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. The Korea Strait (KS) is a major navigation passagelinking the Japan Sea (JS) to the East China Sea and Yellow Sea. Almost allexisting studies of the tides in the KS employed either data analysis ornumerical modelling methods; thus, theoretical research is lacking. In thispaper, we idealize the KS–JS basin as four connected uniform-depthrectangular areas and establish a theoretical model for the tides in the KSand JS using the extended Taylor method. The model-produced K1 andM2 tides are consistent with the satellite altimeter and tidal gaugeobservations, especially for the locations of the amphidromic points in theKS. The model solution provides the following insights into the tidaldynamics. The tidal system in each area can be decomposed into twooppositely travelling Kelvin waves and two families of Poincaré modes,with Kelvin waves dominating the tidal system. The incident Kelvin wave canbe reflected at the connecting cross section, where abrupt increases inwater depth and basin width occur from the KS to JS. At the connectingcross section, the reflected wave has a phase-lag increase relative to theincident wave of less than 180∘, causing the formation ofamphidromic points in the KS. The above phase-lag increase depends on theangular velocity of the wave and becomes smaller as the angular velocitydecreases. This dependence explains why the K1 amphidromic point islocated farther away from the connecting cross section in comparison to theM2 amphidromic point.

Study of the tidal dynamics of the Korea Strait using the extended Taylor method