Transition of Tidal Waves from the East to South China Seas over the Taiwan Strait: Influence of the Abrupt Step in the Topography |
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| Authors: | Sen Jan Ching-Sheng Chern Joe Wang |
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| Institution: | (1) Institute of Physical Oceanography, National Sun Yat-Sen University, 70 Lien-Hai Road, Kaohsiung, 80424, Taiwan, Republic of China;(2) National Taiwan University, P.O. Box 23-13, Taipei, 10617, Taiwan, Republic of China |
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| Abstract: | Observations of tidal waves between the East and South China Seas (ECS and SCS) over the Taiwan Strait (TS) suggest that the
diurnal tides simply appear as one southward-propagating wave from the ECS to the SCS through the TS. The semidiurnal tides,
however, behave differently in that they appear as a southward-propagating Kelvin wave in the western TS and a nearly standing
wave in the eastern TS, and then diminish rapidly over the shallow shoal in the southern TS. A smaller-domain model, with
sea-level boundary conditions derived from a larger-domain tidal model, was first used to simulate tides in the TS to an overall
percentage of accuracy of about 90%. Subsequent numerical experiments and theoretical analysis revealed that the southward-propagating
semidiurnal tides to be impeded and then reflected as they arrive at an abrupt, deepened step in the topography of the southern
TS. This reflection enhances the amplitudes of the incident semidiurnal tides and contributes to the formation of a nearly
standing wave in the eastern TS. The southward-propagating diurnal tides in the TS are connected by the diurnal tides in the
northern SCS when the amplitudes of the two tide systems are comparable and their phases nearly equal at the step.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | Tidal waves abrupt deepened topography Taiwan Strait South China Sea East China Sea |
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