Abstract
Longshore current velocities measured once a day for 15 years with intervals of about 50 m along the 400-meter-long pier of Hasaki Oceanographical Research Station (HORS) were analyzed. The direction of the predominant longshore current velocity near the shore was opposite to that offshore. The causes of the cross-shore distribution of the predominant longshore current velocity were investigated with the offshore wave height and the alongshore component of the wind velocity.