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dc.contributor.advisorDutt, Gordon R.en_US
dc.contributor.authorArslan, Awadis.
dc.creatorArslan, Awadis.en_US
dc.date.accessioned2011-10-31T17:31:41Z
dc.date.available2011-10-31T17:31:41Z
dc.date.issued1990en_US
dc.identifier.urihttp://hdl.handle.net/10150/185231
dc.description.abstractA computer simulation model was developed to simulate the impact of irrigating soils containing gypsic horizons on soil water quality and percolated water quality. The model simulates saturated - unsaturated solute movement using the mixing cell approach to simulate dispersion and movement of soluble salts. Dissolution and precipitation of slightly soluble salts and the formation of ion pairs is considered as a function of temperature. Van Genuchten closed form equation is used to find soil water retention function. Finite difference method was applied to Richards equation for moisture movement simulation in the profile. The model predicts the concentration of the major cations and anions in each segment. The regression coefficients of the observed vs. simulated concentration of the major ions were higher than 0.961 in all the three replicates with slopes ranging between 0.717 and 0.940. Running the model at 1 and 41 °C showed significant differences in Ca, SO₄, and HCO₃ concentrations in the percolated water. However, the differences in Cl, Na, and Mg concentrations were not significant. The presence of high Ca and SO₄ concentrations in the irrigation water reduced gypsum solubility in soils containing a layer of gypsum compared with the presence of Mg and Cl in the irrigation water.
dc.language.isoenen_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.subjectAgricultureen_US
dc.titleModeling water quality for soils containing gypsic horizons.en_US
dc.typetexten_US
dc.typeDissertation-Reproduction (electronic)en_US
dc.identifier.oclc710113376en_US
thesis.degree.grantorUniversity of Arizonaen_US
thesis.degree.leveldoctoralen_US
dc.contributor.committeememberBales, Rogeren_US
dc.contributor.committeememberStroehlein, Jack L.en_US
dc.contributor.committeememberWarrick, Arthur W.en_US
dc.identifier.proquest9111920en_US
thesis.degree.disciplineSoil and Water Sciencesen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.namePh.D.en_US
refterms.dateFOA2018-05-18T10:41:56Z
html.description.abstractA computer simulation model was developed to simulate the impact of irrigating soils containing gypsic horizons on soil water quality and percolated water quality. The model simulates saturated - unsaturated solute movement using the mixing cell approach to simulate dispersion and movement of soluble salts. Dissolution and precipitation of slightly soluble salts and the formation of ion pairs is considered as a function of temperature. Van Genuchten closed form equation is used to find soil water retention function. Finite difference method was applied to Richards equation for moisture movement simulation in the profile. The model predicts the concentration of the major cations and anions in each segment. The regression coefficients of the observed vs. simulated concentration of the major ions were higher than 0.961 in all the three replicates with slopes ranging between 0.717 and 0.940. Running the model at 1 and 41 °C showed significant differences in Ca, SO₄, and HCO₃ concentrations in the percolated water. However, the differences in Cl, Na, and Mg concentrations were not significant. The presence of high Ca and SO₄ concentrations in the irrigation water reduced gypsum solubility in soils containing a layer of gypsum compared with the presence of Mg and Cl in the irrigation water.


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