On generation and evolution of seaward propagating internal solitary waves in the northwestern South China Sea

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 热带海洋环境国家重点实验室(LTO)

	On generation and evolution of seaward propagating internal solitary waves in the northwestern South China Sea
	Xu, Jiexin; Chen, Zhiwu; Xie, Jieshuo; Cai, Shuqun
刊名	COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
	2016
卷号	32 页码:122-136
关键词	Internal solitary waves Numerical model Korteweg-de Vries theory South China Sea
通讯作者	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.
中文摘要	In 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.
学科主题	Mathematics; Mechanics; Physics
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/15560]
专题	南海海洋研究所_热带海洋环境国家重点实验室(LTO)
推荐引用方式 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.(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.