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


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.


Clockwise amphidrome natural oscillation tide Gulf of Thailand 


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  1. Kajiura, K. (1958): Effect of Coriolis force on edge waves (II) Specific examples of free and forced waves.J. Mar. Res.,16, 145–157.Google Scholar
  2. Momoi, T. (1974): A long wave in an L-shaped channel.J. Phys. Earth,22, 395–414.Google Scholar
  3. Reid, R. O. (1958): Effect of Coriolis force on edge waves (I) Investigation of the normal modes.J. Mar. Res.,16, 109–144.Google Scholar
  4. Sterneck, R. V. (1922): Schematische Theorie der Gezeiten des Schwarzen Meeres.S.B. Akad. Wiss. Wien. (Math.-Naturwiss, Kl.),131, 81.Google Scholar
  5. Taylor, G. I. (1920): tidal oscillations in gulfs and rectangular basins.Proc. Lond. Math. Soc.,20, 148–181.CrossRefGoogle Scholar
  6. Ursell, F. (1952): Edge waves on a sloping beach.Proc. Roy. Soc.,A214, 79–97.Google Scholar
  7. Yanagi, T. and T. Takao (1997): A numerical experiment on the tide and tidal current in the South China Sea.9th JECSS-PAMS Proceedings.Google Scholar
  8. Yanagi, T., T. Takao and A. Morimoto (1997): Co-tidal and corange charts in the South China Sea derived from satellite altimetry data.La mer,35, 85–94.Google Scholar

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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