杭州湾海域50年一遇波浪数值模拟研究

杭州湾外围海域岛礁众多,波浪传播机制复杂。为了了解该海域的波浪分布特征,采用MIKE 21 SW模块建立了杭州湾海域波浪数值模型,利用实测波浪资料对模型进行了验证,结果表明该模型适用于模拟杭州湾海域的波浪传播。利用1970—2002年嵊山海洋站实测极值波浪资料推算50年一遇波浪要素,将其作为模型边界条件,对杭州湾海域50年一遇的设计波浪进行了模拟,并对该海域的波浪传播特征进行了分析。结果表明,杭州湾内波高较之外海明显减小,外围众多岛礁起到了很好的遮挡保护作用。

Numerical simulation research of wave with a return period of 50 years in the Hangzhou Bay

There are many islands and reefs out of the Hangzhou Bay, and the wave propagation mechanism is complex. In order to understand characteristics of wave distribution of the sea area, MIKE 21 SW module was used to establish a numerical model of wave for the Hangzhou Bay, and the model was validated with the observed wave data. The extreme wave data of Shengshan Marine Observation Station between 1970—2002 was used to calculate wave elements with a return period of 50 years, as the boundary conditions of the model. And then, the designed wave with a return period of 50 years in the Hangzhou Bay was simulated, while the characteristics of wave propagation was also analysed. The results show that the model is suitable to simulate the wave propagation in the Hangzhou Bay. Comparing with the wave height of the open sea, the wave height in the Hangzhou Bay is significantly smaller, and it is assumed that many islands and reefs outside of the Hangzhou Bay may play very good protection functions.