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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.
Examples demonstrating the use of the standard add-on module DualPerm, simulating flow and transport in dual-permeability media. Download now
HP2 Examples demonstrating the use of the standard add-on module HP2 (coupled Hydrus (2D/3D) and PHREEQC [Parkhurst and Appelo, 1999]).
Version 3.0, released in early May of 2018, is the first major upgrade of HYDRUS since 2011. In this version, we have included in the standard computational modules a new flexible Reservoir Boundary Condition (in 2D), expanded Root Growth features, included an inverse option for 3D, and added many new graphical capabilities of the GUI. Detailed description of new features and changes in Version 3.01 of HYDRUS (2D/3D) are given in Šimůnek et al. (2018). Version 3.2 includes new modules Furrow 3D that describes the coupled surface-subsurface flow and transport processes occurring during furrow irrigation and fertigation and Slope Cube 3D that additionally calculates transient fields of soil suction, suction stress, total and effective stresses, and local factor of safety.
The resulting equations are solved in an iterative fashion, by linearization and subsequent Gaussian elimination for banded matrices, a conjugate gradient method for symmetric matrices, or the ORTHOMIN method for asymmetric matrices.
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