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Numerical study of low-frequency waves during harbor resonance

机译：港口共振过程中低频波的数值研究

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摘要

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.
机译：本文的目的是研究在狭长的矩形港口中发生共振时，束缚和自由的长波及其相对分量如何相对于短波长发生变化。使用Boussinesq模型模拟了由双色原波激发的长周期振荡。提出了一种分离程序，将海港内的低频分量分解为束缚波和自由长波。为了进行比较，还考虑了非谐振波条件。结果表明，无论海港是否共振，束缚和自由长波的振幅及其比率都与短波长密切相关。对于本文研究的给定海港和一次波频率范围，当海港处于最低共振模式时，束缚长波的振幅始终低于自由长波的振幅，但当自由长波的振幅往往大于自由长波的一半。平均短波长大于港湾长度的0.66倍。当港口是非谐振的，并且平均短波长大于港口长度的0.56倍时，前者倾向于大于后者。

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  • 来源
    《Ocean Engineering》 |2013年第1期|38-46|共9页
  • 作者

    Guohai Dong; Junliang Gao; Xiaozhou Ma; Gang Wang; Yuxiang Ma;

  • 作者单位

    The State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;

    The State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;

    The State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;

    College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, China;

    The State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Harbor resonance; Boussinesq model; Low-frequency waves; Bound long waves; Free long waves;

    机译：港口共鸣;Boussinesq模型;低频波;束缚的长波;自由长波;

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