Numerical Simulation of Waves Generated by Seafloor Movements |
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| Authors: | HE Hai-lun SONG Jin-bao LI Shuang YANG Jian-ping |
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| Institution: | HE Hai-lun,SONG Jin-bao,LI Shuang and YANG Jian-ping(1.Instituse of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China,2.College of Traffic and Ocean Engineering, Hohai University, Nanjing 210098, China;3.Key Laboratory of Ocean Circulation and Waves ( KLOCA W), Chinese Academy of Sciences, Qingdao 266071, China,4Graduate School, Chinese Academy of Sciences, Beijing 100039, China,5.Inner Mongolia Machine Electricity Occupation Technical College, Hohhot 010051, China) |
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| Abstract: | Waves generated by vertical seafloor movements are simulated by use of a fully nonlinear two-dimensional numerical wave tank. In the source region, the seafloor lifts to a designated height by a generation function. The numerical tests show that the linear theory is only valid for estimating the wave behaviors induced by the seafloor movements with a small amplitude, and the fully nonlinear numerical model should be adopted in the simulation of the wave generation by the large amplitude seafloor movements. Without the background surface waves, many numerical tests on the stable maximum elevations ηmax0 are carried out by both the linear theory and the fully nonlinear model. The results of two models are compared and analyzed. For the fully nonlinear model, the influences of the amplitudes and the horizontal lengths on ηmax0 are stronger than that of the characteristic duration times. Furthermore, results reveal that there are significant differences between the linear theory and the fully nonlinear model. When the influences of the background surface waves are considered, the corresponding numerical analyses reveal that with the fully nonlinear model the ηmax0 near-linearly varies with the wave amplitudes of the surface waves, and the ηmax0 has significant depndences on the wave lengths and the wave phases of the surface waves. In addition, the differences between the linear theory and the fully nonlinear model are still obvious, and these differences are significantly affected by the wave parameters of the background surface waves, such as the wave amplitude, the wave length and the wave phase. |
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| Keywords: | boundary element method numerical wave tank seafloor movement surface waves |
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