Summary The Galloway research team has developed and documented three computer models (AIR2D, AIR3D, and R-UNSAT) for simulating flow and transport in the unsaturated zone that are available to the public. These models were funded by the Toxics Substances Hydrology Program. The computer codes are written in Fortran F77 and run on a variety of computer systems, including ... mainframe and personal computers, with only minor adaptations. The programs are written in a modular structure which facilitates modifications to the source code. Whenever these modifications are made, the program must be recompiled with a Fortran F77 compiler to incorporate the changes in the executable versions of the program code. The commands needed to link and compile the program depend on the type of compiler being used.
R-UNSAT is a computer model for the simulation of reactive, multispecies transport in a heterogeneous, variably-saturated porous media. R-UNSAT was designed for simulating transport of volatile organic compounds in the unsaturated zone from point and nonpoint sources, but can also be applied to other unsaturated-zone transport problems involving gas diffusion, such as radon migration and the deposition of compounds from the atmosphere to shallow ground water. In a calibrative mode, R-UNSAT can be used to estimate rates of mass transport, biodegradation and volatilization rates, or transport properties of unsaturated-zone sediments. In a predictive mode, R-UNSAT can be used to predict the distribution of a species as a function of time and space and to estimate mass-loss or loading rates to ground water.
Use Constraints The computer model source code written in Fortran 77. It is assumed that users have access to a Fortran compiler. Users who do not have access to a Fortran compiler may request executable files by contacting Matthew A. Lahvis or Arthur L. Baehr at (609-771-3900).
Name:
RICHARD
H.
KROPP
Phone:
(609) 771-3901
Fax:
(609) 771-3915
Email:
rkropp at usgs.gov
Contact Address:
New Jersey District Chief
U.S. Geological Survey
810 Bear Tavern Road, Suite 206 City:
West Trenton
Province or State:
NJ
Postal Code:
08628
Country:
USA
Distribution Media
Distribution_Media:
electronic
Distribution_Size:
47KB
Distribution_Format:
fortran code in a zipped file
Personnel
MATTHEW
A.
LAHVIS Role:
TECHNICAL CONTACT
Phone:
609-771-3900
Contact Address:
U.S. Geological Survey
810 Bear Tavern Road City:
West Trenton
Province or State:
New Jersey
Postal Code:
08628
Country:
USA
ARTHUR
L.
BAEHR Role:
TECHNICAL CONTACT
Phone:
609-771-3978
Email:
abaehr at usgs.gov
Contact Address:
U.S. Geological Survey
810 Bear Tavern Road City:
West Trenton
Province or State:
New Jersey
Postal Code:
08628
Country:
United States
TYLER
B.
STEVENS Role:
SERF AUTHOR
Phone:
(301) 614-6898
Fax:
301-614-5268
Email:
Tyler.B.Stevens at nasa.gov
Contact Address:
NASA Goddard Space Flight Center
Global Change Master Directory City:
Greenbelt
Province or State:
MD
Postal Code:
20771
Country:
USA
Link:
VIEW RELATED INFORMATION
Description:
R-UNSAT read.me file that describes the installation and
execution procedures.
Link:
GET RELATED SERVICE METADATA (SERF)
Description:
AIR2D is a flow model for simulating the movement of air to or from a
single borehole screened in the unsaturated zone and can be applied to
predict a steady-state flow field associated with vapor extraction.
Link:
GET RELATED SERVICE METADATA (SERF)
Description:
AIR3D is an adaptation of the ground-water flow code MODFLOW to
simulate three dimensional air-flow in a heterogeneous, anisotropic
unsaturated zone where air flow is induced through dry wells or
trenches, as in vapor- extraction remediation.
Publications/References Baehr, A.L., 1987, Selective transport of hydrocarbons in the unsaturated zone due to aqueous and vapor phase partitioning: Water Resources Research, v. 23, p. 1926-1938.
Lahvis, M.A., and Baehr, A.L., 1996, Estimation of rates of aerobic hydrocarbon biodegradation by simulation of gas transport in the unsaturated zone: Water Resources Research, v. 32, ... p. 2231-2249.
____ 1997, Documentation of R-UNSAT, a computer model for the simulation of reactive, multispecies transport in the unsaturated zone: U. S. Geological Survey Open-File Report 97-630, 104 p.
Landmeyer, J.E., Chapelle, F.H.,and Bradley, P.M., 1996, Assessment of intrinsic bioremediation of gasoline contamination in the shallow aquifer, Laurel Bay Exchange, Marine Corps Air Station, Beaufort, South Carolina: U.S. Geological Survey Water-Resources Investigations Report 96-4026, 50 p.
McAllister, P.M., and Chiang, C.Y., 1994, A practical approach to evaluating natural attenuation of contaminants in ground water: Ground Water Monitoring Review, v. 14, p. 161-173.
Squillace, P.J., Zogorski, J.S., Wilber, W.G., and Price, C.V., 1995, A preliminary assessment of the occurrence and possible sources of MTBE in ground water of the United States, 1993-94: U.S. Geological Survey Open-File Report 95-456, 15 p.
Tremblay, D., Tulis, D., Kostecki, P., and Ewald, K., 1995, Innovation skyrockets at 50,000 LUST sites: Soil and Groundwater Cleanup, December 1995, p. 6-13.
U.S. Environmental Protection Agency, 1991, OUST corrective action 45-day study team report: U.S. Environmental Protection Agency, Office of Underground Storage Tanks, Washington, D.C.
Links
