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Continental shelf waves off the Fukushima coast

Part 3. Numerical experiments
  • Masahisa Kubota
Article

Abstract

Numerical experiments are performed on shelf waves forced by wind stress with a spectral peak around a period of 100 hr. Water depth in the numerical model is a function of offshore distance only and resembles a bathymetric profile off the Fukushima coast. A pair of vortices alined in the offshore direction and a large vortex are reproduced and they propagate southward outside the forced region. Judging from the propagation speed, the former corresponds to the second-mode and the latter to the first-mode shelf waves. In the forced region, the propagation speed of a trough and a ridge is slow, 3–5km hr−1. These propagation characteristics reproduce those observed along the Fukushima coast and this propagation speed corresponds to that of second-and third-mode shelf waves. Thus, it is concluded that the periodical current fluctuations observed in the inshore region along the Fukushima coast are due to motions associated with the second-and third-mode shelf waves.

Keywords

Vortex Numerical Model Water Depth Numerical Experiment Propagation Characteristic 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Gill, A.E. and E. H. Schumann (1974): The generation of long shelf waves by the wind. J. Phys. Oceanogr.,4, 83–90.Google Scholar
  2. Kubota, M., K. Nakata and Y. Nakamura (1978): Characteristics of low-frequency current fluctuations off Fukushima. Kaiyo Kagaku (marine Science),10, 499–508. (in Japanese)Google Scholar
  3. Kubota, M., K. Nakata and Y. Nakamura (1981): Continental shelf waves off the Fukushima coast. Part 1. Observations. J. Oceanogr. Soc. Japan,37, 267–278.Google Scholar
  4. Kubota, M. (1982): Continental shelf waves off the Fukushima coast. Part 2. Theory of their generation. J. Oceanogr. Soc. Japan,38, 323–330.Google Scholar

Copyright information

© Oceanographical Society of Japan 1985

Authors and Affiliations

  • Masahisa Kubota
    • 1
  1. 1.Geophysical InstituteUniversity of TokyoTokyoJapan

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