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A numerical study to determine the wave attenuation of wave height is presented. Coastal vegetation acts as a natural coastal defense structure and protects the coast from waves by reducing the energy of the waves. A three dimensional numerical wave tank model simulation is developed using open source computational Fluid Dynamics (CFD) software REEF3D and wave attenuation due to coastal vegetation is assessed. The numerical model is developed in a numerical wave tank for artificial rigid vegetation of 2 m meadow length. The model is tested for regular waves of height 0.08 m, 0.12 m and 0.16 m and different wave periods of 1.8 sec and 2 sec in different water depths of 0.40 m and 0.45 m, wave heights at different locations along the vegetation meadow is recorded. The performance of the numerical model is validated with the experimental results. The numerically obtained results using REEF3D are concurrent with the experimental results.


Coastal Vegetation, Numerical Model, Computational Fluid Dynamics (CFD), Wave Attenuation.
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