Development and Validation of a Wave-Action Model for Simulating Wave Attenuation due to Vegetation

摘要

This paper presents a wave-action model to simulate random wave deformation and transformation through a vegetation zone. The energy loss due to vegetation resistance is modeled by the vegetation drag model for random wave conditions. Based on a directional wave action balance equation, the wave energy dissipation effect due to vegetation is implemented into an integrated coastal process model, CCHE2D-Coast. The newly developed capability in the model for simulation of wave transformations through a vegetation field is validated by computing wave heights in two laboratory experiments which were conducted in wave flumes with planted artificial vegetations. The effects of wave breaking and vegetation resistance are investigated in the cases with artificial vegetation planted on a beach (slope 1:30). Numerical results of wave heights show that this wave-action model is capable of simulating very well wave energy dissipations due to vegetation resistance and wave breaking.