Beach managements for the land protection or the tidal flat development require more realistic predictions of waves and currents around shore facilities because of the construction of the cost-effective and environs-uninfluential facility.
This paper presents a numerical model for 2DH wave induced current. The numerical result of the longshore current induced by obliquely incident waves on a constant slope is tested with an existing experiment result. The numerical results of flow patterns around a groin show that twice of the surfzone width is affected by the large groin in upstream side, and three times of the surfzone width plus sheltered-area width behind the groin is affected in downstream side.