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.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Asa, Y., N. Hirose and T. Senjyu (2007): Numerical simulation of Kyucho along the eastern coast of the Noto Peninsula in 2004. Umi no Kenkyu, 12, 603–617 (in Japanese with English abstract).
Brink, K. H. and D. C. Chapman (1987): Programs for computing properties of coastal-trapped waves and wind-driven motions over the continental shelf and slope. WHOI Tech. Rep. 87–24, 2nd ed., Woodshole Oceanographic Institution, Woods Hole, MA, 119 pp.
Chapman, D. C. (1985): Numerical treatment of cross-shelf open boundaries in a barotropic coastal ocean model. J. Phys. Oceanogr., 15, 1060–1075.
Garrett, C. (2000): What is the “near-inertial” band and why is it different from the rest of the internal wave spectrum? J. Phys. Oceanogr., 31, 962–971.
Gill, A. E. (1982): Atmosphere-Ocean Dynamics. Academic Press, Inc., Orlando, 662 pp.
Igeta, Y., Y. Kitade and M. Matsuyama (2003): Numerical experiments on the Kyucho current in Sagami Bay associated with the coastal-trapped waves caused by typhoon 8818. Oceanography in Japan, 12, 603–617 (in Japanese with English abstract).
Igeta, Y., Y. Kitade and M. Matsuyama (2005): Numerical experiments on scattering of coastal-trapped waves by topography and bays. Oceanography in Japan, 14, 441–458 (in Japanese with English abstract).
Igeta, Y., Y. Kitade and M. Matsuyama (2007): Characteristics of coastal-trapped waves induced by typhoon along the southeast coast of Honshu, Japan. J. Oceanogr., 63, this issue, 745–760.
Isoda, Y., T. Yanagi and L. Heung-Jae (1991): Sea level response to atmospheric pressure forcing at the Japanese coastal region. Cont. Shelf Res., 11, 167–182.
Katoh, O. (1994): Structure of the Tsushima current in the southwestern Japan Sea. J. Oceanogr., 50, 317–338.
Kawabe, M. (1982): Branching of the Tsushima Current in the Japan Sea, Part I. Data analysis. J. Oceanogr. Soc. Japan, 38, 95–107.
Kitade, Y. and M. Matsuyama (2000): Coastal-trapped waves with several-day period caused by wind along the southeast coast of Honsyu, Japan. J. Oceanogr., 56, 727–744.
Kumaki, Y., Y. Ueno, N. Sobajima and M. Matsuyama (2005): The Kyucho current along the Kyoto coast induced by typhoon 0406. Umi no Kenkyu, 14(6), 653–664 (in Japanese with English abstract).
Matsuyama, M. (1990): The structure of the nearshore branch of the Tsushima current on the shelf off the San’in coast in summer. J. Oceanogr. Soc. Japan, 46, 156–166.
Matsuyama, M., T. Nazumi and T. Takahata (1986): Characteristics of the current field off the Tajima Coast. Bull. Coast. Oceanogr., 23, 129–138 (in Japanese).
Matsuyama, M., S. Iwata and H. Nagamatsu (1997): Kyucho in Sagami Bay induced by Typhoon 8818. J. Oceanogr., 53, 199–205.
Suginohara, N. (1982): Coastal upwelling: Onshore-offshore circulation, equatorward coastal jet and poleward undercurrent over a continental shelf-slope. J. Phys. Oceanogr., 12, 272–284.
Takeoka, H. (1992): A summary of “Symposium on Kyucho—Interactions between coastal and open seas—”. Bull. Coast. Oceanogr., 30, 1–3 (in Japanese with English abstract).
Yamada, H., O. Katoh and T. Watanabe (2006): Influence of a warm eddy upon current structures in the coastal waters off regions between Oki and Noto. Umi no Kenkyu, 15, 249–265 (in Japanese with English abstract).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Igeta, Y., Kitade, Y. & Matsuyama, M. Numerical experiment on Kyucho around the Tango Peninsula induced by Typhoon 0406. J Oceanogr 63, 835–847 (2007). https://doi.org/10.1007/s10872-007-0071-0
Received:
Revised:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/s10872-007-0071-0