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United States Department of Agriculture

Agricultural Research Service

CFITM Model
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Year: 1980
Version: 1.0

Abstract:

Predictions of solute transport in the field are generally based upon convective-dispersive type transport equations. The one-dimensional form of this equation contains two parameters which must be determined beforehand. They are the dispersion coefficient and a distribution coefficient, the latter acounting for adsorption or exchange between the liquid and solid phases. Both coefficients can be obtained by fitting an analytical solution of the one-dimensional convective-dispersive transport equation to observed column effluent data. CFITM describes a non-linear least-squares curve-fitting computer model which may be used for that purpose. The program considers analytical solutions of the convection-dispersion equation for both finite and semi-infinite porous media.

The code comes with a user manual giving detailed instructions for data input preparation. Sample input and output files are also provided.

Reference:

M. Th. van Genuchten. 1980. Determining Transport Parameters from Solute Displacement Experiments, Version 1.0. Research Report No. 118, U.S. Salinity Laboratory, USDA, ARS, Riverside, California.

Technical contact:
Todd Skaggs
USDA-ARS U.S. Salinity Laboratory
450 W Big Springs Road
Riverside, CA 92507-4617

Tel: 951-369-4853
Fax: 951-342-4964
Todd.Skaggs@ars.usda.gov


Last Modified: 5/1/2014