Journal of Oceanography

, Volume 62, Issue 5, pp 731–744 | Cite as

Coastal current on the eastern shelf of Hidaka Bay

  • Hiroshi Kuroda
  • Yutaka Isoda
  • Hidetaka Takeoka
  • Satoshi Honda
Original Articles


In order to examine seasonal variation in a coastal current and the dynamics of the current, we carried out a mooring current measurement near the coast on the eastern shelf of Hidaka Bay from December 2002 to July 2003. There seemed to be two current regimes during the observed period; one a southeastward current from December to March, and the other a northwestward current after April. Arrested topographic wave dynamics was used to understand along-shore steady momentum balance at the mooring site. It was found that the friction term was negligible during the former regime, that is, the wind stress term roughly counterbalanced the pressure gradient term. On the other hand, the contribution of each term to the momentum balance was sensitive to the resistance coefficient value during the latter regime. A numerical study showed that wind forcing alone could not reproduce the observed current velocity and momentum balance during the former regime. One possible interpretation of the observed results is superposition of the arrested topographic waves forced by the along-shore wind stress and downstream extension of the Coastal Oyashio. Numerical experiments using combined forcing of the wind stress and an inflow associated with the Coastal Oyashio supported the expected dynamics.


Hidaka Bay coastal current arrested topographic wave Coastal Oyashio 


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Copyright information

© The Oceanographic Society of Japan/TERRAPUB/Springer 2006

Authors and Affiliations

  • Hiroshi Kuroda
    • 1
  • Yutaka Isoda
    • 2
  • Hidetaka Takeoka
    • 3
  • Satoshi Honda
    • 4
  1. 1.National Research Institute of Fisheries Science, Sanbashi-doriKochiJapan
  2. 2.Graduate School of Fisheries ScienceHokkaido University, Minato-choHakodate, HokkaidoJapan
  3. 3.Center for Marine Environmental StudiesEhime University, Bunkyo-choMatsuyama, EhimeJapan
  4. 4.Hokkaido National Fisheries Research Institute, KatsurakoiKushiro, HokkaidoJapan

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