The flow equation incorporates a sink term to account for water uptake by plant roots.

The HYDRUS program numerically solves the Richards equation for saturated-unsaturated water flow and convection-dispersion type equations for heat and solute transport. The HYDRUS program is a finite element model for simulating the two- and three-dimensional movement of water, heat, and multiple solutes in variably saturated media. Users may upgrade to higher Levels from lower Levels, as well as from lower versions (e.g., version 1.x) to higher versions (e.g., version 2 (and higher - in the future)). Users can also opt for relatively simple (two-dimensional rectangular geometries Ã‚Â– 2D-Lite or three-dimensional hexahedral geometries Ã‚Â– 3D-Lite) or more complex geometries (i.e., 2D-Standard for general two-dimensional geometries, 3D-Standard for problems that can be defined using the general two-dimensional base and a layered third dimension, or 3D-Professional for applications with general three-dimensional geometries). Users can select software limited to general two-dimensional applications (the 2D-Standard Level, which corresponds with former Hydrus-2D with MeshGen-2D) or for both two- and three-dimensional applications (i.e., 3D-Standard or 3D-Professional). HYDRUS is distributed in five different versions (Levels) so that users may acquire only that segment of the software that is most appropriate for their application. The model is supported by an interactive graphics-based interface for data-preprocessing, generation of structured and unstructured finite element mesh, and graphic presentation of the results. The model includes a parameter optimization algorithm for inverse estimation of a variety of soil hydraulic and/or solute transport parameters.

The software package includes computational finite element models for simulating the two- and three-dimensional movement of water, heat, and multiple solutes in variably saturated media. HYDRUS is a Microsoft Windows based modeling environment for the analysis of water flow and solute transport in variably saturated porous media.

Hydrus Network 537 free instals