Numerical simulation of characteristics of semidiurnal tidal waves in sea region around Taiwan

INTRODUCTIONNumerica comutation and simu1ation of tidal waves in the closed ocean of China havebo greatly imProved in recent years. As far as the method Of numerica comPU8tion are con-cemed, we can divide them into two classes: beundary va1ue methed and initial value methed.The fOrmer needs the tidal level value of coast beund8ry and the side beundary of water shOuldbe given, and its calculative result dePends on the reliability of boundary value. The rnan-madeermr, caed by getting the…

Numerical simulation of characteristics of semidiurnal tidal waves in sea region around Taiwan

POM97, an oceanic model, has been used for the first time to the numerical study on the tidal waves of the as Regions around Taiwan. In this paper, we have got the result that the semidiurnal tidal waves of these area mainly are the co-operating tides which come from the south of 23'N of the western Pacific. Those semidiurnal tidal waves affecting the Taiwan Straits come respectively from the south and the north entrance of the channel, and the north tidal wave is stronger than the south one. The strongest tidal field is the area from the Meizhou Bay to the Xinhua Bay along the coast of Fujian Province, where the biggest amplitude of the M2 partial tide can reach 240 cm. The strongest tidal cur- rent fields lie in the Penghu watercourse, where the maximum velocity of the M2 partial tide can arrive at 196 m/s. In the horizontal structure of the tidal currets, we have found that there is a stream dot in the north of the channel, besides, there still exist four new ones. As for the vertical structure, it mainly is biassed to the right at the surface, and to the left near the bottom layer.