Sand Suction Characteristics in the Rear Side of a Revetment Using DEM-WASS-2D

Abstract

The coupled analysis of a particle method and a wave field model was conducted to examine numerically the characteristics of sand behaviors at the bottom and in the rear side of a revetment. The two-way coupled analysis used in this study can not only consider the interaction among the wave, revetment, and ground but also represent sand behaviors at the bottom and in the rear side of a revetment under waves. The validity and usefulness of the two-way coupled analysis was ensured by comparing hydraulic characteristics around an impermeable revetment with the results of a hydraulic model experiment. In the coupled analysis, characteristics of sand behaviors at the bottom and in the rear side of a revetment were numerically analyzed according to the installation of an incident wave and submerged breakwater. As the wave energy increased, the sand transport from the bottom of the revetment also increased. The transport rates of sand from the bottom of the revetment to the open sea decreased by 14-93% when a submerged breakwater was installed under the tidal condition of this study. In addition, the two-way coupled analysis was also effective in numerically examining the stability of the bottom and rear side of a revetment according to the characteristics of sand behaviors.