筑堤影响下岛礁三维波浪传播变形规律SWASH数值模拟研究

3D wave propagation deformation law of island reef affected by embankment buildings by SWASH numerical simulation

为了探究筑堤对岛礁系统内波浪传播变形的影响,利用非静压波浪模型SWASH对三维岛礁模型试验数据进行验证对比,继而在岛礁上方不同位置建立不同长度的防波堤进行波流模拟。结果表明:礁坪特征断面内的波高随筑堤无明显变化,增减水则随筑堤变化明显,堤长越长、堤距越大,堤前增水越大,增水范围越广;裂口特征断面内的波高和增减水随筑堤均有明显变化,堤长越长、堤距越小,断面内波高越小,增减水越稳定。研究成果可为类似礁顶工程建设提供参考。

To explore the influence of embankment on wave propagation deformation in the island reef system,we use the non-hydrostatic wave model SWASH to verify and compare the three-dimensional island reef model test data,and then build breakwaters with different lengths at different positions above the island reef for wave current simulation.The results show that the wave height in the characteristic section of reef flat does not change obviously with the construction of embankment,but the increase and decrease of water changes obviously with the construction of embankment.The longer the embankment length and the larger the embankment distance,the greater the water increase in front of the embankment and the wider the range of water increase.The wave height and increase decrease water in the fracture characteristic section change obviously with the embankment construction.The longer the embankment length and the smaller the embankment distance,the smaller the wave height in the section,and the more stable the increase decrease water.The research results can provide reference for similar reef top engineering constructions.