Modeling the influence of MgSO4 invariant points on multiphase reactive transport process during saline soil evaporation |
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| Institution: | 1. Zürich University of Applied Sciences, Winterthur, Switzerland;2. Swiss Federal Institute of Technology, Centre for Imaging Science and Technology, Zürich, Switzerland;3. EMPA, Materials Science and Technology, Electron Microscopy Center EMPA, CH-8600 Dübendorf, Switzerland;1. U.S. Geological Survey, Woods Hole Coastal and Marine Science Center, 384 Woods Hole Road, Woods Hole, MA 02543-1598, USA;2. U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center, 600 Fourth Street South, St. Petersburg, FL 33701, USA;3. Center for Marine and Wetland Studies, Coastal Carolina University, 1270 Atlantic Avenue, Conway, SC 29526, USA |
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| Abstract: | In the present work, we modeled a laboratory experiment where a sand column saturated with a MgSO4 solution is subject to evaporation. We used a compositional formulation capable of representing the effect of geochemistry on flow and transport for concentrated solutions under extreme dry conditions. The model accounts for the water sink/sources terms due to hydrated mineral dissolution/precipitation and the occurrence of invariant points, which prescribe the water activity. Results show that the occurrence of the invariant points at the top of the domain could affect the vapor flux at the column top and salt precipitation along the column. In fact, the invariant points occurrence could explain the spatial fluctuation on the salt precipitates formation. Results also suggest that the complex hydrochemical interactions occurring during soil salinization, including osmotic effects, are crucial not only to understand the salt precipitation, but also the evaporation rate. |
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