SCSIO OpenIR  > 热带海洋环境国家重点实验室(LTO)
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
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
Volume122Issue:2Pages:1555-1573
AbstractA 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.
Department[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
Funding ProjectLTO
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/16430
Collection热带海洋环境国家重点实验室(LTO)
Corresponding Authorcaisq@scsio.ac.cn
Recommended Citation
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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