Tidal Currents in the Tsushima Straits Estimated from ADCP Data by Ferryboat |
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| Authors: | Tetsutaro Takikawa Jono-Hwan Yoon Kyu-Dae Cho |
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| Institution: | (1) Department of Earth System Science and Technology, Interdisciplinary Graduate School of Engineering Science, Kyushu University, Kasuga, Fukuoka 816-8580, Japan;(2) Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan;(3) Department of Oceanography, Pukyong National University, 599-1 Dae-Yeondong, Nagu, Pusan, 608-737, Korea |
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| Abstract: | Tidal currents in the Tsushima Straits have been analyzed using measurements obtained since February 1997 by an acoustic Doppler
current profiler (ADCP) mounted on the ferryboat Camellia. Tidal current constituents (M
2, S
2, K
1, O
1) are dominant among the ten tidal current constituents (Q
1, O
1, P
1, K
1, N
2, M
2, S
2, K
2, MSf, Mf), and generally 1.4–2.1 times stronger at the western channel of the straits than those at the eastern channel. The ratio
between amplitude of M
2, S
2, K
1 and O
1 averaged along the ferryboat track is 1:0.45:0.59:0.51. The major axis directions of tidal current ellipses are generally
SW to NE, exceptionally in the vicinity of the Tsushima Islands. Approaching the Tsushima Islands from the Korean Peninsula
side, the major axis gradually rotates clockwise. At the western channel, the M
2 and K
1 constituents change the rotation direction of current vectors from clockwise to counterclockwise at about 90–130 m depth.
The contributions of the tidal currents to the mean kinetic energy and the mean eddy kinetic energy along the ferryboat track
are, on average, 0.56 and 0.71, respectively. This suggests that tidal current activities are generally more dominant than
the mean current activities and much more dominant than eddy activities. The only region where the eddy activities are comparable
to the tidal current activities is located on the east side of the Tsushima Islands.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | Tidal currents harmonic analysis the Tsushima Straits ADCP surveys using ferryboat |
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