Numerical experiment on <Emphasis Type="Italic">Kyucho</Emphasis> around the Tango Peninsula induced by Typhoon 0406 |
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| Authors: | Yosuke Igeta Yujiro Kitade Masaji Matsuyama |
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| Institution: | (1) Department of Ocean Sciences, Faculty of Marine Science, Tokyo University of Marine Science and Technology, Konan, Minato-ku, Tokyo 108-8477, Japan;(2) Present address: Japan Sea National Fisheries Research Institute, Fisheries Research Agency, Suido-cho, Chuo-ku, Niigata-shi, Niigata 951-8121, Japan |
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| Abstract: | A numerical experiment using a three dimensional level model was performed to clarify the mechanism generating a strong coastal
current, Kyucho, induced by the passage of Typhoon 0406 around the tip of the Tango Peninsula, Japan in June 2004. Wind stress accompanied
by Typhoon 0406 was applied to the model ocean with realistic bottom topography and stratification condition. The model well
reproduced the characteristics of Kyucho observed by Kumaki et al. (2005), i.e., the strong alongshore current with maximum velocity of 53 cm s−1 and its propagation along the peninsula with propagation speed of about 0.6 m s−1 one half-day after the typhoon’s passage. Coastal-trapped waves (CTW) accompanied by downwelling were induced along the northwest
coast of the peninsula by the alongshore wind stress. The energy density flux due to the CTW flowed eastward along the coast,
and indicated scattering of the CTW around the eastern coast of the peninsula. In addition, significant near-inertial internal
gravity waves were also caused in the offshore region from the west of the Noto Peninsula to the north of the Tango Peninsula
by the typhoon’s passage. The energy flux density of the near-inertial fluctuations flowed southward off the Fukui coast,
and part of the energy flux was trapped on the tip of the Tango Peninsula, flowing with the coast on its right. It was found
that the strong current, Kyucho, at the northeastern tip of the Tango Peninsula was generated by superposition of the near-inertial internal gravity waves
and subinertial CTW. |
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| Keywords: | Kyucho typhoon coastal-trapped wave near-inertial internal gravity wave superposition Tango Peninsula numerical experiment |
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