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A numerical study on the tidal residual flow

  • Yukio Oonishi
Article

Abstract

A fundamental mechanism of generation of the tidal residual flow, the steady or quasi-steady flow induced in the tidal current system, is studied by numerical methods. The model basin is a very simple one, a rectangular basin of 5m×10m of constant depth and with a cape of 4 m length jutting out at a right angle from the center of the longer side wall. This basin has the same topography as that studied byYanagi (1976) by means of the hydraulic model experiments.

The steady, circular, horizontal current is found to be induced through the following processes. Horizontal friction at the coast makes the vorticity of vertical component in the oscillating flow. Self-interaction of this flow causes the vorticity transfer to the steady flow in frequency domain. This vorticity transfer is confined in the narrow coastal boundary layer. The steady flow advects the transferred vorticity and makes itself develop fully wide over the bay. In other words, there are two kinds of ‘cascade-up’, one with regard to time scale and the other with regard to horizontal space scale.

When the tidal range, the tidal period and the horizontal eddy viscosity change under the condition that the model geometry is fixed, the nondimensional parameter which controlls the steady flow is found to be the Reynolds number of the oscillating flow.

Keywords

Reynolds Number Vorticity Steady Flow Eddy Viscosity Tidal Period 
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. Higuchi, H. andT. Yanagi (1974): On the hydraulic model experiment on the diffusion due to the tidal current (IV). Disaster Prev. Res. Inst. Annuals of Kyoto Univ.,17B, 647–655 (in Japanese).Google Scholar
  2. Hunt, J. N. andB. Johns (1963): Current induced by tides and gravity waves. Tellus,15, 343–351.Google Scholar
  3. Sugimoto, T. (1975): Effect of boundary geometries on tidal currents and tidal mixing. J. Oceanogr. Soc. Japan,31, 1–31.Google Scholar
  4. Yanagi, T. (1976): The fundamental study of the tidal residual circulation. J. Oceanogr. Soc. Japan,32, 199–208.Google Scholar
  5. Yamada, T. andY. Yano (1971): On occurrence of constant and quater-diurnal currents by the topographical effect. Report of Hydrographic Researches, b, pp. 63–77 (in Japanese).Google Scholar

Copyright information

© Oceanographical Society of Japan 1977

Authors and Affiliations

  • Yukio Oonishi
    • 1
  1. 1.Geophysical InstituteKyoto UniversityKyotoJapan

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