Numerical Simulation of 3D Morphodynamics around River-mouth using Quasi-3D Nearshore Current Model

Abstract

A numerical 3D morphodynamic model for predicting beach evolutions around river-mouth, which is based on the quasi-3D nearshore current model, was presented. The morphodynamic model takes into account the sediment transport rate in the run-up region and shoreline changes. The model applied to the formations of sand spits due to wave-induced currents, river-terrace due to river flows and off-shore sand bar in front of river-mouth under stormy wave condition. The computed results were compared with the conventional morphodynmic patterns around river-mouth. It was found that the presented model gave qualitatively agreements with the morphgodynamic patterns in previous studies.