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.
A detailed analysis of failure modes for seadikes has been performed and was used to derive a complete set of limit state equations for the description of failure scenarios of seadikes. These models and scenarios were then used to calculate the respective failure probabilities and the overall failure probability by a fault tree approach. A simple example of a non-existing seadike was used to illustrate the procedure. Details of parameters, model uncertainties and their influences on the results as well as further information required for the aforementioned procedure are also discussed.
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