2008
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