Skip Navigation | ANU Home | Search ANU | Directories
The Australian National University
Research School of Earth Sciences
Printer Friendly Version of this Document
Search RSES
Stratified turbulence and mixing

Stratified turbulence and mixing:

Stratified flow over topography photo
Violent overturning events and turbulence are produced in a density-stratified fluid by numerous mechanisms including shear instability, wave breaking and interaction of the flow with topography. Mixing and energy dissipation occurs as a consequence. In the stratified environments of the oceans and atmosphere, we are usually interested in how much down-gradient density transport there is.
Hydraulic exchange photo
We are currently quantifying the mixing in exchange flows past constrictions and sills as a result of shear instabilities. These processes are relevant to the flows in ocean straits, where the mixing has important consequences for the transport of heat, salt and mass.

Recent relevant publications:

Hogg, A. McC. & Hughes, G. O. 2006 Shear flow and viscosity in single-layer hydraulics. J. Fluid. Mech. 548, 431–443.

Prastowo, T., Griffiths, R. W., Hughes, G. O. & Hogg, A. McC. 2008 Mixing efficiency in controlled exchange flows. J. Fluid. Mech. 600, 235–244.

Prastowo, T., R. W. Griffiths, Hughes, G. O. & Hogg, A. McC. 2009 Effects of topography on the cumulative mixing efficiency in exchange flows. J. Geophys. Res. 114, C08008, doi:10.1029/2008JC005152.