Numerical study on performance of submerged permeable breakwater under impacts of multi-directional focused wave groups
In this study,a high-precision three-dimensional wave numerical flume is established using the non-hydrostatic model NHWAVE to simulate the wave dissipation characteristics of permeable and impermeable submerged breakwaters under the influence of multidirectional focused waves.The ability of the model to simulate the propagation of multidirectional focused wave generation and flow within porous media is verified by comparing the calculated results with experimental data,and the effects of different wave parameter conditions(significant wave height,water depth,peak wave period and spreading angle)are considered.The results show that the submerged breakwater has a significant effect on the maximum wave amplitude,maximum water level,maximum depth-averaged velocity and wave energy of the multi-directional focused waves,and the permeable submerged breakwater has better wave dissipation performance due to the presence of porous media.As the significant wave height increases,the wave breaking point at the top of the breakwater moves forward,and the wave attenuation of impermeable submerged breakwater is greatly influenced by wave height.With the increase of the water depth,the wave attenuation of submerged breakwater is lower.The permeable breakwater is less effective in long period wave attenuation.The smaller the spreading angle,the larger the wave amplitude at the focus,and the stronger the wave nonlinear effect.The research results can provide some reference for us to further protect coastal facilities from the impact of extreme marine environment.
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