HYD1D is a Galerkin linear finite element program for simulation of transient 1D water flow, single-species solute transport, and heat movement in variably saturated porous media. The program solves the Richard's equation for flow, and convection-dispersion equations for both solute and heat transport. The flow equation considers liquid-phase water flow (no vapor-phase transport), the effects of hysteresis in the soil hydraulic functions, scaled unsaturated soil hydraulic properties, and root uptake of water. The solute transport equation describes the processes of ionic or molecular diffusion, hydrodynamic dispersion, linear or (any) nonlinear equilibrium adsorption, first-order decay, zero-order production, and solute uptake by plants. The equation governing heat movement considers both heat conduction and heat convection. The water flow and solute transport equations assume these properties are not affected by temperature variations. However, the heat transfer properties are assumed to depend on water content and fluid flux. Transfer processes may take place in a vertical, horizontal, or generally inclined direction. Includes a manual, executable, and example problems.

SYSTEM REQUIREMENTS

Intel 80386/80486, 2 Mb of RAM, about 2 Mb free disk space, DOS 3.0 or higher, and a coprocessor. i

Developers: T. Vogel et al.