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《Periodical of Ocean University of China》 2015-01
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2-D Numerical Simulation of Internal Solitary Waves in the Sea Waters to the Northeast of Taiwan Island

FAN Chao;CHEN Xue-En;CHI Le-Quan;College of Physical and Environmental Oceanography,Ocean University of China;  
Rank-ordered packets of nonlinear internal solitary waves(ISWs)in the northeast of Taiwan are often observed in the SAR images and they are quite complicated.A 2-D fully nonlinear non-hydrostatic model,MITgcm,with M2 tidal forcing and a simplified topography is applied to investigate the generation process and mechanism of the ISWs there.Tidal-topography interaction plays an important role in the generation and the propagate process of the ISWs in this region.Modeling results show that the internal waves are generated when the barotropic current flows over two sills.Analysis of tidal excursion and the topographic Froude number,which govern the generation process indicates that the generation of internal waves in this area is subject to mixed lee wave mechanism.On the left side that close to the continental,ISWs are generated when the tidal flow on the sill-top changes from ebb to flood tides,which move westward in the ebb tides while they are trapped in the flood tides.On the right side that away from the continental,second mode ISWs are generated and develop into a series of ISWs with the amplitude declining during its propagating to the deep ocean.Sensitive numerical experiments with different influencing factors are taken to investigate the generation and propagation mechanisms of the ISWs.It is revealed that the internal solitary waves in this area are excited by semi-diurnal M2 tide,while the K1 tidal alone can not generate ISWs with large amplitude as the study region is close to its critical latitude.The results also show that the stratification and Coriolis force have influences on the generation and propagation of ISWs while the effect of horizontal model resolution are negligible to low mode ISWs.
【Fund】: 山东省超级计算科技专项项目“全球大洋中尺度涡旋预报和南中国海内孤立波预报系统研发”;; 国家自然科学基金项目“南海内波的生成、传播及其三维性项目(41276008)资助
【CateGory Index】: P731.24
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