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Analysis of vegetation effect on waves using a vertical 2-D RANS model

Weiming Wu, Mingliang Zhang, Yavuz Ozeren, Daniel Wren
Journal of coastal research 2013 v.29 no.2 pp. 383-397
Juncus roemerianus, Reynolds number, Spartina alterniflora, algorithms, calibration, coastal water, coasts, computer simulation, drag coefficient, equations, hydraulic flumes, hydrodynamics, mathematical models, model validation, momentum, surface water, turbulent flow, vegetation, water waves
A vertical two-dimensional (2-D) model has been applied in the simulation of wave propagation through vegetated water bodies. The model is based on an existing model SOLA-VOF which solves the Reynolds-Averaged Navier-Stokes (RANS) equations with the finite difference method on a staggered rectangular grid and uses the volume of fluid method to capture the free surface. The model is enhanced in this study by adding the drag and inertia forces in the momentum equations to account for the vegetation effects, implementing the sub-grid scale model for turbulence closure, and incorporating wave maker, sponge layer and bottom friction in boundary conditions. The model was first validated using measurement data collected from the literature, and then applied to simulate wave propagation in flumes covered by rigid and flexible model and live vegetation. The considered live vegetation species are Spartina alterniflora (smooth cord grass) and Juncus roemerianus (needlegrass rush), which are commonly distributed on coastlines. The model is able to reproduce wave attenuation through the vegetation zone observed in the experiments. The drag coefficients are calibrated in the vertical 2-D RANS model and also the analytical model based on the wave energy equation and linear wave theory, and the calibrated values in the two models are reasonably close.