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United States Department of Agriculture

Agricultural Research Service

Title: Mim Simulation of Cl and B Transport: Comparison with Measured Data from An Irrigated Field

item Vaughan, Peter
item Shouse, Peter
item Suarez, Donald
item Suarez, Donald

Submitted to: American Geophysical Union
Publication Type: Abstract Only
Publication Acceptance Date: September 3, 2003
Publication Date: December 7, 2003
Citation: Vaughan, P.J., Shouse, P.J., Suarez, D.L. 2003. Mim simulation of Cl- and B transport: Comparison with measured data from an irrigated field. American Geophysical Union. Paper No. H11G-0921.

Technical Abstract: The mobile-immobile water (MIM) model of solute transport can provide an improved representation of solute transport in soils especially for intact soil samples or field soils. The Unsatchem model of multicomponent solute transport was upgraded to include the MIM model. A field-based test of the MIM model consisted of running Unsatchem for 6 depths (0-1.8 m) at 45 locations within a 65 ha field in the San Joaquin Valley. Soil sampling was done at all locations at five different sampling periods starting in November, 1995 and ending in November, 1997. Chloride transport was calculated for both standard uniform flow (UFM) and MIM models. The MIM model parameters, omega, the transfer coefficient, and thetaim, the immobile water content, were varied systematically to determine their influence on the match between the model results and measured resident chloride concentrations. The MIM model performed better than UFM with the best match occurring for the highest thetaim and 10^-4<=omega<=10^-3.

Last Modified: 4/22/2015
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