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学科主题: Meteorology & Atmospheric Sciences ; Oceanography
题名: Energetics of nonlinear internal waves generated by tidal flow over topography
作者: [Chen, Zhi-Wu ; Xie, Jieshuo ; Xu, Jiexin ; Cai, Shuqun] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China ; [Xu, Jiexin] Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China ; [Zhan, Jie-Min] Sun Yat Sen Univ, Dept Appl Mech & Engn, Guangzhou 510275, Guangdong, Peoples R China
通讯作者: caisq@scsio.ac.cn
关键词: Barotropic tides ; Internal waves ; Solitons ; Energy budget
刊名: OCEAN MODELLING
发表日期: 2013
卷: 68, 页:1-8
部门归属: LTO
资助者: This work was jointly supported by the Knowledge Innovation Program of the Chinese Academy of Sciences (No. SQ201107), National Basic Research Program (Nos. 2011CB013701 and 2013CB956101), Guangdong Natural Science Foundation (No. S2012040008082) and NSFC Grant No. 41025019.
摘要: An in-house fully nonlinear, nonhydrostatic numerical model is utilized for simulations of internal solitary waves (ISWs) generated by tidal flows over a Gaussian sill topography. A complete, rigorous theoretical framework is then adopted for the energetics analysis of these ISWs. The ratio of topographic amplitude to the total water depth is fixed, and the tidal excursion parameter (epsilon) and slope parameter (gamma) are varied by changing the imposed barotropic velocity and the horizontal scale of the topography. It is found that the energy input, conversion, and radiation rates all increase monotonically with epsilon. They peak when the bottom topography is critical (gamma - 1). The energy input is generated by the pressure difference across the domain. The energy conversion rate in percentage (normalized by the corresponding input rate) decreases almost linearly as epsilon increases. The larger the slope parameter, the higher the conversion percentage. The baroclinic radiation rate in percentage (normalized by the corresponding conversion rate) increases first and then decreases as e increases. It gets maximum near epsilon = 0.15, which corresponds to the emergence of ISWs in the flow field. The larger the slope parameter, the smaller the radiation percentage. At small epsilon value when the flow field is in the linear internal tide regime, the conversion and radiation percentages all agree very well with the results in existing literature (Kang and Fringer, 2012) for the Davidson Seamount. The barotropic and baroclinic dissipation percentages behave very differently. While the barotropic one is larger for smaller c, the baroclinic one is larger for larger gamma. The present work presents a relatively complete energy budget analysis of ISWs generated by tidal flow over a Gaussian sill topography. (C) 2013 Elsevier Ltd. All rights reserved.
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000320606500001
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10897
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[Chen, Zhi-Wu; Xie, Jieshuo; Xu, Jiexin; Cai, Shuqun] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China; [Xu, Jiexin] Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China; [Zhan, Jie-Min] Sun Yat Sen Univ, Dept Appl Mech & Engn, Guangzhou 510275, Guangdong, Peoples R China.Energetics of nonlinear internal waves generated by tidal flow over topography,OCEAN MODELLING,2013,68():1-8
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