Mechanisms controlling evaporation of a saline film

M. I. Dragila, E. M. Gitelman, N. Weisbrod

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Understanding salt precipitation dynamics during evaporation of saline and sodic soils is necessary for the improvement of agricultural conditions of those soils. In a series of highly controlled laboratory experiments, we found that evaporation of saline solution (copper sulfate) from both homogenous and heterogeneous porous media produces an initial crust followed by subsequent banding patterns. The salt precipitation site represents a rough approximation of the evaporation front. The spacing of the sub fluoresecnt deposition sites indicate that the evaporation front is receding in a non-smooth fashion. During the experiments, mass, matric-potential, and photo data were collected. The data indicates that salt precipitates in from the film region of capillary fringe, and thus many contributing mechanisms control this banding phenomena, particularly surface tension and its' variation with concentration.
Original languageAmerican English
Title of host publicationAmerican Geophysical Union, Fall Meeting 2011
Volume33
StatePublished - 1 Dec 2011

Keywords

  • 1818 HYDROLOGY / Evapotranspiration
  • 1831 HYDROLOGY / Groundwater quality
  • 1866 HYDROLOGY / Soil moisture

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