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- W1967477029 abstract "Abstract A solute transport study was designed to test the validity of the convection-dispersion model in a series of experiments which varied soil column width and length. The studies were performed at three steady-state water flux rates (8, 4, 2 cm d −1 in both undisturbed and packed columns containing Tujunga loamy sand. The series of experiments for both undisturbed and repacked soil began with three 87-cm-long soil columns of inner diameter 10, 15 and 20 cm. Pulses of CaCl 2 were leached through each column at each flow rate, after which the columns were cut in half and the experiments repeated with the upper 43.5 cm of the old columns. Finally, the columns were cut a second time and the upper 21.8-cm columns were used in the final set of experiments. The resulting breakthrough curves were used to test two solute transport models, the one dimensional convection-dispersion equation, CDE, and the mobile-immobile water model, MIM. The breakthrough curves from the undisturbed soil were very skewed, showing both early breakthrough and extensive tailing, whereas the outflow pulses from the repacked columns were symmetric. The CDE dispersion coefficient D or dispersitivity λ significantly increased with increasing column length in the undisturbed soil columns at the higher flux rates, but D was length-independent and considerably smaller in the repacked columns than in the undisturbed soil experiments. Although the MIM model gave a good description of the extensive tailing of the breakthrough curves in any single outflow experiment, its refitted parameters showed no consistent relationship with any of the experimental variables and were generally not invariant with length." @default.
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- W1967477029 date "1990-01-01" @default.
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- W1967477029 title "A laboratory study of the dispersion scale effect in column outflow experiments" @default.
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- W1967477029 doi "https://doi.org/10.1016/0169-7722(90)90001-w" @default.
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