This paper discusses the characteristics of wave fields around the Double Barriers Floating Breakwater (DBFB) which is proposed as a new floating breakwater against wind waves or ship waves in a marina. The DBFB has a rectangular body and double vertical plates to make energy dissipation with vortex flow around the tip of plates. The current study has been attempted to analyze experimentally and numerically some of the wave fields around the DBFB. It is found that the DFBF is much more effective as a breakwater than the simple rectangular floating breakwater by hydraulic model tests. Moreover it is found that the vertical motion of the DBFB is smaller than the simple rectangular floating breakwater. The numerical analysis is performed, based on two dimensional linear potential theory and an energy loss model by the vertical motion of the DBFB. The numerical results have good agreement with hydraulic model test.
