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A field-scale, unsaturated flow and solute ttansport experiment at the Las Cruces trench site in New Mexico was simulated as part of a "blind" modeling exercise to demonstrate the ability or inability of uncalibrated models to predict unsaturated flow and solute transport in spatially variable porous media. Simulations were conducted using a recently developed multiphase flow and ttansport simulator. Uniform and heterogeneous soil models were tested, and data Ill from a previous experiment at the site were used with an inverse procedure to estimate water retention parameters. A spatial moment analysis was used to provide a quantitative basis for comparing the mean observed and simulated flow and transport behavior. The results of this study suggest that defensible predictions of waste migration and fate at lowlevel waste sites will ultimately require site-specific data for model calibration.

Simulation of unsaturated flow and nonreactive solute transport in a heterogeneous soil at the field scale