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Modeling evaporation processes in a saline soil from saturation to oven dry conditions

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Gran Esforzado, Meritxell
Carrera Ramírez, JesúsMés informació
Olivella Pastallé, SebastiàMés informacióMés informacióMés informació
Saaltink, Maarten WillemMés informacióMés informacióMés informació
Document typeArticle
Defense date2011
Rights accessOpen Access
All rights reserved. This work is protected by the corresponding intellectual and industrial property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public communication or transformation of this work are prohibited without permission of the copyright holder
Abstract
Thermal, suction and osmotic gradients interact during evaporation from a salty soil. Vapor fluxes become the main water flow mechanism under very dry conditions. A coupled nonisothermal multiphase flow and a reactive transport model of a salty sand soil was developed to study such an intricate system. The model was calibrated with data from an evaporation experiment (volumetric water content, temperature and concentration). The retention curve and relative permeability functions were modified to simulate oven dry conditions. Experimental observations were satisfactorily reproduced, which suggests that the model can be used to assess the underlying processes. Results show that evaporation is controlled by heat, and limited by salinity and liquid and vapor fluxes. Below evaporation front vapor flows downwards controlled by temperature gradient and thus generates a dilution. Vapor diffusion and dilution are strongly influenced by heat boundary conditions. Gas diffusion plays a major role in the magnitude of vapor fluxes.
CitationGran Esforzado, M. [et al.]. Modeling evaporation processes in a saline soil from saturation to oven dry conditions. "Hydrology and Earth system sciences discussions", 2011, vol. 8, núm. 1, p. 529-554. 
URIhttp://hdl.handle.net/2117/11733
DOI10.5194/hessd-8-529-2011
ISSN1812-2108
Publisher versionhttp://www.hydrol-earth-syst-sci-discuss.net/8/529/2011/hessd-8-529-2011.html
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  • Departament d'Enginyeria del Terreny, Cartogràfica i Geofísica (fins octubre 2015) - Articles de revista [239]
  • MSR - Mecànica del Sòls i de les Roques - Articles de revista [277]
  • GHS - Grup d'Hidrologia Subterrània - Articles de revista [190]
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