Abstract
A stepped seawall with a large drainage is expected to reduce both wave overtopping to coastal land areas and wave reflection toward the offshore direction. For the economical design of such a seawall, it is important to estimate wave overtopping phenomenon as well as the adequate volume of the drainage. This paper aims to investigate wave overtopping process as well as overtopping quantity on the stepped seawall with the drainage by conducting hydraulic experiments and numerical simulations with a numerical wave flume CADMAS-SURF. As a result, it was confirmed that wave overtopping characteristics depend on wave condition and the computational results were in good agreement with the experimental ones. The effect of optimal parameters in the CADMAS-SURF on wave overtopping was also examined.
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