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Effects of Chemical Reaction Variability on Preferential Flow

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Pp. 45-48 in Preferential Flow, Water Movement and Chemical Transport in the Environment, Proc. 2nd Int. Symp. (3-5 January 2001, Honolulu, Hawaii, USA), eds. D. D. Bosch and K. W. King. St. Joseph, Michigan: ASAE  701P0006.(doi:10.13031/2013.2126)
Authors:   Chittaranjan Ray, Tomas A. Vogel, and Horst H. Gerke
Keywords:   Preferential flow, dual-permeability, sorption variability, macropore

Water flow and chemical transport in structured soils or soils with macropore features have been modeled using dual or multi-continuum approaches. For dual continuum (also referred to as dual-permeability) media, it is assumed that both the matrix and macropore domains contribute to solute advection and dispersion at differing rates based upon pore-water velocity in the respective domains. In this paper, we present some of the factors such as variability in sorption and biodegradation between the two domains and with depth which may lead to further variations in solute concentration profiles in these soils. In addition, we find that the land management practices such as tillage and organic amendment cause a variation in organic carbon profile. Through sensitivity analysis, we show that the effect of sorption and degradation variability on 2,4-D concentration profile.

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