The numerical models used for flow and transport calculations are the U.S. Geological Survey's computer models VS2DT (for solute transport) and VS2DH (for energy transport). These models have been updated to version 3.2 for implementation in the VS2DI package.
Experienced users of VS2DT and VS2DH will find that it is now much easier to construct simulations and to analyze results.
Users unfamiliar with VS2DT and VS2DH will find that the VS2DI package allows for easy and rapid examination of water and contaminant (or heat) movement through various different hydrologic regimes. It is an excellent tool for hypothesis testing (for example, for looking at the influence that the shape, position, and hydraulic characteristics of a layer of low permeability have on the movement of a contaminant infiltrating from the soil surface). VS2DI is also very useful for teaching the basics of soil physics and subsurface contaminant transport. Typical applications of the programs are for studies of ground-water recharge, surface-water-ground-water exchange, and contaminant transport from waste disposal sites. An extensive on-line help manual provides all the information necessary to run the programs.
Lappala, E.G., Healy, R.W., and Weeks, E.P., 1987, Documentation
of computer program VS2D to solve the equations of fluid flow in
variably saturated porous media: U.S. Geological Survey Water-Resources
Investigations Report 83-4099, 184 p.
An electronic version of the report can be downloaded from:
http://pubs.er.usgs.gov/pubs/wri/wri834099
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