EFFECTIVENESS OF A WATER CHAMBER TYPE BREAKWATER WITH AN INCLINED PLATE ARRAY AS A FRONT IN A HARBOR

We have proposed a new type breakwater supported by piles, which consists of three major parts, i. e., an inclined plate array as a front wall, a vertical rear wall and a submerged plate at the bottom. It has been confirmed by the two dimensional study of vertical plane that the breakwater enables to reduce both reflected and transmitted waves for comparatively wide range of wave frequency, and also to generate mean current by wave actions in the offshore direction. In this study, we have examined the performance of this type of breakwater in the three dimensional wave fields, such as a harbor model basin. For the comparisons, conventional breakwaters, such as a curtain-walled breakwater and also a vertical impermeable breakwater, were also used as a harbor breakwater model. For the theoretical prediction of wave height distributions around the harbor, applicability of the numerical analysis based on the vertical line source Green's function method was extensively examined.