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The transport models also account for convection and dispersion in the liquid phase, as well as diffusion in the gas phase, thus permitting the model to simulate solute transport simultaneously in both the liquid and gaseous phases.
The C-Ride module (1D; previously available in 2D) simulates colloid-facilitated solute
transport.
The transport of environmental Isotopes without fractionation or with constant fractionation
(in 1D) during evaporation.
For solute transport, the code supports both (constant and varying) prescribed concentration (Dirichlet or first-type) and concentration flux (Cauchy or third-type) boundaries. The dispersion tensor includes a term reflecting the effects of molecular diffusion and tortuosity.
The unsaturated soil hydraulic properties are described using Genuchten [1980], Brooks and Corey [1964], Durner [1994], Kosugi [1995], and modified Genuchten type analytical functions. Modifications were made to improve the description of hydraulic properties near saturation.
HYDRUS version 5 merges two previously independent software packages HYDRUS-1D (version 4, for
one-dimensional applications) and HYDRUS (2D/3D) (version 3, for two- and three-dimensional
applications).
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