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An estimation of internal soliton forces on a pile in the ocean
Authors:Du Tao  Sun Li  Zhang Yijun  Bao Xianwen  Fang Xinhua
Affiliation:1. Physical Oceanography Laboratory, Ocean University of China, Qingdao 266003, P. R. China
2. Physical Oceanography Laboratory, Ocean University of China, Qingdao 266003, P. R. China;Shanghai Flood Risk Information Center, Shanghai 200050, P. R. China
3. National Marine Data and Information Service, Tianjin 300171, P. R. China
Abstract:Internal soliton forces on oil-platform piles in the ocean are estimated with the Morison Formula. Different from sur face wave forces, which change only in magnitude along a pile, internal soliton forces can be distributed over the entire pile in the water and they change not only in magnitude but also in direction with depth. Our calculations show that the maximum total force caused by a soliton with its associated current of 2.1 ms-1 is nearly equal to the maximum total force exerted by a surface wave with a wavelength of 300 m and a wave-height of 18 m. The total internal soliton force is large enough to affect the operations of marine oil platforms and other facilities. Therefore, the influence of internal solitons should not be neglected in the design of oil platforms.
Keywords:oceanic internal wave  internal soliton  internal soliton force  ocean oil platform
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