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- W1982485925 abstract "A controlled field experiment was conducted to provide data for a one-dimensional numerical model for simulating transient water flow, isotope transport, and heat transfer in the unsaturated zone (ODWISH). The experiment consisted of allowing water to evaporate from homogeneously packed sand columns and periodically sampling to observe changes in the distributions of moisture, temperature, and oxygen-18 enrichment. The peaks of the oxygen-18 distributions were used to determine the value of moisture content at liquid discontinuity, a parameter important for modeling water vapor flow. Modeling transient second-stage evaporation from soil necessitated implementing a retention relation Ψ(θ) that is applicable for dry soils, above the evaporation front, where vapor flow is dominant. A retention model for dry soils was developed, connected to the Van Genuchten model and the resulting two-segment retention relation was implemented in the numerical model. The connection point for the retention relation is the moisture content at liquid discontinuity, which was also used in the numerical model to locate the evaporation front. Simulations showed that the ODWISH model reproduces reasonably well the experimental distributions of moisture content, isotopic enrichment, and temperature, and that the model accounts for the major processes involved in water movement in the shallow unsaturated zone and the associated isotope transport. The most significant discrepancies between the simulations and the experimental data can probably be attributed to inadequencies of the available two-segment Ψ(θ) relationship over the wide range of pressure heads T encountered during the experiment. The ODWISH model was employed to test the sensitivity of the isotope profile development to diurnal variations in temperature and humidity. The results indicated that daily, or even weekly, averages are adequate for predicting isotope profile development." @default.
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- W1982485925 date "1995-09-01" @default.
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- W1982485925 title "Application of a numerical model for simulating water flow, isotope transport, and heat transfer in the unsaturated zone" @default.
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- W1982485925 doi "https://doi.org/10.1016/0022-1694(95)02756-f" @default.
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