Density dependent groundwater flow and solute transport below a saline lake bed

Kumar A. Narayan, Craig T. Simmons

Research output: Contribution to journalConference article

Abstract

The movement of salt from a saline lake bed/evaporation basin to the underlying groundwater system is investigated. The density dependent flow behaviour has been modelled in cross section using a 2-D finite element model SUTRA. Due to the inherent salinity contrast between the saline lake brine and groundwater, the system is characterised by a state of density stratification which is the major cause of the resulting instability. Mixed convection flow (hydraulically and buoyancy-driven) occurs which subsequently controls the solute concentrations below the lake bed in order to achieve a stable density gradient (Rayleigh convection). This type of flow regime is particularly relevant to saline disposal basins in the Murray Darling Basin of Australia. Numerical examples simulating 2-D brine convection from lake bed salt, taking moderate 102 to high 105 Rayleigh numbers are given. The conditions which define the onset of such convective phenomena are investigated. Rayleigh number analysis of the convective flow is employed and is seen to be an extremely powerful tool for predicting the long term behaviour of saline evaporation basins.

Original languageEnglish
JournalNational Conference Publication - Institution of Engineers, Australia
Volume94
Issue number14
Publication statusPublished - 1 Dec 1994
Externally publishedYes
EventProceedings of the Water Down Under 1994 Conference. Part 3 (of 3) - Adelaide, Aust
Duration: 21 Nov 199425 Nov 1994

Fingerprint Dive into the research topics of 'Density dependent groundwater flow and solute transport below a saline lake bed'. Together they form a unique fingerprint.

  • Cite this