Discontinuity formation due to gravity wave propagation in a shear layer

Details Discontinuity formation due to gravity wave propagation in a shear layer Discontinuity formation due to gravity wave propagation in a shear layer

Feb 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979phfl...22..209t&link_type=abstract

Physics of Fluids, vol. 22, Feb. 1979, p. 209-213.

Physics

1

Flow Distribution, Gravity Waves, Shear Layers, Thermosphere, Wave Propagation, Density Distribution, Discontinuity, Linearization, Nonlinear Equations, Richardson Number, S Waves, Shear Flow, Velocity Distribution

Scientific paper

The propagation of an internal gravity wave in shear flow is analyzed. The use of characteristic surfaces as a new coordinate enables a first order solution to be corrected. It is shown that a contact discontinuity always appears at a level lower than the critical level, that is, before the horizontal velocity and vertical wavenumber become unbounded. The results are in accord with the observed existence of very high vertical gradients of horizontal velocity in the lower thermosphere.

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