HST3D
Category Contaminant transport (3D)
Publisher  US Geological Survey 
Platform DOS, UNIX, DG, Sun
Status Freeware
Description HST3D (Heat and Solute Transport Program) simulates groundwater flow and associated heat and solute transport in three dimensions. The program may be used for analysis of problems such as those related to subsurface waste injection, landfill leaching, saltwater intrusion, freshwater recharge and recovery, radioactive waste disposal, hot water geothermal systems, and subsurface energy storage. The three governing equations are coupled through the interstitial pore velocity, the dependence of the fluid density and fluid viscosity on pressure, temperature, and solute mass fraction. The solute transport equation is for only a single, solute species with possible linear equilibrium sorption and linear decay. Finite difference techniques are used to discretize the governing equations using a point distributed grid. The flow, heat and solute transport equations are solved sequentially after a partial Gauss reduction scheme is used to modify them. The modified equations are more tightly coupled and have better stability for the numerical solutions. The basic source sink term represents wells. A complex well flow model may be used to simulate specified flow rate and pressure conditions at the land surface or within the aquifer, with or without pressure and flow rate constraints. Boundary condition types offered include specified value, specified flux, aquifer and river leakage, heat conduction, an approximate free surface, and two types of aquifer influence functions. All boundary conditions can be functions of time. A restart option is available for storing intermediate results and restarting the simulation at an intermediate time with modified boundary conditions. Output may include tables of dependent variables and parameters, and output files designed for use by post-processing programs for graphical visualization and for flow totalization. There is a preprocessor for evaluating dimensioning requirements and a postprocessor for totalizing boundary flow rates and cumulative amounts.
Cost Free on WWW
Data formats supported None stated
Supplier in United States of America  International Ground Water Modeling Center 
Supplier in United States of America  Scientific Software Group 
Supplier in United States of America  US Geological Survey 

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