The purpose of this study is to numerically discuss countermeasures against wave overtopping around a coastal revetment in main Okinawa Island using a numerical wave flume 'CADMAS-SURF'. Optimum crest height and wave overtopping quantity were examined for three types of revetments of an upright seawall with an offshore breakwater, a seawall covered with wave-dissipating blocks and a flaring-shaped seawall. As a result, it was revealed that the countermeasure can be selected so as to adapt to the characteristics of the region based on the numerical results taking into account economy efficiency of construction, landscape and the coastal environment. The numerical wave flume 'CADMAS-SURF' was , therefore, found to be useful in the examination of countermeasures against wave overtopping.

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