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A NONHYDROSTATIC NUMERICAL MODEL FOR DENSITY STRATIFIED FLOW AND ITS APPLICATIONS

Journal of Hydrodynamics 2008年第6期20卷 706-712页

作者： LI Qun XU Zhao-ting Polar Research Institute of China （PRIC） Shanghai 200136 China Physical oceanography Institute Ocean University of China Qingdao 266100 China

A modular numerical model was developed for simulating density-stratified flow in domains with irregular bottom topography. The model was designed for examining interactions between stratified flow and topography, e.g,, tidally driven flow over two-dimensional sills or internal solitary waves propagating over a shoaling bed. The model was based on the non-hydrostatic vorticity-stream function equations for a continuously stratified fluid in a rotating frame. A self-adaptive grid was adopted in the vertical coordinate, the Alternative Direction Implicit （ADI） scheme was used for the time marching equations while the Poisson equation for stream-function was solved based on the Successive Over Relaxation （SOR） iteration with the Chebyshev acceleration. The numerical techniques were described and three applications of the model were presented.

关键词： nonhydrostatic assumption stratified flow self-adaptive grid nonlinear internal wave

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Shoaling of the internal solitary waves over the continental shelf of the northern South China Sea

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Acta Oceanologica Sinica 2015年第9期34卷 35-42页

作者： QIAN Hongbao HUANG Xiaodong TIAN Jiwei ZHAO Wei Physical Oceanography Laboratory Ocean University of China The Administrative Centre for China's Agenda 21

The activities of internal solitary waves （ISWs） over the continental shelf of the northern South China Sea （SCS） are of high complexity. In this study, we investigated the spatial-temporal characteristics of the shoaling ISWs over the northern SCS continental shelf using the satellite images and the results of numerical simulation. The examination of the ISW signals in the satellite optical images revealed the existence of three types of iSWs in the region north to the Dongsha Island, namely, mode-1 depression ISW, mode-1 elevation ISW, and mode-2 convex ISW. The geographical distributions of these ISWs were derived from the satellite images. Numerical results exhibited the process of polarity conversion of ISWs, by which mode-1 elevation waves were transformed from the shoaling mode-1 depression waves. The mode-2 convex ISWs generally followed the mode-1 depression ISWs. The numerical results suggested that the interaction of the mode-1 depression ISWs with the up-slope topography locally generated mode-2 ISWs, and such waves of high vertical mode dissipated rapidly during the inshore propagation.

关键词： internal solitary wave nonlinear internal wave South China Sea vertical mode

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Mooring observations of internal solitary waves in the deep basin west of Luzon Strait

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Acta Oceanologica Sinica 2014年第3期33卷 82-89页

作者： HUANG Xiaodong ZHAO Wei TIAN Jiwei YANG Qingxuan Physical Oceanography Laboratory Ocean University of China

A total of 137 internal solitary waves （ISWs） are captured during a field experiment conducted in the deep basin west of the Luzon Strait （LS） from March to August, 2010. Mooring observations reveal that a fully developed ISW owns a maximum westward velocity of more than 1.8 m/s and an amplitude of about 200 m. The ISWs in the South China Sea （SCS） are most active in July, which may be due to the strong stratification in summer. Most of the ISW episodes are detected around and after the 1st or 15th lunar day, indicating that the ISW in the SCS is triggered by astronomic tides. Half part of the observed ISWs were detected around 19：00 local time, which can be explained by the fact that type-a ISWs emerged in the evening at roughly the same time each day. The propagation direction of the ISWs and the astronomic tides in the LS show that the area south of the Batan Island is probably the main source region of the type-a ISWs, while the area south of Itbayat Island and south of the Batan Island is likely the main source region of the type-b ISWs observed at the mooring. Moreover, for the resonance of semidiurnal internal tides emitting from the double ridges in the LS, the underwater ridge south of the Itbayat Island and south of the Batan Island is believed to favor the generation of the energetic ISWs.

关键词： internal solitary wave South China Sea observation nonlinear internal wave

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