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• W2188708045 abstract "In soils of the Loess Plateau containing macrospores, both water and solute transport can move preferentially, bypassing much of the soil matrix. The objective of this study was to examine the effect of solute input methods with small pulse input and large pulse input and four pore water velocities on preferential solute transport through undisturbed loessial soil columns collected from the Loess Plateau. Chloride breakthrough curves (BTCs) were generated using the miscible displacement method under water-saturated, steady flow conditions. Using the same column, 0.15 mol L-1CaCl2 solution was added, first in a small pulse (0.1 pore volumes) and second, after recovery, a large pulse (0.5 pore volumes). The convection-dispersion equation (CDE) and the two-region model (T-R) were used to describe the BTCs ,and their prediction accuracies were compared. All the BTCs obtained for the different input methods and the four pore water velocities were all smooth and had a single-peak. However, the shapes of the BTCs varied greatly; small pulse inputs resulted in more rapid attainment of peak values that appeared earlier within creases in pore water velocity whereas large pulse inputs resulted in an opposite trend. Both models could fit the experimental data well, but the prediction accuracy of the two-region model was better. The values of the dispersivity, lambda, calculated from the dispersion coefficient obtained from the CDE were about one order of magnitude larger than those calculated from the dispersion coefficient given by the two-region model, but the calculated Pelect number, Pe, was lower. The mobile-immobile partition coefficient, beta, decreased while the mass exchange coefficient increased with increases in pore water velocity." @default.
• W2188708045 created "2016-06-24" @default.
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• W2188708045 date "2013-01-01" @default.
• W2188708045 modified "2023-09-24" @default.
• W2188708045 title "Experimental study on preferential solute transport in a Loess Plateau soil." @default.
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