Generation of internal solitary waves over a large sill: From Knight Inlet to Luzon Strait
Chen, ZW; Nie, YH; Xie, JS; Xu, JX; He, YH; Cai, SQ; caisq@scsio.ac.cn
2017
发表期刊JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
卷号122期号:2页码:1555-1573
摘要A fully nonlinear, nonhydrostatic numerical model is utilized to investigate the generation of Internal Solitary Waves (ISWs) upstream of the Knight Inlet sill. While an upstream hydraulic jump initiates the ISW generation and both hydraulic jump and upstream influence contribute to the generation, it is found that upstream influence is dominant and the hydraulic jump is not necessary for the ultimate generation of ISWs. Decreasing the tidal forcing or upstream sill width may render the flow subcritical (i.e., the hydraulic jump disappears) and ISWs can be generated by nonlinear steepening of long wave disturbances induced by upstream influence. Increasing the tidal forcing or upstream sill width may generate a hydraulic jump blocking strong upstream propagating disturbances. The jump subsequently becomes a turbulent bore and later disperses into a train of ISWs as the tide relaxes. Further increase in the tidal forcing may sweep the turbulent bore downstream and a train of ISWs is emitted upstream toward the end of waning tide. By reducing the stratification strength by 1 order of magnitude, the near-sill flow is in the transcritical regime and ISWs are resonantly generated over the lee side slope. Connections to the internal tide release mechanism at Luzon Strait and to the unsteady lee wave model are also discussed. The present work provides some more insights into the ISW generation process at Knight Inlet and the connection between the generation mechanism at Knight Inlet and that at Luzon Strait is identified.
部门归属[Chen, Zhiwu; Xie, Jieshuo; Xu, Jiexin; He, Yinghui; Cai, Shuqun] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China; [Nie, Yuhua] State Ocean Adm, South China Sea Branch, Guangzhou 510300, Guangdong, Peoples R China
资助项目LTO
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/16430
专题热带海洋环境国家重点实验室(LTO)
通讯作者caisq@scsio.ac.cn
推荐引用方式
GB/T 7714
Chen, ZW,Nie, YH,Xie, JS,et al. Generation of internal solitary waves over a large sill: From Knight Inlet to Luzon Strait[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2017,122(2):1555-1573.
APA Chen, ZW.,Nie, YH.,Xie, JS.,Xu, JX.,He, YH.,...&caisq@scsio.ac.cn.(2017).Generation of internal solitary waves over a large sill: From Knight Inlet to Luzon Strait.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,122(2),1555-1573.
MLA Chen, ZW,et al."Generation of internal solitary waves over a large sill: From Knight Inlet to Luzon Strait".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 122.2(2017):1555-1573.
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