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Journal of Oceanography

, Volume 54, Issue 2, pp 143–150 | Cite as

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

  • Tetsuo Yanagi
  • Toshiyuki Takao
Article

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.

Keywords

Clockwise amphidrome natural oscillation tide Gulf of Thailand 

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Copyright information

© The Oceanographic Society of Japan 1998

Authors and Affiliations

  • Tetsuo Yanagi
    • 1
  • Toshiyuki Takao
    • 2
  1. 1.Research Institute for Applied MechanicsKyushu UniversityKasugaJapan
  2. 2.Department of Civil and Environmental EngineeringEhime UniversityMatsuyamaJapan

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