Clockwise phase propagation of semi-diurnal tides in the Gulf of Thailand |
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| Authors: | Tetsuo Yanagi Toshiyuki Takao |
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| Institution: | (1) Research Institute for Applied Mechanics, Kyushu University, 816 Kasuga, Japan;(2) Department of Civil and Environmental Engineering, Ehime University, 790 Matsuyama, Japan |
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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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| Keywords: | Clockwise amphidrome natural oscillation tide Gulf of Thailand |
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