Downward propagating internal waves generated at the base of the surface layer of a stratified fluid

Details Downward propagating internal waves generated at the base of the surface layer of a stratified fluid Downward propagating internal waves generated at the base of the surface layer of a stratified fluid

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21..361s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 5, p. 361-364

Physics

4

Internal Waves, Ocean Models, Stratified Flow, Surface Layers, Wave Propagation, Energy Dissipation, Perturbation, Potential Energy, Thermoclines, Turbulent Flow

Scientific paper

Downward propagating internal waves are observed in laboratory experiments. They appear to be generated by the 'obstacle effect' beneath a turbulent surface layer in a surface stress driven stratified flow experiment in a rectangular cavity. The obstacles are the perturbations at the base of the surface layer and the shear is created by a combination of an internal seiche and the circulation in the upper layer. The proportion of energy lost from the surface layer is comparable to increases in potential energy due to vertical entrainment. Consequently, if conditions are favorable, a reduction in vertical entrainment may occur.

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