Buoyancy perturbations (-g ρ' / ρ0) in internal gravity waves generated
by a compact source in a Boussinesq fluid
by Dale Durran, Rajul Pandya, and Lucas Harris
Positive (red) and negative (blue) buoyancy perturbations are plotted in a vertical plane. Observe that:
- The leading edge of the x-shaped region of disturbed flow extends
outward from the source at the group velocity.
- The lines of constant phase run parallel to these x-shaped arms.
- The phase speed is perpendicular to the group velocity in a sense
such that the phase lines appear to propagate toward a horizontal line
passing through the location of the source.
Zoom in to view fluid-parcel motions in the vicinity of the upper right
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This material is based upon work supported by the National Science Foundation under Grant No. ATM-0225441.
Last edited 16 Oct 08