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This report documents computer program VS2DT for solving problems of solute transport in variably saturated porous media. The program uses a finite-difference approximation to the advection-dispersion equation. The program is an extension to the computer program VS2D developed by the U.S. Geological Survey, which simulates water movement through variably saturated porous media. Simulated regions can be one-dimensional columns, twodimensional vertical cross sections, or axially symmetric, three-dimensional cylinders. Program options include: backward or centered approximations for both space and time derivatives, first-order decay, equilibrium adsorption as described by Freundlich or Langmuir isotherms, and ion exchange. Five test problems are used to demonstrate the ability of the computer program to accurately match analytical and previously published simulation results. Additional modifications to computer program VS2D are included as supplemental information. The computer program is written in standard FORTRAN??. Extensive use of subroutines and function subprograms provides a modular code that can be easily modified for particular applications. A complete listing of datainput requirements and input and output for an example problem are included.

water-resources investigations report

Simulation of solute transport in variably saturated porous media with supplemental information on modifications to the US Geological Survey's computer program VS2D