Internal waves travelling behind a rapidly moving localized disturbance in a horizontally inhomogeneous fluid

A. G. Stetsenko

doi:10.1007/bf02525516

Internal waves travelling behind a rapidly moving localized disturbance in a horizontally inhomogeneous fluid

Physical Oceanography ◽

10.1007/bf02525516 ◽

1998 ◽

Vol 9 (2) ◽

pp. 103-111

Author(s):

A. G. Stetsenko

Keyword(s):

Internal Waves ◽

Inhomogeneous Fluid ◽

Horizontally Inhomogeneous

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Propagation of Internal Waves in Horizontally Inhomogeneous Ocean

Atmospheric and Oceanographic Sciences Library - Dynamics of Internal Gravity Waves in the Ocean ◽

10.1007/978-94-017-1325-2_6 ◽

2001 ◽

pp. 119-152

Author(s):

Yu. Z. Miropol’sky ◽

O. D. Shishkina

Keyword(s):

Internal Waves ◽

Horizontally Inhomogeneous

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Internal waves in a horizontally inhomogeneous flow

Journal of Fluid Mechanics ◽

10.1017/s0022112084001087 ◽

1984 ◽

Vol 142 ◽

pp. 233-249 ◽

Cited By ~ 18

Author(s):

A. Ya. Basovich ◽

L. Sh. Tsimring

Keyword(s):

Wave Propagation ◽

Internal Wave ◽

Internal Waves ◽

Short Wave ◽

Wave Transformation ◽

Wave Trapping ◽

Wave Amplification ◽

Normal Surfaces ◽

Inhomogeneous Flow ◽

Horizontally Inhomogeneous

The effect of horizontally inhomogeneous flows on internal wave propagation in a stratified ocean with a constant Brunt-Väisälä frequency is analysed. Dispersion characteristics of internal waves in a moving fluid and kinematics of wave packets in smoothly inhomogeneous flows are considered using wave-normal surfaces. It is shown that internal-wave blocking and short-wave transformation may occur in longitudinally inhomogeneous flows. For parallel flows internal-wave trapping is possible in the vicinity of the limiting layer where the wave frequency in the locally comoving frame of reference coincides with the Brunt-Väisälä frequency. Internal-wave trapping also takes place in jet-type flows in the vicinity of the flow-velocity maximum. WKB solutions of the equation describing internal-wave propagation in a parallel horizontally inhomogeneous flow in the linear approximation are obtained. Singular points of this equation and the related effect of internal-wave amplification (overreflection) under the action of the flow are investigated. The spectrum and the growth rate of internal-wave localized modes in a jet-type flow are obtained.

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