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Internal gravity waves generated by an impulsive plume
Phys. Rev. Fluids 4, 014803 – Published 14 January, 2019
DOI: https://doi.org/10.1103/PhysRevFluids.4.014803
Abstract
A series of laboratory experiments on the generation of internal waves by a short duration impulsive, turbulent, forced plume descending into a stratified layer has been conducted. After the plume descends to a maximum depth it rebounds to an equilibrium level where the ensuing oscillation results in the generation of a propagating internal wave field. The finite duration impulsive plumes exhibited two classes of behavior: (1) Plumes with a density that matched that of the bottom of the stratified layer had a constant fraction of the plume energy transferred to the internal wave field, with an average value of , independent of the duration of the plume release. In contrast, (2) plumes with lower densities, half that of the bottom of the stratified layer, exhibited a larger degree of coupling of the plume energy to the internal wave field that increased with the duration of the plume release, having an average value of . The observed degree of internal wave energy coupling for impulsive plumes is in general agreement with prior studies of continuous convective plumes and descending buoyant parcels.
Physics Subject Headings (PhySH)
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