Preprints
https://doi.org/10.5194/os-2020-86
https://doi.org/10.5194/os-2020-86

  28 Sep 2020

28 Sep 2020

Review status: a revised version of this preprint was accepted for the journal OS and is expected to appear here in due course.

Study on the Tidal Dynamics of the Korea Strait Using the Extended Taylor Method

Di Wu1, Guohong Fang1,2, Zexun Wei1,2, and Xinmei Cui1,2 Di Wu et al.
  • 1First Institute of Oceanography, Ministry of Natural Resources, Qingdao, 266061, China
  • 2Laboratory for Regional Oceanography and Numerical Modeling, Pilot National Laboratory for Marine Science and Technology, Qingdao, 266237, China

Abstract. The Korea Strait (KS) is a major navigation passage linking the Japan Sea (JS) to the East China Sea and Yellow Sea. Almost all existing studies on the tides in the KS employed either data analysis or numerical modelling methods; thus, theoretical research is lacking. In this paper, we idealize the KS-JS basin as three connected uniform-depth rectangular areas and establish a theoretical model for the tides in the KS and JS using the extended Taylor method. The model-produced K1 and M2 tides are consistent with the satellite altimeter and tidal gauge observations, especially for the locations of the amphidromic points in the KS. The model solution provides the following insights into the tidal dynamics. The tidal system in each area can be decomposed into two oppositely travelling Kelvin waves and two families of Poincaré modes, with Kelvin waves dominating the tidal system. The incident Kelvin wave can be reflected at the connecting cross-section, where abrupt increases in water depth and basin width occur from the KS to JS. At the connecting cross-section, the reflected wave has a phase-lag increase relative to the incident wave by less than 180°, causing the formation of amphidromic points in the KS. The above phase-lag increase depends on the angular frequency of the wave and becomes smaller as the angular frequency decreases. This dependence explains why the K1 amphidromic point is located farther away from the connecting cross-section in comparison to the M2 amphidromic point.

Di Wu et al.

 
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Status: closed
Status: closed
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Printer-friendly Version - Printer-friendly version Supplement - Supplement

Di Wu et al.

Di Wu et al.

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Short summary
The Korea Strait is a major navigation passage linking the Japan Sea to the East China Sea and Yellow Sea. This paper establishes a theoretical model for the tides in the Korea Strait and Japan Sea using the extended Taylor method. The model solution explains the formation mechanism of the tidal amphidromic systems in the Korea Strait, and why the K1 amphidromic point is located farther away from the shelf break separating the Korea Strait and Japan Sea in comparison to the M2 amphidromic point.