Simulation of Solute Transport in Variably Saturated Porous Media with Supplemental Information on Modifications to the U.S. Geological Survey's Computer Program VS2D

摘要

The report describes computer program VS2DT that simulates solute transport in porous media under variably saturated conditions. The program is an extension to the U.S. Geological Survey's computer program VS2D (Lappala and others, 1987), which simulates water movement through variably saturated porous media. The extension consists of four new subroutines and slight modifications to existing routines. VS2DT may be a useful tool in studies of water quality, ground-water contamination, waste disposal, or ground-water recharge. The program is user oriented and easy to use. However, its use must be accompanied by an awareness of the assumptions and limitations inherent in its development. The report describes theory and numerical implementation of the solute transport model. Details on simulation of water flow are contained in Lappala and others (1987), therefore little additional information on the topic is included in the report. Potential users of VS2DT should obtain a copy of Lappala and others (1987). The program is verified by comparing results to analytical solutions and previously published simulation results. Detailed description of data-input requirements and program structure are also included. Some additional modifications to computer program VS2D are presented as supplemental information.