板-网结构浮式防波堤消浪性能的试验研究

EXPERIMENTAL STUDY ON WAVE DISSIPATION COEFFICIENT FOR BOARD-NET FLOATING BREAKWATER

水深较大时,固定式防波堤不再适用,而相比之下,浮式防波堤具有轻便、机动、经济及良好的海水交换功能等特点。因此为保障深水养殖网箱在风浪中的安全,采用浮式防波堤进行掩护是唯一可行的工程措施。提出了一种新型的浮式防波堤结构型式——板-网浮式防波堤。通过实验室物理模型试验,研究波浪周期、平板宽度、网衣数目、平板刚度以及水流方向和速度对波浪透射系数的影响。试验采用规则波浪,水深为20m,波高为2.5m、4.5m和6.0m,周期为6s～10s。试验结果表明,采用该种浮式防波堤具有较好的消浪效果,但具体参数需根据当地波浪、水流条件而定。

In the area where water depth is large that excludes the use of a bottom-fixed structure, floating breakwater is the option due to its light weight, mobility, economics, and water exchange capacity. Floating breakwater also protects deep-water fish cages against severe waves and currents. A original floating breakwater -board-net floating breakwater was physically investigated in laboratory. The relationships between the wave dissipation coefficient and the wave period, board width, net number, board stiffness, and current direction and velocity were investigated. Regular waves of height 2.5, 4.5 and 6.0 m with periods ranging from 6.0 to 10.0 seconds were used. The water depth was 20 m. The results show that the proposed breakwater has good wave dissipation capacity, but its design parameter should be considered according to the wave and current conditions in the vicinity of the breakwater.