Laboratory model of the Obukhov geostrophic vortex |
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| Authors: | V O Kakhiani K I Patarashvili S D Tsakadze M V Kalashnik L Kh Ingel |
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| Institution: | 1.Abastuman Astrophysical Observatory,Tbilisi,Georgia;2.Andronikashvili Institute of Physics,Academy of Sciences of Georgia,Tbilisi,Georgia;3.Obninsk State Technical University of Atomic Energy,Obninsk, Kaluga oblast,Russia;4.NPO Taifun,Obninsk, Kaluga oblast,Russia |
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| Abstract: | The results of laboratory modeling of geostrophic adjustment in a shallow-water layer in rotating paraboloid are presented.
According to the Rossby-Obukhov theory, this process excites nonstationary wave and stationary vortex (geostrophic) components
of motion in a rotating fluid. In our experiments, the wave and vortex components were excited by extracting a preliminarily
imbedded hemisphere (which made the initial distribution of the depth of the fluid inhomogeneous) from the central area of
a rotating vessel with a parabolic base. Under this excitation technique, a prominent cyclonic eddy is formed in the central
portion; the structure of this eddy is satisfactorily described within the linear theory of adjustment. Along with the shallow-water
experiments, the published experimental data on modeling geostrophic adjustment in a two-layer medium are analyzed. A simple
analytic solution to the corresponding problem of the adjustment theory is obtained, and this solution agrees with the experiment. |
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