岛礁地形下新型浮式防波堤系统固有周期对消浪性能作用机制及堤后波浪演变规律研究

加快南海岛礁资源开发和利用是维护我国南海海洋权益的有力手段之一。浮式防波堤作为保障岛礁建设和开发过程中所需的掩护设施日益受到各方瞩目。然而，浮式防波堤透射系数与固有周期相互作用机理以及堤后有效掩护区域等问题尚未解决。本项目在先期取得的设计和研究成果基础上，对双浮体网箱桁架式浮式防波堤根据横向连接刚度建立多体防波堤-系泊系统组成的耦合运动方程；分析岛礁地形下浮式防波堤系统的整体水动力性能和堤后波浪的传播规律；通过物理模型试验检验所发展的耦合分析方法的正确性和防波堤自身运动特性对透射系数的影响。本项目旨在明确岛礁地形下浮式防波堤自身运动特性对透射系数影响机制和堤后波高变化规律，特别是透射系数随波周期变化曲线中峰值点出现原因，通过修订透射系数曲线峰值点进而提升浮式防波堤消波性能，具有重要的理论意义和工程应用价值。

To speed up the development and utilization of island resources in the South China Sea is one of the most effective ways to safeguarding the interests and rights. Floating breakwaters can offer an alternative to the island construction. In order to protect these structures from the violent environmental conditions, the studies on the floating breakwaters is becoming very critical. The floating breakwaters with net cage are supposed to be the most effective and low-cost type. Based on the framework established by the previous research, the numerical simulation and experiment test will be conducted, in order to investigate the hydrodynamic responses of the floating breakwater. The one aim of the present project is to clear the relationship among floating breakwater natural period, transmission coefficient and incident wave period. The other purpose of the present project is to predict the propagation of the waves along the breakwaters, in order to optimize the performance of floating breakwater and provide technical support for the development of the floating islets. This project aims to reveal the evolution mechanism of transmission coefficient and nature feature of floating breakwater, increase human's understanding of transmission coefficient, increase performance of floating breakwater and solve the problems of engineering design, which has theoretical significances and engineering application values.