Wave overtopping was responsible for many dike failures in the past. It is not feasible to avoid wave overtopping completely in the future due to uncertainties in the prediction of the design water levels and the costs of uneconomical high dikes. Therefore, wave overtopping has to be taken into account for the design of seadikes. The overtopping flow velocities and related layer thicknesses are required which are responsible for infiltration and erosion of the dike crest and the landward side of a dike. The objective of this paper is to study the flow velocities and related layer thicknesses associated with wave run-up and wave overtopping based on theoretical and experimental investigations.
The interaction of wave overtopping and the soil properties of a seadike is responsible for the initiation of dike failures and the breaching process. Unfortunately, the present design of seadikes is based on the separate determination of hydraulic and geotechnical design parameters. Therefore, large scale hydraulic model tests were setup on the basis of a detailed failure analysis for seadikes to investigate the infiltration and erosion process due to wave overtopping. Results are presented in this paper.
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