[Science_Parameters: Science_Category='EARTH SCIENCE', Science_Topic='AGRICULTURE', Science_Term='SOILS']
The Hydrus Water Flow, Heat Movement, and Solute Transport Simulation ProgramEntry ID: HYDRUS-99
Abstract: The HYDRUS program is a finite element model for simulating the one-dimensional movement of water, heat, and multiple solutes in variably saturated media. The program numerically solves the Richards' equation for saturated-unsaturated water flow and Fickian-based advection-dispersion equations for heat and solute transport. The flow equation incorporates a sink term to account for water uptake by ... plant roots. The heat transport equation considers conduction as well as convection with flowing water. The solute transport equations consider advective-dispersive transport in the liquid phase, and diffusion in the gaseous phase. The transport equations also include provisions for nonlinear and/or 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: one which is independent of other solutes, and one which provides the coupling between solutes involved in sequential first-order decay reactions. The program may be used to analyze water and solute movement in unsaturated, partially saturated, or fully saturated porous media.
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Simunek, J., K. Huang, and M. Th. van Genuchten, The HYDRUS code for
simulating the one-dimensional movement of water, heat, and multiple solutes in
variably-saturated media. Version 6.0, Research Report No. 144, U.S. Salinity
Laboratory, USDA, ARS, Riverside, California, 164pp., 1998.
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