Shear Flow Influence on Internal Waves Propagation

2001 ◽  
pp. 97-117
Author(s):  
Yu. Z. Miropol’sky ◽  
O. D. Shishkina
Keyword(s):  
Shear Flow ◽  
Internal Waves ◽  
Waves Propagation

Convection and Internal Waves in a Stably Stratified Shear Flow,

1994 ◽  
Author(s):  
Patrick C. Gallacher ◽  
Hemantha W. Wijesekera
Keyword(s):  
Shear Flow ◽  
Internal Waves ◽  
Stratified Shear Flow ◽  
Stably Stratified Shear Flow

A laboratory study of stratified accelerating shear flow over a rough boundary

1984 ◽  
Vol 138 ◽  
pp. 185-196 ◽  
Author(s):  
S. A. Thorpe
Keyword(s):  
Shear Flow ◽  
Internal Waves ◽  
Mixing Layer ◽  
Internal Gravity Waves ◽  
Rough Boundary ◽  
Turbulent Layer ◽  
Near Surface ◽  
Rate Of Spread ◽  
Vertical Scale ◽  
The Waves

Experiments are made in which a stratified shear flow, accelerating from rest and containing a level where the direction of flow reverses, is generated over a rough floor. The roughness elements consist of parallel square bars set at regular intervals normal to the direction of flow. Radiating internal gravity waves are generated in the early stages of flow, whilst flow separation behind the bars produces turbulent mixing regions which eventually amalgamate and entirely cover the floor. This turbulent layer spreads vertically less rapidly than the internal waves. Observed features of the waves are compared with those predicted by a model in which the floor is assumed to be sinusoidal, and fair agreement is found for the amplitude, phase and vertical wavenumber of the waves, even when the latter becomes large.The rate of spread of the turbulent layer depends on the separation of the bars. Some interaction between the turbulence and the internal waves occurs near the edge of the turbulent layer. Wave-breaking is prevalent and the vertical scale of the waves is affected by turbulent eddies. The radiating internal waves are suppressed by replacing the bars by an array of square cubes, but there is continued evidence of features resembling internal waves near the boundary of the turbulent region. Structures are observed which bear some similarities to those found at the foot of the near-surface mixing layer in a lake.

Experimental study on internal waves in a stratified shear flow

1981 ◽  
Vol 37 (4) ◽  
pp. 179-192 ◽  
Author(s):  
Tadashi Andow ◽  
Kimio Hanawa ◽  
Yoshiaki Toba
Keyword(s):  
Experimental Study ◽  
Shear Flow ◽  
Internal Waves ◽  
Stratified Shear Flow

scholarly journals Coupled Ostrovsky Equations for Internal Waves, with a Background Shear Flow

2014 ◽  
Vol 11 ◽  
pp. 3-14 ◽  
Author(s):  
A. Alias ◽  
R.H.J. Grimshaw ◽  
K.R. Khusnutdinova
Keyword(s):  
Shear Flow ◽  
Internal Waves ◽  
Background Shear

On the shape and breaking of finite amplitude internal gravity waves in a shear flow

1978 ◽  
Vol 85 (1) ◽  
pp. 7-31 ◽  
Author(s):  
S. A. Thorpe
Keyword(s):  
Shear Flow ◽  
Internal Waves ◽  
Gravity Waves ◽  
Second Harmonic ◽  
Mixing Layer ◽  
Phase Speed ◽  
Internal Gravity Waves ◽  
Finite Amplitude ◽  
Depth Interval ◽  
Plane Shear

This paper is concerned with two important aspects of nonlinear internal gravity waves in a stably stratified inviscid plane shear flow, their shape and their breaking, particularly in conditions which are frequently encountered in geophysical applications when the vertical gradients of the horizontal current and the density are concentrated in a fairly narrow depth interval (e.g. the thermocline in the ocean). The present theoretical and experimental study of the wave shape extends earlier work on waves in the absence of shear and shows that the shape may be significantly altered by shear, the second-harmonic terms which describe the wave profile changing sign when the shear is increased sufficiently in an appropriate sense.In the second part of the paper we show that the slope of internal waves at which breaking occurs (the particle speeds exceeding the phase speed of the waves) may be considerably reduced by the presence of shear. Internal waves on a thermocline which encounter an increasing shear, perhaps because of wind action accelerating the upper mixing layer of the ocean, may be prone to such breaking.This work may alternatively be regarded as a study of the stability of a parallel stratified shear flow in the presence of a particular finite disturbance which corresponds to internal gravity waves propagating horizontally in the plane of the flow.

scholarly journals Generation of Vertical Fine Structure by Internal Waves in a Shear Flow

2019 ◽  
Vol 09 (02) ◽  
pp. 140-157
Author(s):  
A. A. Slepyshev ◽  
D. I. Vorotnikov
Keyword(s):  
Fine Structure ◽  
Shear Flow ◽  
Internal Waves
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