Clockwise phase propagation of semi-diurnal tides in the Gulf of Thailand
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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.
KeywordsClockwise amphidrome natural oscillation tide Gulf of Thailand
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