Numerical study of low-frequency waves during harbor resonance
Numerical study of low-frequency waves during harbor resonance
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DOI：
10.1016/j.oceaneng.2013.04.020
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发表时间：
2013-08
影响因子：
5
通讯作者：
G. Dong;Junliang Gao;Xiaozhou Ma;Gang Wang;Yuxiang Ma
中科院分区：
文献类型：
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作者：
G. Dong;Junliang Gao;Xiaozhou Ma;Gang Wang;Yuxiang Ma
本文的目的是研究如何束缚和自由长波和它们的相关成分相对于短波长的变化时，共振发生在一个狭长的矩形港口。用Boussinesq模型模拟了双色波激发的长周期振荡。提出了一种将港内低频分量分解为束缚长波和自由长波的分离方法。为了比较，还考虑了非共振波条件。结果表明，无论港口是否共振，束缚长波和自由长波的振幅及其比值都与短波密切相关。在给定的港内和主波频率范围内，当港内处于最低共振模态时，束缚长波的振幅总是小于自由长波的振幅，但当平均短波长大于0.66倍港长时，束缚长波的振幅往往大于自由长波的振幅的一半。当港口为非共振时，平均短波长大于0.56倍港长时，前者比后者大。
The aim of this paper is to investigate how bound and free long waves and their relative components change with respect to short wavelengths when resonance occurs in a long and narrow rectangular harbor. Long-period oscillations excited by bichromatic primary waves are simulated using the Boussinesq model. A separation procedure is proposed to decompose the low-frequency components inside the harbor into bound and free long waves. For comparison, the non-resonant wave condition is also considered. It shows that the amplitudes of bound and free long waves and their ratio are closely related to the short wavelengths, regardless of whether the harbor is resonant or not. For the given harbor and primary wave frequency ranges studied in this paper, when the harbor is at the lowest resonant mode, the amplitudes of bound long waves are always lower than those of free long waves but tend to be larger than half of the latter when the average short wavelengths are larger than 0.66 times the harbor length. When the harbor is non-resonant and the average short wavelengths are larger than 0.56 times the harbor length, the former is inclined to be larger than the latter.