Abstract
The effect of wave-induced mass transport in the bottom boundary layer on the net transport of sheetflow was investigated by a two-phase flow model expanded for the cross-shore direction. The net sand transport rate was found to increase significantly due to the presence of steady streaming. The increase in the local sand transport rate was successfully estimated by existing sand transport models by including the steady streaming as superimposed currents. The model was then applied to the sheet flow transport in the outer surf zone for large wave tank experiments, which improved the prediction of bar generation near the breaker zonei.