Abstract
We have proposed a new breakwater, in which the unidirectional current is excited by the vortex flows driven by wave motions in the breakwater. It has a water chamber partly sheltered by a vertical curtain wall in front of a rear vertical wall. For deduction of mean currents due to wave induced vortex flows beneath thefront curtain wall, there is a water channel on the bottom, which comprises of asubmerged horizontal plate attached to the rear and side walls and the sea bottom. The new breakwater has another great advantage. It has a sufficient sheltering effect for incoming waves and also has a great deal of wave energy dissipationfunction to reduce reflected waves from the breakwater. In this study, we have examined effective cross sections of the new breakwater for wave sheltering as well as unidirectional current excitation.
