Experimental investigation of the load exerted by nonstationary internal solitary waves on a submerged slender body over a slope |
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| Institution: | 1. College of Meteorology and Oceanography, University of Science and Technology, Nanjing 211101, China;2. State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China;1. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing, China;2. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, China;3. College of Water Conservancy and Ecological Engineering, Nanchang Institute of Technology, Nanchang, China;4. College of Meteorology and Oceanography, National University of Defense Technology, Nanjing, China;5. Department of Civil Engineering, National Chung Hsing University, Taiwan, China;1. Department of Maritime Information and Technology, National Kaohsiung Marine University, Kaohsiung 80543, Taiwan, ROC;2. Institute of Physics, Academia Sinica, Taipei 11529, Taiwan, ROC;3. Department of Marine Environment and Engineering, National Sun Yat-sen University, Kaohsiung 80424, Taiwan, ROC;4. Department of System Engineering and Naval Architecture, National Taiwan Ocean University, Keelung 20224, Taiwan, ROC;5. School of Civil, Environmental and Mining Engineering, University of Western Australia, Crawley WA 6009, Australia;1. Department of Maritime Information and Technology, National Kaohsiung Marine University, Kaohsiung 80543, Taiwan, ROC;2. Institute of Physics, Academia Sinica, Taipei 11529, Taiwan, ROC;3. Department of Marine Environment and Engineering, National Sun Yat-sen University, Kaohsiung 80424, Taiwan, ROC;4. Department of System Engineering and Naval Architecture, National Taiwan Ocean University, Keelung 20224, Taiwan, ROC;5. School of Civil and Resource Engineering, University of Western Australia, Crawley, WA 6009, Australia;1. Department of Ocean and Resources Engineering, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, Honolulu, HI 96822, USA;2. Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province, Changsha, Hunan 410114, China;3. School of Hydraulic Engineering, Changsha University of Science and Technology, Changsha, Hunan 410114, China;1. CAS Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Beijing, 100190, China;2. School of Engineering Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;3. State Key Laboratory of Ocean Engineering, Shanghai Jiaotong University, Shanghai, 200240, China |
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| Abstract: | Laboratory experiments are performed in a large stratified fluid flume to examine the characteristics of the load on a submerged slender body that is exerted by a nonstationary internal solitary wave (ISW) from its interaction with a gentle slope. The nonstationary ISW over the slope and its load on the body are measured by using multi-channel conductivity-probe arrays and a specially designed force measurement device, respectively, and the body’s vertical and horizontal positions on the load are determined by analyzing the effects of the incident ISW’s amplitude. The experimental results show that the load on the slender body increases as the incident ISW’s amplitude increases; additionally, the effect of oscillations is enhanced because of the ISW’s distortion, breaking and fission. The oscillating action from fission waves becomes dominant as the amplitude reaches a certain value. Additionally, the load is correlated with body’s vertical position relative to the pycnocline. The magnitudes of the vertical and horizontal forces reach a maximum and minimum in the pycnocline, respectively, and the horizontal force in this direction is the opposite above and below the pycnocline. Compared to a case without a slope, the load on the slender body increases because of the nonstationary ISW, and its effect on the maximum force is transferred to the pycnocline. When the body’s horizontal position is located close to the top of the slope, the direction of the horizontal and vertical forces remains consistent, but its acting time becomes longer. In addition, high-frequency actions on the slender body are impacted by nonstationary ISWs near the slope’s top. |
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| Keywords: | Nonstationary internal solitary waves Stratified fluid Wave evolution Slender body’s load Gentle slope |
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