Strathprints Home | Open Access | Browse | Search | User area | Copyright | Help | Library Home | SUPrimo

Instability of the salinity profile during the evaporation of saline groundwater

Il'ichev, Andrej T. and Tsypkin, George G. and Pritchard, David and Richardson, Chris N. (2008) Instability of the salinity profile during the evaporation of saline groundwater. Journal of Fluid Mechanics, 614. pp. 87-104. ISSN 0022-1120

This is the latest version of this item.

[img]
Preview
PDF (strathprints015970.pdf)
Download (230Kb) | Preview

    Abstract

    We investigate salt transport during the evaporation and upflow of saline groundwater. We describe a model in which a sharp evaporation-precipitation front separates regions of soil saturated with an air-vapour mixture and with saline water. We then consider two idealised problems. We first investigate equilibrium configurations of the fresh-water system when the depth of the soil layer is finite, obtaining results for the location of the front and for the upflow of water induced by the evaporation. Motivated by these results, we develop a solution for a propagating front in a soil layer of infinite depth, and we investigate the gravitational stability of the salinity profile which develops below the front, obtaining marginal linear stability conditions in terms of a Rayleigh number and a dimensionless salt saturation parameter. Applying our findings to realistic parameter regimes, we predict that salt fingering is unlikely to occur in low-permeability soils, but is likely in high-permeability (sandy) soils under conditions of relatively low evaporative upflow.

    Item type: Article
    ID code: 15970
    Keywords: salt transport, evaporation, salinity, soils, Mathematics, Mechanics of Materials, Mechanical Engineering, Condensed Matter Physics
    Subjects: Science > Mathematics
    Department: Faculty of Science > Mathematics and Statistics
    Related URLs:
    Depositing user: Mrs Mary McAuley
    Date Deposited: 10 Feb 2010 14:48
    Last modified: 05 Sep 2014 13:42
    URI: http://strathprints.strath.ac.uk/id/eprint/15970

    Available Versions of this Item

    Actions (login required)

    View Item

    Fulltext Downloads: