TERRAPUB Journal of Oceanography

Journal of Oceanography, Vol. 56 (No. 6), pp. 625-642, 2000

Applications of the Mild-Slope Equation to Tidal Computations in the Taiwan Strait

Ming-Chung Lin1, Wen-Jye Juang2* and Ting-Kuei Tsay3

1Department of Naval Architecture and Ocean Engineering, National Taiwan University, Taipei 106, Taiwan
2Institute of Harbor and Marine Technology, Ministry of Transportation and Communications, Wu-chi 435, Taiwan
3Department of Civil Engineering, National Taiwan University, Taipei 106, Taiwan

(Received 14 December 1999; in revised form 26 April 2000; accepted 7 June 2000)

Abstract: Employing harmonic analysis of tidal data in the Taiwan Strait, the cross-strait tidal characteristics are completely illustrated. Based on the two dimensional mild-slope equation which can be reduced to the shallow-water wave equation, a finite element model (Tsay et al., 1989) is applied to investigate the characteristics of tides in the Taiwan Strait. The co-range and equi-phase charts of major tidal constituents, such as M2, S2, N2, and K1, are reproduced. Anomalous amplification of semidiurnal tides in the Taiwan Strait is verified. With rotation effects neglected and by applying a non-reflective condition on the open boundaries, the numerical results of phase-lag and co-range distributions show very good agreement with observed data for semidiurnal tides in the Taiwan Strait. Due to crude representation of the topography at two ends along the China coast, computed tidal distributions deviate from the observations. However, both computed amplitudes and phase-lags compare very well with observed data along the central half of the China coast.

*Corresponding author E-mail: wjjuang@ms1.hinet.net

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