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In the previous study, we have proposed a water chamber type water exchange breakwater , in which the unidirectional current is excited by the vortex flows driven by wave motions in the water chamber . This breakwater has another great advantage, i.e., low wave reflections and transmissions. It has a greatdeal of wave energy dissipation function. In this study, we have examined effectiveness of the new water-exchange breakwater in the three wave fields, typically in a harbor. The harbor tranquility obtained by the new breakwater was examined as compared to the conventional vertical breakwater case. The numerical analysis based on the vertical line source Green's function method was used to predict the calmness in a harbor partly surrounded bythe water exchange breakwater. The mean current feature and its effect in a harbor induced by wave actions about the water exchange breakwater were also examined experimentally to improve the water pollution problem in a harbor .

PERFORMANCE OF A WATER EXCHANGE BREAKWATER OF WATER CHAMBER TYPE IN A HARBOR