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Flow separation in undisturbed soil using multiple anionic tracers (2) steady state core scale rainfall and return flows.

Henderson, D. E. and Reeves, A. D. and Beven, Keith J. and Chappell, Nick A. (1996) Flow separation in undisturbed soil using multiple anionic tracers (2) steady state core scale rainfall and return flows. Hydrological Processes, 10 (11). pp. 1451-1465. ISSN 0885-6087

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Abstract

A series of experiments designed to study the separation of flow components from two large undisturbed cores under steady-state rainfall (downward) and return (upward) flows under near-saturated conditions is summarized. The experiments were conducted on soil columns collected from Lancaster University and the Slapton Wood catchment, Devon. The use of the relatively conservative tracers, potassium bromide, o-(trifluoromethyl)benzoic acid and 2,6-difluorobenzoic acid and a combination of application rates made it possible to quantify the different sources of water contributing to the discharge hydrographs. There is significant retention of tracer within the cores, despite the application of several pore volumes of water. The use of steady flow conditions allowed the determination of dispersion coefficients, dispersivity and proportion of mobile water content parameters of the advection-dispersion equation. It was found that there were significant differences between the dispersivities at different flow-rates under upward and downward flux conditions and that in the undisturbed cores studied here the apparent proportions of mobile pore water ranged between 0.33 and 1.0, with an apparently complex relationship to flux rate. Prediction of transport in undisturbed soil remains problematic and tracer experiments will continue to be needed to provide a fundamental understanding of the complex flow processes involved.

Item Type: Article
Journal or Publication Title: Hydrological Processes
Uncontrolled Keywords: anionic tracers • soil water • solute transport • multicomponent mixing • breakthrough curves • undisturbed soil columns
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 22055
Deposited By: ep_ss_importer
Deposited On: 18 Feb 2009 13:12
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 15:55
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/22055

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