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Clockwise phase propagation of semi-diurnal tides in the Gulf of Thailand

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Abstract

The phase of semi-diurnal tides (M2 and S2) propagates clockwise in the central part of the Gulf of Thailand, although that of the diurnal tides (K1, O1 and P1) is counterclock-wise. The mechanism of clockwise phase propagation of semi-diurnal tides at the Gulf of Thailand in the northern hemisphere is examined using a simple numerical model. The natural oscillation period of the whole Gulf of Thailand is near the semi-diurnal period and the direction of its phase propagation is clockwise, mainly due to the propagation direction of the large amplitude part of the incoming semi-diurnal tidal wave from the South China Sea. A simplified basin model with bottom slope and Coriolis force well reproduces the co-tidal and co-range charts of M2 tide in the Gulf of Thailand.

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Authors and Affiliations

  1. Research Institute for Applied Mechanics, Kyushu University, 816, Kasuga, Japan

    Tetsuo Yanagi

  2. Department of Civil and Environmental Engineering, Ehime University, 790, Matsuyama, Japan

    Toshiyuki Takao

Authors
  1. Tetsuo Yanagi
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  2. Toshiyuki Takao
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Yanagi, T., Takao, T. Clockwise phase propagation of semi-diurnal tides in the Gulf of Thailand. J Oceanogr 54, 143–150 (1998). https://doi.org/10.1007/BF02751690

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  • DOI: https://doi.org/10.1007/BF02751690

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