The characteristic of waves and currents around a submerged breakwater is studied by a large scale three-dimensional experiment. The wave height decreases on the submerged breakwater by plunging breaker.The wave heights measured in laboratory simulation are compared with those estimated in numerical models.The comparison demonstrates the applicability of the Boussinesq model to estimate wave profiles on the submerged breakwater. The experimental formula for the wave height estimation is also proposed. The velocity of the steady current at the backward of the submerged breakwater is much larger than that at the forward. The large current may occur the serious scoring.
