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Journal of the Oceanographical Society of Japan

, Volume 34, Issue 6, pp 250–260 | Cite as

Diagnostic analysis of water circulations in Lake Biwa

  • Shuichi Endoh
Article

Abstract

A diagnostic model is developed for the study of steady water-circulations during summer in Lake Biwa. The most characteristic feature of the present model is to include the vertical friction terms in the basic equations, so that it is not necessary to assume a level of no-motion. Under no-wind condition, the velocity field is calculated from the density field obtained by successive observations of water temperature using a bathythermograph.

The comparisons of the present calculation with a dynamical calculation and direct current measurements indicate that the present model surpasses a dynamical calculation in the respects that 1) vertical circulations can be estimated and 2) the flow pattern in the deep layers can be obtained more reliably. One of important results of the present calculation is that a large vertical circulation has been found accompanied by the large counterclockwise gyre in the north basin. Preliminary results of direct current measurements by cross-boad drogues also seem to suggest the existence of the circulation.

Keywords

Water Temperature Velocity Field Flow Pattern Present Model Deep Layer 
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. Holland, W. R. andA. D. Hirschman (1972): A numerical calculation of the circulation in the North Atlantic Ocean. J. Phys. Oceanogr.,2, 336–354.Google Scholar
  2. Imasato, N. (1972): Study of seiche in Lake Biwako (III)—Some results of a numerical experiment by nonlinear two dimentional model. Cont., Geophys. Inst., Kyoto Univ.,12, 63–75.Google Scholar
  3. Kanari, S. (1973): Internal waves in Lake Biwa (II)—Numerical experiments with a two layer model. Bull. Disast. Prev. Res., Kyoto Univ.,22, 69–96.Google Scholar
  4. Kunishi, H., I. Okamoto andH. Sato (1967): Observations of water circulation in Lake Biwako (I). Annuals, Disast. Prev. Res., Kyoto Univ.,10B, 321–329.Google Scholar
  5. Kunishi, H. and H.Sato (1970): Observations of water circulation in Lake Biwa-ko (II). Annuals, Disast. Prev. Res., Kyoto Univ.,13B, 489–492.Google Scholar
  6. Okamoto, I. andM. Morikawa (1961a): Water circulation in Lake Biwa-ko as deduced from the distribution of water density. Jap. J. Limnol.,22, 193–200.Google Scholar
  7. Okamoto, I. (1964): Current observation of the southern Lake Biwa-ko with a drogue series. Memoirs, Fac. Education, Shiga Univ., Natural Sci.,14, 27–34.Google Scholar
  8. Okamoto, I. (1968): Time variation of water temperature in Lake Biwa-ko (II)—Variation of the temperature distribution accompanied with the fluctuation of water current. Memoirs, Fac. Education, Shiga Univ., Natural Sci.,18, 53–64.Google Scholar
  9. Oonishi, Y. (1975): Development of the current induced by the topographic heat accumulation (I)—The case of the axisymetric basin. J. Oceanogr. Soc. Japan,31, 243–254.Google Scholar
  10. Sarkisyan, A. S. andA. F. Pastukhov (1970): The density field as the main indicator of steady sea currents. Bull. (Izv.) Acad. Sci. USSR, Atmospheric and Oceanic Phys.,6, No. 1, 64–75.Google Scholar
  11. Takahashi, T. (1957): A physical treatment on the accumulated materials of the annual temperature variation in lakes and ocean. Mem. Fac. Fish. Kagoshima Univ.,6, 47–76.Google Scholar

Copyright information

© Oceanographical Society of Japan 1978

Authors and Affiliations

  • Shuichi Endoh
    • 1
  1. 1.Institute of Earth Science and Astrophysics, Faculty of EducationShiga UniversityOhtsuJapan

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