Turbulent mixing and entrainment in density driven gravity currents

Details Turbulent mixing and entrainment in density driven gravity currents Turbulent mixing and entrainment in density driven gravity currents

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005iat..work...42d&link_type=abstract

"Proceedings of the workshop on "Interdisciplinary Aspects of Turbulence" Ringberg Castle, Tegernsee, Germany, April 18 - 22,200

Astronomy and Astrophysics

Astrophysics

Scientific paper

We study gravity currents flowing down a uniform slope in a homogeneous media with rotation. Those dense overflows are of particular interest in oceanography, as it is an important mechanism in renewing deep water as part of the global thermohaline convective cycle which has a strong impact on climate. The large Coriolis turntable (Grenoble) is used to study at the laboratory scale, a gravity current in similarity with the oceanic scales. The propagation of such currents is strongly influenced by rotation, and its dynamics is turbulent and unstable, which produces the mixing with the ambient. The experiments are used to determine the stabilization depth of the main current along the coast, to measure the mixing and friction effects in a rotating system and to observe development of instabilities, also seen in the ocean. Scaling laws are derived from the initial parameters, describing the main properties of the flow in geostrophic equilibrium along the slope, such as its position, width, velocity or density. These scaling laws suppose that the buoyancy flux is conserved, which is verified by the experimental data analysis. The intensity of the turbulent stress in these overflows is also investigated, and compared to the formation of cyclonic eddies.

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