A Model Study on the Generation of Internal Tides by Tidal Flows Over a Submerged Seamount in the Channel
Cai, SQ; Liu, JH; Long, XM; caisq@scsio.ac.cn; lerry710@scsio.ac.cn; xmlong@scsio.ac.cn
2010
发表期刊COMMUNICATIONS IN COMPUTATIONAL PHYSICS
ISSN1815-2406
卷号8期号:1页码:95-114
摘要It is known that the submerged seamount/ridge is a source for the generation of internal tides. In this paper, a three-dimensional two-layer model is set up to study the generation of internal tides by tidal flows over a submerged seamount/ridge in the channel. Several numerical experiments with different topographic features, upper layer depths, tidal flows and background currents are carried out to study the variations of the induced internal tides. It is shown that, for the specific stratification, the seamount feature, the slope, the initial upper layer depth and the imposing driven force determine the Froude number near the seamount peak. Once when the Froude number is supercritical, the associated maximum amplitude of the induced internal tide is so large that the internal tide begins to disintegrate, which brings about severe variations of the current velocity and the water elevation fields, and the associated induced baroclinic tidal energy around the seamount peak is much larger than the barotropic one. The Richardson number greater than 1/4 is a criterion for stability of shear flow. Since the maximum tidal velocity changes within 0 similar to 360 degrees with time in a period around the seamount peak, the induced internal tide does not stride the seamount peak before it disintegrates, which is different from the two-dimensional modeled results. The asymmetrical slope of the submerged seamount is a mechanism for the asymmetrical internal tide generation.
部门归属[Cai, Shuqun; Liu, Junhang; Long, Xiaomin] Chinese Acad Sci, S China Sea Inst Oceanol, LED, Guangzhou 510301, Guangdong, Peoples R China; [Liu, Junhang] Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
关键词Internal Tides Numerical Modeling Two-layer Model Sill Channel
学科领域Physics, Mathematical
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收录类别sci
资助项目LED
WOS记录号WOS:000278713500003
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文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/6291
专题热带海洋环境国家重点实验室(LTO)
通讯作者caisq@scsio.ac.cn; lerry710@scsio.ac.cn; xmlong@scsio.ac.cn
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Cai, SQ,Liu, JH,Long, XM,et al. A Model Study on the Generation of Internal Tides by Tidal Flows Over a Submerged Seamount in the Channel[J]. COMMUNICATIONS IN COMPUTATIONAL PHYSICS,2010,8(1):95-114.
APA Cai, SQ,Liu, JH,Long, XM,caisq@scsio.ac.cn,lerry710@scsio.ac.cn,&xmlong@scsio.ac.cn.(2010).A Model Study on the Generation of Internal Tides by Tidal Flows Over a Submerged Seamount in the Channel.COMMUNICATIONS IN COMPUTATIONAL PHYSICS,8(1),95-114.
MLA Cai, SQ,et al."A Model Study on the Generation of Internal Tides by Tidal Flows Over a Submerged Seamount in the Channel".COMMUNICATIONS IN COMPUTATIONAL PHYSICS 8.1(2010):95-114.
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