Experiments on mixing and dissipation in internal solitary waves over two triangular obstacles |
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Authors: | Chen-Yuan Chen John R-C Hsu Ming-Hung Cheng Cheng-Wu Chen |
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Institution: | (1) Department of Management Information System, Yung-Ta Institute of Technology and Commerce, Lin-Luoh, Pingtung County, 90941, Taiwan, ROC;(2) Department of Marine Environment and Engineering (also APORC), National Sun Yat-sen University, Kaohsiung, 80424, Taiwan, ROC;(3) School of Civil and Resource Engineering, University of Western Australia, Nedlands, WA, 6009, Australia;(4) Department of Logistics Management, Shu-Te University, Kaohsiung, 82445, Taiwan, ROC |
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Abstract: | A series of laboratory experiments was undertaken in a stratified two-layer fluid to investigate the energetics of the interaction
between an internal solitary wave (ISW) and triangular obstacles, as well as to determine the partitioning of ISW energy and
its subsequent dynamics. The ISW energy was dissipated as a result of internal breaking and turbulent mixing induced by wave
instability. Tests involving different combinations of triangular obstacles in various heights and intervals and ISW of different
amplitudes were performed. The wave features resulting from the interaction of an ISW and double obstacles were found to differ
from those of single obstacle. The incident energy of an ISW was either reflecting back from the obstacles, dissipated through
turbulent mixing, or transmitted over the double obstacles. Reduction in wave energy increased as the intervals between obstacles
reduced. For two obstacles in different heights, energy dissipation was greater in the case with a higher obstacle ahead of
a lower one. However, the overall performance was dependent on the relative height of the obstacles, relative water depth
of the upper and bottom layer, in addition to the intervals between the obstacles. |
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Keywords: | Internal solitary wave Laboratory experiments Energy dissipation Submerged obstacles Wave transmission |
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