Numerical Model for Cross-shore Distribution of Longshore Sediment Transport Rate Including Suspended and Bed Loads in and outside the Surf Zone

Abstract

A one-dimensional numerical model for predicting the cross-shore distribution of the longshore sediment transport rate was developed. The model predicts the suspended load due to wave breaking and bed load due to longshore current velocity and velocity skewness and atiltness. The model validity was examined for steady flows and for waves and wave-induced longshore currents. The sediment transport rates for steady flows estimated by the present model agreed with those by Ribberink's formula. The total longshore sediment transport rates estimated by the present model were smaller than those estimated by CERC's formula. However, because CERC's formula was found to overestimate the total longshore sediment transport rate, the present model likely predicts the longshore sediment transport in the field properly.