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

POM 97, an oceanic model, has been used for the first time to the numerical study on the tidal waves of the sea reg ions around Taiwan.In this paper, we have got the result that the semidiurnal tidal waves of these area mainly are the co-operating tide which comes from the south of 23°N of the western Pacific.Those semidiurnal tidal waves which affect the Taiwan channel come respectively from the south and the north entrance of the channel, and the north one is stronger than the south's.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 current fields lie in Lake Penghu water course, where the maximum velocity of the M₂ partial tide can arrived at 196m/s.In the hor izontal structure of the tidal currents, 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 bias to right; and near the bottom layer, it bias to left.