Jl. Hutson et Rj. Wagenet, A MULTIREGION MODEL DESCRIBING WATER-FLOW AND SOLUTE TRANSPORT IN HETEROGENEOUS SOILS, Soil Science Society of America journal, 59(3), 1995, pp. 743-751
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 breakth
rough curves from soil columns subjected to both transient and steady-
state Bow. When utilized as a two-region model, TRANSMIT matched analy
tical solutions for steady-state how through two-region soils. The TRA
NSMIT model is easily expanded to describe a wide range of multiregion
and two-dimensional geometries and is applicable to transient and ste
ady-state Bow typical of both laboratory experiments and field situati
ons. Sorption and degradation parameters can be varied, and nonuniform
surface boundary conditions, resulting from irrigation method and ban
ded chemical placement, can be described.