Numerical study of infragravity waves amplification during harbor resonance

OCEAN ENGINEERING

卷:116

Article

Gao, Junliang^1,2,3  Ji, Chunyan¹  Gaidai, Oleg¹  Liu, Yingyi⁴ 

[1] Jiangsu Univ Sci & Technol, Sch Naval Architecture & Ocean Engn, Zhenjiang 212003, Peoples R China

[2] Jiangsu Univ Sci & Technol, Jiangsu Key Lab Adv Design & Mfg Technol Ship, Zhenjiang 212003, Peoples R China

[3] Hohai Univ, Jiangsu Key Lab Coast Ocean Resources Dev & Envir, Nanjing 210098, Jiangsu, Peoples R China

[4] Kyushu Univ, Appl Mech Res Inst, Kasuga, Fukuoka 8168580, Japan

关键词: Harbor resonance;    Boussinesq model;    Bound infragravity waves;    Free infragravity waves;    Wave groups;   

DOI  :  10.1016/j.oceaneng.2016.02.032

来源: Elsevier

【 摘 要 】

The infragravity (IG) period oscillations inside an elongated rectangular harbor excited by bichromatic wave groups are simulated using a fully nonlinear Boussinesq model. Based on an IG wave analysis technique, this study presents a comprehensive investigation on how bound and free IG waves and their relative components change with respect to the amplitudes and wavelengths of incident primary (short) waves under the condition of the lowest four resonant modes. For the given harbor and ranges of wavelength and amplitude of the primary waves studied in this paper, it is shown that the amplitudes of both the bound and free IG waves become more evident when the short wavelengths increase, and the latter are always larger than the former due to resonant amplification. The amplitudes of both the bound and free IG waves change quadratically with the amplitudes of the incident short waves. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

Free