Abstract
Field-scale solute dispersivities are derived in a macroporous sandy-loam soil for unsaturated and saturated flow conditions from unconditional numerical simulations of solute transport. Heterogeneous soils are generated using geostatistical information on soil hydraulic properties. The effect of the measurement technique, size and saturation degree of the soil sample on the geostatistical parameters of the soil hydraulic properties and on the simulated field-scale dispersivities is investigated. A comparison of field-scale dispersivities derived from simulated and measured solute concentrations reveals that for unsaturated flow conditions, the heterogeneity of hydraulic conductivities measured under unsaturated conditions and on small soil samples gives the best results. For saturated flow conditions, the simulated dispersivities largely underpredict the measured dispersivities. This is because flow and transport heterogeneity due to macropore activation cannot be described by the heterogeneity of macroscopic hydraulic properties.
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© 1997 Springer Science+Business Media Dordrecht
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Vanderborght, J., Jacques, D., Mallants, D., Tseng, P ., Feyen, J. (1997). Analysis of Solute Redistribution in Heterogeneous Soil. In: Soares, A., Gómez-Hernandez, J., Froidevaux, R. (eds) geoENV I — Geostatistics for Environmental Applications. Quantitative Geology and Geostatistics, vol 9. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-1675-8_24
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DOI: https://doi.org/10.1007/978-94-017-1675-8_24
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