振荡水柱式防波堤的水动力特性

Hydrodynamic characteristics of oscillating water column type breakwater

提出一种带水平底板的振荡水柱式新型防波堤.借助二维物理波浪水槽,研究结构系统在3种不同水平底板宽度、12种不同波浪周期下的水动力特性.通过实验探究波高对防波堤模型相关水动力参数的影响.结果表明:合理布置水平底板能有效提升振荡水柱式防波堤的阻波性能;当水平底板宽度等于模型板间宽度时,入射波周期小于1.6 s的波浪的透射系数小于0.5;当水平底板宽度增大到2倍模型板间宽度时,入射波周期小于2.2 s的波浪的透射量小于50%.水平底板的存在增加了系统的能量耗散,提高了系统对长波区间波浪的阻挡性能;波高的变化对相关水动力参数影响不大.

An advanced oscillating-water-column-type(OWC-type) breakwater with a horizontal underneath plate was proposed. The hydrodynamic characteristics of the system under three different plate breadths and twelve different wave periods were studied using two-dimensional laboratory experiments. The effect of wave height on the hydrodynamic parameters of the breakwater model was explored by experiments. The experimental results show that the wave-damping ability of the breakwater was improved by setting the underneath plate reasonably: the transmission coefficient for incident wave periods within 1.6 s was less than 0.5, as the horizontal bottom plate width was equal to the width between the model plates;the wave transmission was less than 50% for incident wave periods within 2.2 s, as the horizontal bottom width was increased to twice the width between the model plates. The presence of the underneath plate is beneficial for the energy dissipation, which particularly improves the performance of the breakwater for the long-wave regimes. The change of wave height has little effect on the relevant hydrodynamic parameters.