Woods Hole Oceanographic Institution

Claudia Cenedese

»Cyclone and anticyclone asymmetry in a rotating stratified fluid over bottom topography
»Eddy-shedding from a boundary current around a cape over a sloping bottom
»Stability of a buoyancy-driven coastal current at the shelf break
»Laboratory experiments on mesoscale vortices colliding with a seamount
»A dense current flowing down a sloping bottom in a rotating fluid
»A laboratory model of thermocline depth and exchange fluxes across circumpolar fronts
»Laboratory experiments on a mesoscale vortex colliding with topography of varying geometry in a rotating fluid
»Variability of Antarctic bottom water flow into the North Atlantic
»Laboratory experiments on mesoscale vortices interacting with two islands
»Laboratory experiments on eddy generation by a buoyant coastal current flowing over variable bathymetry
»How entraining density currents influence the stratification in a one-dimensional ocean basin
»Laboratory observations of enhanced entrainment in dense overflows in the presence of submarine canyons and ridges
»Laboratory experiments on mesoscale vortices colliding with an island chain
»Mixing in a density-driven current flowing down a slope in a rotating fluid
»Variations in ocean surface temperature due to near surface flow: straining the cool skin layer
»Laboratory experiments on the interaction of a buoyant coastal current with a canyon: application to the East Greenland Current
»A new parameterization for entrainment in overflows
»The relationship between flux coefficient and entrainment ratio in density currents
»Impact of fjord dynamics and glacial runoff on the circulation near Helheim Glacier
»Laboratory experiments on two coalescing axisymmetric turbulent plumes in a rotating fluid
»Entrainment and mixing dynamics of surface-stress-driven stratifi ed flow in a cylinder
»Downwelling in Basins Subject to Buoyancy Loss
»A Geostrophic Adjustment Model of two Buoyant Fluids
»Offshore Transport of Shelf Waters through Interaction of Vortices with a Shelfbreak Current
»Laboratory experiments and observations of cyclonic and anticyclonic eddies impinging on an island
»Seasonal variability of submarine melt rate and circulation in an East Greenland fjord
»The Dispersal of Dense Water Formed in an Idealized Coastal Polynya on a Shallow Sloping Shelf
»Entrainment in two coalescing axisymmetric turbulent plumes
»Dynamics of Greenland¬ís glacial fjords and their role in climate
»Impact of periodic intermediary flows on submarine melting of a Greenland glacier
»Gravity Current Propagation Up a Valley
»On the collision of sea breeze gravity currents

Shravat A., Cenedese C. and Caulfield C.P., Entrainment and mixing dynamics of surface-stress-driven stratifi ed flow in a cylinder, J. Fluid Mech., 691, 498-517, 2012

We extend previous work of Boyer, Davies & Guo (Fluid Dyn. Res., vol. 21, 1997, pp. 381–401) to consider the evolution of an initially two-layer stratified fluid in a cylindrical tank which is driven by a horizontal rotating disk. The turbulent motions induced by the disk drive entrainment at the interface, and similarly to the results of Boyer et al. (1997), the layer nearer to the disk deepens. Through high-frequency conductivity probe measurements, we establish that the deepening layer is very wellmixed, and the thickness of the interface between the two evolving layers appears to be approximately constant. Under certain circumstances, we find that the rate of increase in depth of the deepening layer decreases with time, at variance with the results of Boyer et al. (1997), and implying that the characteristic velocity in the deepening layer decreases as the upper layer deepens. We propose that such time-dependent deepening, and the associated weakening of the upper-layer velocities, occurs naturally because of the combined power requirements of entrainment and layer homogenization which inhibit, when the stratification is very strong, the characteristic velocities of the deepening layer approaching the (constant) velocities of the driving disk, as assumed by Boyer et al. (1997).

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