Numerical Study on M2 Tidal System in the Taiwan Strait

摘要

This paper presented M2 tidal dynamic results of Taiwan Strait simulated by COHERENS model. The results showed that the M2 component's tidal system in the Taiwan Strait can be summarized as the coexistence of the Kelvin tidal wave system and the standing wave system. Zero ellipticity line of the tidal current at the middle layer could be close to that of the depth-averaged tidal current got by the traditional 2-dimensional works, further more, these lines may be not fixed, instead, half latitudinal distance could be found between that of the surface and the bottom layer, which could give reasonable explanation to the difference among studies. Tidal induced upwelling areas located at west coast of the Taiwan Strait, South to the Taiwan Bank, Penghu Channel and water area around Changyun Rise. Horizontally, the tide-induced upwelling tended to parallel with the coastline, and united with that of the East China Sea at the 30m isobath; vertically, the tide-induced upwelling had the tendency to decrease both in strength and domain.