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In the previous study on the water exchange breakwater of a water-chamber type, we found out that unidirectional rotational flows are induced in the water chamber driven by wave induced vortex flows from the lower edge of a front curtain wall. In this study, we have examined the possibilities of such vortex flows for wave power extractions. Water mills with a few curved fms have been adopted as a device of wave energy extraction. By installing such water mills in the water chamber, rotational characteristics of the mill and its influences on the wave reflection and transmission as well as on the water exchange rate are clarified. Itwas confirmed that the water mill installed in the water chamber may be used as a wave power extraction device. It was also seen that the installation of the water mill in the water chamber has no influence on the original functions of the breakwater.

EFFECTIVENESS OF A CHAMBER-TYPE WATER EXCHANGE BREAKWATER AND ITS ABILITY OF WAVE POWER EXTERACTIONS BY WAVE INDUCED VORTEX FLOWS