Abstract
This study aims development of wave power generation system using wave energy in coastal zone. A wave power generation system using a vertical slit type breakwater widely used in Japanese ports and harbors is proposed by installing an improved Savonius windmill in a chamber of the breakwater. Laboratory experiment was carried out to examine the characteristics of power generation by measurement of the rotational speed and the torque of the windmill. According to the measurement results, the relationship between obtained power and wave condition was discussed. The effect of installing the windmill in a chamber of the breakwater on wave reflection was also discussed.