Abstract
Relations between water surface displacement and the breakwater heights were discussed in our previous study, and also breakwater height that exerts a remarkable influence to wave motion is clarified. In this paper, relation between these wave motion and characteristics of the wave current around wall-type vertical breakwater was investigated experimentally. In the experiments, the wave due to current around a vertical breakwater were measured by PTV. And the characteristics of inner flow mechanism, velocity vector and vorticity distribution near by breakwater were examined. Thereupon, the growth and dissipation processes of eddy motions which contribute to the dispersion of wave energy were elucidated and at same time, the relationship between vorticity and wave energy dissipation was clarified.
