The water flow part of the model can deal with (constant or time-varying) prescribed head and flux boundaries, boundaries controlled by atmospheric conditions, as well as free drainage boundary conditions. Flow and transport can occur in the vertical, horizontal, or a generally inclined direction. The flow region itself may be composed of nonuniform soils. The program may be used to analyze water and solute movement in unsaturated, partially saturated, or fully saturated porous media. One which provides the coupling between solutes involved in sequential first-order decay reactions. One which is independent of other solutes, and Linear equilibrium reactions between the liquid and gaseous phases, The transport equations also include provisions for:Īnd/orNonequilibrium reactions between the solid and liquid phases, TheSolute transport equations consider advective-dispersive transport in the liquid phase, and diffusion in the gaseous phase. TheHeat transport equation considers conduction as well as convection with flowing water. TheFlow equation incorporates a sink term to account for water uptake by plant roots. The program numerically solves the Richards' equation for saturated-unsaturated water flow and Fickian-based advection dispersion equations for heat and solute transport. The HYDRUS program is a finite element model for simulating theone-dimensional movement of water, heat, and multiple solutes in variably saturated media. The model is supported by an interactive graphics-based interface for data-preprocessing, discretization of the soil profile, and graphic presentation of the results. The software package includes the one-dimensional finite element model HYDRUS (version 7.0) for simulating the movement of water, heat, and multiple solutes in variably saturated media. HYDRUS-1D is a Microsoft Windows-based modeling environment for analysis of water flow and solute transport in variably saturated porous media.
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