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Modelling solute transport in structured soils: performance evaluation of the ADR and TRM models

Stagnitti, Frank, Li, Ling, Barry, A., Allinson, G., Parlange, J. -Y., Steenhuis, T. and Lakshmanan, E. 2001, Modelling solute transport in structured soils: performance evaluation of the ADR and TRM models, Mathematical and computer modelling, vol. 34, no. 3-4, pp. 433-440.

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Title Modelling solute transport in structured soils: performance evaluation of the ADR and TRM models
Author(s) Stagnitti, Frank
Li, Ling
Barry, A.
Allinson, G.
Parlange, J. -Y.
Steenhuis, T.
Lakshmanan, E.
Journal name Mathematical and computer modelling
Volume number 34
Issue number 3-4
Start page 433
End page 440
Publisher Pergamon
Place of publication United Kingdom
Publication date 2001-08
ISSN 0895-7177
1872-9479
Keyword(s) Advective-dispersion equation
Preferential flow
Nitrate
Chloride
Phosphate
Pollution
Summary The movement of chemicals through the soil to the groundwater or discharged to surface waters represents a degradation of these resources. In many cases, serious human and stock health implications are associated with this form of pollution. The chemicals of interest include nutrients, pesticides, salts, and industrial wastes. Recent studies have shown that current models and methods do not adequately describe the leaching of nutrients through soil, often underestimating the risk of groundwater contamination by surface-applied chemicals and overestimating the concentration of resident solutes. This inaccuracy results primarily from ignoring soil structure and nonequilibrium between soil constituents, water, and solutes. A multiple sample percolation system (MSPS), consisting of 25 individual collection wells, was constructed to study the effects of localized soil heterogeneities on the transport of nutrients (NO−3, Cl−, PO3−4) in the vadose zone of an agricultural soil predominantly dominated by clay. Very significant variations in drainage patterns across a small spatial scale were observed (one-way ANOVA, p < 0.001 indicating considerable heterogeneity in water flow patterns and nutrient leaching. Using data collected from the multiple sample percolation experiments, this paper compares the performance of two mathematical models for predicting solute transport, the advective-dispersion model with a reaction term (ADR), and a two-region preferential flow model (TRM) suitable for modelling nonequilibrium transport. These results have implications for modelling solute transport and predicting nutrient loading on a larger scale.
Language eng
Field of Research 050305 Soil Physics
Socio Economic Objective 970105 Expanding Knowledge in the Environmental Sciences
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2001, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30001304

Document type: Journal Article
Collections: School of Ecology and Environment
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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.