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Wave interaction with a wave absorbing double curtain-wall breakwater

机译：波浪与吸收波浪的双幕墙防波堤的相互作用

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摘要

This study examines the hydrodynamic performance of a wave absorbing double curtain-wall breakwater. The breakwater consists of a seaward perforated wall and a shoreward impermeable wall. Both walls extend from above the seawater to some distance above the seabed. Then the below gap allows the seawater exchange, the sediment transport and the fish passage. By means of the eigenfunction expansion method and a least square approach, a linear analytical solution is developed for the interaction of water waves with the breakwater. Then the reflection coefficient, the transmission coefficient and the wave forces acting on the walls are calculated. The numerical results obtained for limiting cases agree very well with previous predictions for a single partially immersed impermeable wall, the double partially immersed impermeable walls and the bottom-standing Jarlan-type breakwater. The predicted reflection coefficients for the present breakwater also agree reasonable with previous experimental results. Numerical results show that with appropriate structure parameters, the reflection and transmission coefficients of the breakwater may be both below 0.5 at a wide range of the relative water depth. At the same time, the magnitude of wave force acting on each wall is small. This is significant for practical engineering.
机译：这项研究研究了吸收波浪的双幕墙防波堤的水动力性能。防波堤由向海的穿孔墙和向岸的不渗透墙组成。两堵墙都从海水上方延伸到海床上方一定距离。然后，下面的缝隙允许海水交换，沉积物输送和鱼通过。通过本征函数展开法和最小二乘方法，开发了用于水波与防波堤相互作用的线性解析解。然后计算反射系数，透射系数和作用在墙壁上的波浪力。在有限情况下获得的数值结果与以前对单个部分浸入的防渗墙，双重部分浸入的防渗墙和底部的Jarlan型防波堤的预测非常吻合。当前防波堤的预测反射系数也与先前的实验结果相吻合。数值结果表明，采用适当的结构参数，在较大的相对水深范围内，防波堤的反射系数和透射系数都可能低于0.5。同时，作用在各壁上的波浪力的大小较小。这对实际工程意义重大。

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