![]() ![]() HYDRUS may be used to analyze water and solute movement in unsaturated, partially saturated, or fully saturated porous media. Attachment/detachment theory, including filtration theory, is additionally included to enable simulations of the transport of viruses, colloids, and/or bacteria. In addition, physical nonequilibrium solute transport can be accounted for by assuming a two-region, dual-porosity type formulation which partitions the liquid phase into mobile and immobile regions. ![]() The transport equations also include provisions for nonlinear nonequilibrium reactions between the solid and liquid phases, linear equilibrium reactions between the liquid and gaseous phases, zero-order production, and two first-order degradation reactions. The solute transport equations consider advective-dispersive transport in the liquid phase, as well as diffusion in the gaseous phase. ![]() The heat transport equation considers transport due to conduction and convection with flowing water. The flow equation incorporates a sink term to account for water uptake by plant roots. The HYDRUS program numerically solves the Richards equation for variably saturated water flow and advection-dispersion equations for both heat and solute transport. September 2023: New version HYDRUS 5.03 has been released - see New Features HYDRUS version 5 was released in April 2022 and it 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). This list also includes almost 50% of the World's top 100 universities 2014. HYDRUS is currently being used by more than 3000 companies and institutions from around the world - see the list of selected customers. The program can be extended with a number of special add-on modules. HYDRUS is a Windows application for simulating water, heat, and solute movement in one-, two- and three-dimensional variably saturated media. ![]()
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