孤立波作用下细长港响应的数值研究

Numerical study on the response of a narrow-long harbor to a solitary wave

采用Boussinesq数值波浪模型,模拟了不同波高的孤立波分别对常水深和变水深细长港作用时港内的响应。对数值模型的结果进行小波分析和频谱分析并与现有的理论值比较。结果表明,孤立波传入一侧为开敞水域的细长港时,港内激发振荡的能量主要集中在细长港前三个自振模态上,港口的响应频率与理论固有频率非常接近,这为估算细长港池的固有频率提供了一种可行性方法。

The response of a narrow-long harbor to an incident solitary wave is simulated by a Boussineq wave model. Both horizontal and sloping bottoms are studied. The comparison between the numerical results and theory as well as the spectral analysis is conducted, which indicates that most of the energy of the harbor response is at the first three natural frequencies when a solitary wave enters into a narrow harbor with a side of open waters. It shows a good agreement between the numerical and theoretical results,suggesting a possible method to estimate the natural frequencies of a narrow-long harbor.