Abstract
A numerical model for 3-D beach deformation has been developed to evaluate the amount of sediment transport rate in the littoral drift system. The model includes the sediment transport rate formula under the coexistence of waves and currents, considering the effect of bottom slope on the sediment movement. In case of a longshore uniform beach, this model has a solution that total amount of littoral drift is proportional to the longshore component of wave energy flux, similar to existing longshore sediment transport rate formulas. Numerical calculations are conducted to estimate the trapping rates of longshore sediment transport due to a groin or detached breakwater. Furthermore, wave height distributions of irregular wave and bottom friction components in nearshore zone are calculated to evaluate the sediment transport rate vector and total longshore sediment discharge on a bar type beach with a longshore undulation.
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