Generation mechanism of the rip current at the semi-enclosed beach by the groin

This study tried to comprehend the generation mechanism of rip current at the enclosed beach by the groins. Firstly, this study did field survey and comprehended the large scale and velocity of rip current. In this method, the rip current was pigmented by the sea water colorant, and the pigmented current was recorded as the aerial photography by the multi-copter. Secondly, this study simulated the rip current in accordance with the results of field survey, and the results of simulation and filed survey ware compared.