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J. Šimůnek1, M. Th. van Genuchten2, M. Šejna, N. Toride, F. Leij

1Department of Environmental Sciences

University of California, Riverside, CA, 92521, USA

2Department of Mechanical Engineering

Federal University of Rio de Janeiro, Brazil





STANMOD (STudio and ANalytical MODels) is a public-domain Windows-based computer software package for evaluating solute transport in soils and groundwater using analytical solutions of the advection-dispersion equation (ADE). The software integrates seven separate codes that have been used over the years for a broad range of one- and multi-dimensional solute transport problems: the CFITM, CFITIM, CXTFIT, CHAIN, and SCREEN models for one-dimensional applications, and the 3DADE and N3DADE models for multi-dimensional problems. All models can be run for direct (forward) problems, and several (CFITM, CFITM, CXTFIT, and 3DADE) also for inverse problems. CXTFIT further includes a stochastic stream tube model assuming local-scale equilibrium or nonequilibrium transport conditions. The 3DADE and N3DADE models apply to two- and three-dimensional transport during steady unidirectional water flow assuming equilibrium and nonequilibrium transport, respectively. Nonequilibrium transport can be simulated using the assumption of either physical nonequilibrium (dual-porosity, two-region or mobile-immobile type transport) or chemical nonequilibrium (one-site kinetic, or two-site partial equilibrium, partial kinetic sorption). STANMOD  comes with a large number of example applications illustrating the utility of the different codes for a variety of laboratory and field-scale solute transport problems. 



System Requirements

Intel Pentium or higher processor, 16 Mb RAM, hard disk with at least 20 Mb free disk space, VGA graphics (High Color recommended), MS Windows 95, 98, NT, 2000, XP, Vista (32/64-bit), Windows 7 (32/64-bit) and Windows 8 (32/64-bit).


STANMOD Manuals and Key References

Jury, W. A., W. F. Spencer, and W. J. Farmer, Behavior assessment model for trace organics in soil: I. Description of model. J. Environ. Qual., 12(4), 558-564, 1983.

Leij, F. J., and S. A. Bradford, 3DADE: A computer program for evaluating three-dimensional equilibrium solute transport in porous media, Research Report No. 134, U. S. Salinity Laboratory, USDA, ARS, Riverside, CA, 1994. ( Download PDF, 7Mb)

Leij, F. J., and N. Toride, N3DADE: A computer program for evaluating nonequilibrium three-dimensional equilibrium solute transport in porous media, Research Report No. 143, U. S. Salinity Laboratory, USDA, ARS, Riverside, CA, 1997. ( Download PDF, 10Mb)

Parker, J. C., and M. Th. van Genuchten, Determining transport parameters from laboratory and field tracer experiments, Bull. 84-3, Va Agric. Exp. St., Blacksburg, Va, 1984.

Šimůnek, J., M. Th. van Genuchten, M. Šejna, N. Toride, and F. J. Leij, The STANMOD computer software for evaluating solute transport in porous media using analytical solutions of convection-dispersion equation. Versions 1.0 and 2.0, IGWMC - TPS - 71, International Ground Water Modeling Center, Colorado School of Mines, Golden, Colorado, 32 pp., 1999.

Šimůnek, J., M.Th. van Genuchten, and M. Sejna. Development and applications of the HYDRUS and STANMOD software packages and related codes, Vadose Zone J. 7: 587-600, 2008.

Toride, N., F. J. Leij, and M. Th. van Genuchten, The CXTFIT code for estimating transport parameters from laboratory or field tracer experiments. Version 2.0, Research Report No. 137, U. S. Salinity Laboratory, USDA, ARS, Riverside, CA, 1995.

van Genuchten, M. Th., Determining transport parameters from solute displacement experiments, Research Report No. 118, U. S. Salinity Laboratory, USDA, ARS, Riverside, CA, 1980. ( Download PDF, 2.7Mb)

van Genuchten, M. Th., Non-equilibrium transport parameters from miscible displacement experiments, Research Report No. 119, U. S. Salinity Laboratory, USDA, ARS, Riverside, CA, 1981.

van Genuchten, M. Th., Convective-dispersive transport of solutes involved in sequential first-order decay reactions, Computers & Geosciences, 11(2), 129-147, 1985.

van Genuchten, M. Th., J. Šimůnek, F. L. Leij, N. Toride, and M. Šejna, STANMOD: Model use, calibration and validation, special issue Standard/Engineering Procedures for Model Calibration and Validation, Transactions of the ASABE, 5(4), 1353-1366, 2012.

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