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On generation and evolution of seaward propagating internal solitary waves in the northwestern South China Sea
Xu, Jiexin; Chen, Zhiwu; Xie, Jieshuo; Cai, Shuqun; Cai, SQ (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, 164 West Xingang Rd, Guangzhou 510301, Guangdong, Peoples R China.
2016
Source PublicationCOMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
Volume32Pages:122-136
AbstractIn this paper, the generation and evolution of seaward propagating internal solitary waves (ISWs) detected by satellite image in the northwestern South China Sea (SCS) are investigated by a fully nonlinear, non-hydrostatic, three-dimensional Massachusetts Institute of Technology general circulation model (MITgcm). The three-dimensional (3D) modeled ISWs agree favorably with those by satellite image, indicating that the observed seaward propagating ISWs may be generated by the interaction of barotropic tidal flow with the arc-like continental slope south of Hainan Island. Though the tidal current is basically in east west direction, different types of internal waves are generated by tidal currents flowing over the slopes with different shaped shorelines. Over the slope where the shoreline is straight, only weak internal tides are generated; over the slope where the shoreline is seaward concave, large-amplitude internal bores are generated, and since the concave isobaths of the arc-like continental slope tend to focus the baroclinic tidal energy which is conveyed to the internal bores, the internal bores can efficiently disintegrate into a train of rank-ordered ISWs during their propagation away from the slope; while over the slope where the shoreline is seaward convex, no distinct internal tides are generated. It is also implied that the internal waves over the slope are generated due to mixed lee wave mechanism. Furthermore, the effects of 3D model, continental slope curvature, stratification, rotation and tidal forcing on the generation of ISWs are discussed, respectively. It is shown that, the amplitude and phase speed of ISWs derived from a two-dimensional (2D) model are smaller than those from the 3D one, and the 3D model has an advantage over 2D one in simulating the ISWs generated by the interaction between tidal currents and 3D curved continental slope; the reduced continental slope curvature hinders the extension of ISW crestline; both weaker stratification and rotation suppress the generation of ISWs; and the width of ISW crestline generated by K-1 tidal harmonic is longer than that by M-2 tidal harmonic. (C) 2015 Elsevier B.V. All rights reserved.
Department[Xu, Jiexin; Chen, Zhiwu; Xie, Jieshuo; Cai, Shuqun] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China; [Xu, Jiexin; Xie, Jieshuo] Univ Chinese Acad Sci, Beijing 100049, Peoples R China ; LTO
KeywordInternal Solitary Waves Numerical Model Korteweg-de Vries Theory South China Sea
Subject AreaMathematics ; Mechanics ; Physics
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/15560
Collection热带海洋环境国家重点实验室(LTO)
Corresponding AuthorCai, SQ (reprint author), Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, 164 West Xingang Rd, Guangzhou 510301, Guangdong, Peoples R China.
Recommended Citation
GB/T 7714
Xu, Jiexin,Chen, Zhiwu,Xie, Jieshuo,et al. On generation and evolution of seaward propagating internal solitary waves in the northwestern South China Sea[J]. COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION,2016,32:122-136.
APA Xu, Jiexin,Chen, Zhiwu,Xie, Jieshuo,Cai, Shuqun,&Cai, SQ .(2016).On generation and evolution of seaward propagating internal solitary waves in the northwestern South China Sea.COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION,32,122-136.
MLA Xu, Jiexin,et al."On generation and evolution of seaward propagating internal solitary waves in the northwestern South China Sea".COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION 32(2016):122-136.
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