Abstract
Reactive transport properties under unsteady unsaturated flow conditions are estimated from field-measured transport data. The data is from a recent field experiment (Dror et al. 1999a,b) in which herbicides (Bromacil, Atrazine, and Terbuthylazine) applied at the soil surface were transported by a few cycles of intermittent irrigation, and concentrations were measured to a depth of 1.2 m by gas chromatography. An analytic stochastic model of flow and reactive transport accounting for multiple infiltration-redistribution cycles is applied in an inverse mode to identify soil and chemical transport properties and measurement uncertainty. Transport, measured at the end of water redistribution, is more sensitive to residual water in the field and less sensitive to the hydraulic conductivity and maximum saturated moisture content. Sorption in the field is found to be less than laboratory-based predictions. The degradation-rate coefficients agree with laboratory measurements.
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Lessoff, S.C., Indelman, P. (2002). Identifying Soil and Transport Properties Using a Model of Infiltration-Redistribution Flow and Transport in the Unsaturated Zone. In: Rubin, H., Shamir, U., Nachtnebel, P., Fürst, J. (eds) Water Resources Quality. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-56013-2_2
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DOI: https://doi.org/10.1007/978-3-642-56013-2_2
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