Numerical Simulation Of Three Dimensional Ocean Current In Taiwan Strait

Among the research of ocean current, tide is one of the most important factors. The variety of elevation and velocity distribution caused by tide determines the property of the ocean current. In regard to Taiwan Strait, the wind current is very significant force affecting coastal structures and sedimentation processes. Accordingly, the tide wave and the wind current are studied by numerical modeling elaborately in this paper.Based on the POM model, the tide movement is studied numerically. The results of numerical modeling are agreement with field measured data and other data provided by other experts. The distribution of co-amplitude and co-phase lag lines of semi-diurnal constituents of tidal current shows that the tidal current hi Taiwan Strait is influenced by both the north tide system and the south tide system. The tidal wave from the north determines the property of the whole tidal waves. The cotidal chart for Kl constituent shows that the Kl wave hi Taiwan Strait has the feature of Kelvin wave from northeast, and the energy is much less than the semi-diurnal constituents. This paper also discusses the vertical structure of velocity distribution.The numerical modeling of wind current is studied under winter and summer monsoon conditions. The elevation variety is analyzed. This part put an emphasis on the vertical structure of velocity field. Velocity field of sea surface and 20 meters deep is discussed elaborately. It is disclosed how the magnitude and direction of velocity varying with depth.