FIELD TESTING AND COMPARISON OF THE PRZM AND GLEAMS MODELS

Abstract

ABSTRACT The root/vadose zone transport models PRZM and GLEAMS were tested against an experimental data set. Parameters were not optimized or calibrated to produce the best fit. In all cases the measured and predicted peak concentrations agreed within an order of magnitude, and in most cases agreed within a factor of 2 to 3. This level of agreement between the models and the measured data is within the criteria for model acceptance suggested by the EPA. The small differences noted in simulated transport between the models are thought to be a result of differences in computational layering and chemical transport calculation methods.