Wave overtopping resistance of grassed dike slopes in Vietnam

Conference paper (2011)
Department
Hydraulic Engineering (CEG) (TU Delft)
Copyright: Delft University of Technology
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Published Date

05-09-2011

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Source:

Coastal Structures 2011 : Proceedings of the 6th International Conference on Coastal Structures, Yokohama, Japan, 5-9 September, 2011

Faculty

Civil Engineering and Geosciences

Department

Hydraulic Engineering

Abstract

The resistance of various grassed slopes against wave overtopping has been appraised by means of the Wave Overtopping Simulator in situ for a couple of years in Viet Nam. Destructive test results show that a dike slope covered with grass could suffer a certain overtopping discharge not smaller than 20 l/s per m. During testing it was difficult to predict when a slope starts to be damaged, however, damages tend to follow a more or less similar process of development. The concept of “erosional indices” and the method of “cumulative overload” (van der Meer et al., 2010) are applied to the simulator tests in Viet Nam. Critical velocities were then estimated for different kind of grassed slopes.

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