Individual overtopping events at dikes

Conference paper (2008)
Department
Hydraulic Engineering (CEG) (TU Delft)
Copyright: © 2008, Bosman, G., Van der Meers, J., Hoffmans, G., Schüttrumpf, Verhagen, H.J.
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Published Date

01-09-2008

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Source:

International Conference on Coastal Engineering (ICCE), 2008, Hamburg

Faculty

Civil Engineering and Geosciences

Department

Hydraulic Engineering

Abstract

Recently, formulae have been derived for maximum flow depths and velocities on the crest and inner slope of dikes or levees at wave overtopping. Two independent physical model test programs in different wave flumes showed, however, a large difference in the results. The present paper clarifies this discrepancy and shows that the empirical coefficients are dependent on the gradient of the outer slope. Subsequently, a formula for the overtopping time was created, based on the difference between fictive wave run-up and crest freeboard. The overtopping time appeared not to be a function of the outer slope. The variation of flow depth and velocity in time can be approached with a linear function.

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