Modelling the propagation of an internal solitary wave across double ridges and a shelf-slope |
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Authors: | Ming-Hung Cheng John R-C Hsu Chen-Yuan Chen Cheng-Wu Chen |
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Institution: | (1) Department of Marine Environment and Engineering (and APORC), National Sun Yat-sen University, Kaohsiung, 80424, Taiwan, ROC;(2) Department of Management Information System, Yung-Ta Institute of Technology and Commerce, Lin-Luoh, PingTung County, 90941, Taiwan, ROC;(3) Department of Logistics Management, Shu-Te University, Kaohsiung, 82445, Taiwan, ROC;(4) School of Civil and Resource Engineering, The University of Western Australia, Perth, WA, 6009, Australia |
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Abstract: | Evolution of the internal solitary waves (ISWs) in the northern South China Sea (SCS) has recently attracted the attention
of many oceanographers in Taiwan and the United States. These ISWs are believed to have been induced by a branch of the Kuroshio
current over Luzon Strait, which propagates westward over two ridges in the Luzon Strait between Taiwan and the Philippines,
and further onto the continental margin with a shelf-slope in the SCS. This paper presents some preliminary results for the
evolution of a depression ISW across two triangular obstacles using numerical modelling and laboratory experiments. The experimental
results confirm that the intervals and relative height between the two obstacles are important factors in the interaction
of an ISW with the obstacles. However, in the case of the movement of an ISW of depression-type across the Luzon Strait, the
effect of the two ridges on the characteristics of the ISW might be less significant than that from the shelf-slope, due to
the variations in relative water depth. Results from numerical experiments also show that the amplitude of an ISW can be augmented
once the wave commences its contact with a shelf-slope, where an internal hydraulic jump and wave breaking with vortex motion
are evident in the laboratory experiments. Eventually, an ISW of depression-type could become an elevation-type at the edge
of the continental shelf landwards beyond the turning point, where the upper layer is larger than the bottom layer in a stratified
water column. |
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Keywords: | Internal solitary wave South China Sea Double obstacles Laboratory experiments Numerical model Turning point Internal hydraulic jump Wave breaking |
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