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A Multiregion Model Describing Water Flow and Solute Transport in Heterogeneous Soils
Author(s) -
Hutson J. L.,
Wagenet R. J.
Publication year - 1995
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1995.03615995005900030016x
Subject(s) - soil water , flow (mathematics) , steady state (chemistry) , diffusion , mechanics , flow conditions , sorption , soil science , water flow , environmental science , hydrology (agriculture) , thermodynamics , geotechnical engineering , chemistry , geology , physics , organic chemistry , adsorption
Many different processes influence chemical breakthrough patterns from soil columns, including chemical kinetics, diffusion, matrix geometry, and flow heterogeneity. TRANSMIT, a multiregion model that reflects many of these features, was used to simulate a suite of solute breakthrough curves from soil columns subjected to both transient and steady‐state flow. When utilized as a two‐region model. TRANSMIT matched analytical solutions for steady‐state flow through two‐region soils. The TRANSMIT model is easily expanded to describe a wide range of multiregion and two‐dimensional geometries and is applicable to transient and steady‐state flow typical of both laboratory experiments and field situations. Sorption and degradation parameters can be varied, and nonuniform surface boundary conditions, resulting from irrigation method and banded chemical placement, can be described.