Hydrodynamic performance of floating breakwaters in long wave regime: An experimental study
Hydrodynamic performance of floating breakwaters in long wave regime: An experimental study
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长波状态下浮动防波堤的水动力性能：实验研究
DOI：
10.1016/j.oceaneng.2018.01.055
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发表时间：
2018-03-15
影响因子：
5
通讯作者：
Gaidai, Oleg
中科院分区：
文献类型：
--
作者：
Ji, Chunyan;Cheng, Yong;Gaidai, Oleg
浮式防波堤长水波水动力特性试验是一些近礁海域的一项重要任务。特别是，当浮式防波堤的自然周期处于波浪频率范围内时，其性能变得更加复杂。本研究在长规则波浪作用下进行了一系列实验，研究了单箱、单多孔箱、双圆柱浮桥、带网笼和悬球的双圆柱浮桥四种松系浮式防波堤模型的水动力行为。实验结果表明，4个模型的波传输和波能耗散在长波区漂浮结构自然周期附近存在多个转折点，而反射系数则不明显。在四个模型的运动和系泊张力中也观察到了共振响应，这进一步解释了传输和耗散系数中出现的转折点现象。总体结果表明，多孔板和带球的网笼可有效缓解由于额外的水量和阻尼效应而导致的转折点现象，并且还具有减少运动和系泊力的潜力。
Hydrodynamic behavior test of long water waves with a floating breakwater is an important mission in some near reef sea areas. Especially, the performance of the floating breakwater becomes more complicated when its natural periods stay within the range of wave frequencies. In this study, a series of experiments were conducted under long regular wave actions to investigate the hydrodynamic behavior of four slack-moored floating breakwater models, including single box, single porous box, double cylindrical pontoon, double cylindrical pontoon with mesh cage and suspending balls. The experimental results revealed that the wave transmission and wave energy dissipation for four models had multiple turning points near the natural periods of floating structures in long wave regime, while which was not evident for the reflection coefficient. The resonant responses were also observed in the motions and mooring tensions of the four models, which further explained the turning point phenomenon that appeared in transmission and dissipation coefficients. The overall results demonstrated that the porous plates and mesh cage with balls were effective for mitigating the turning point phenomenon due to additional water mass and damping effects, and also held the potential for reducing the motions and mooring forces.