Experimental and numerical investigation on the damping effect of net cages in waves |
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| Institution: | 1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;2. Qingdao Key Laboratory for Marine Fish Breeding and Biotechnology, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, China;3. Marine Science and Technology School, Zhejiang Ocean University, Zhoushan 316000, China;1. Department of Marine Technology, Norwegian University of Science and Technology (NTNU), Trondheim, NO-7491, Norway;2. Centre for Autonomous Marine Operations and Systems (AMOS), NTNU, Trondheim, NO-7491, Norway;3. CNR-INSEAN, Marine Technology Research Institute, Rome, Italy;4. Sintef Ocean, Trondheim, Norway;1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, 116024, China;2. National Marine Hazard Mitigation Service, State Oceanic Administration, Beijing, 100000, China;1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;2. Marine Science and Technology School, Zhejiang Ocean University, Zhoushan 316000, China;1. Tokyo University of Marine Science and Technology, 4-5-7 Konan Minato-ku, Tokyo, 108-8477, Japan;2. Research and Development Department, Nichimo Co., Ltd, Shimonoseki, Yamaguchi, 750-1136, Japan |
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| Abstract: | A series of laboratory experiments were conducted to investigate the damping effect of net cages in waves. The wave transmission coefficient of the net cage was investigated with different wave periods, wave heights, numbers of net cages, net solidities, measurement positions, geometrical shapes of the net cage and Reynolds numbers. The experimental results show that the net cage has noticeable influence on wave propagation and the damping effect of net cages has a close relationship with many parameters. For multiple net cages, the transmission coefficient tends to increase as the wave period increases. The transmission coefficient of net cages decreases with increasing wave height. As the number of net cages increases, the wave transmission coefficient will decrease gradually. The damping effect of net cages on wave propagation tends to increase with increasing net solidity. The measurement position has an effect on the value of wave transmission coefficient. For net cages with different geometrical shapes, the circular net cage has more noticeable damping effect than the square net cage. A numerical model is introduced to simulate the interaction between waves and net cages with the fishing net treated as the porous media fluid model. The wave transmission coefficient downstream from net cages shows good agreement between experimental and numerical results. The study will contribute to understanding of the damping effect of a large fish farm on wave propagation. |
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| Keywords: | Net cage Damping effect Wave propagation Laboratory experiment |
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