A comparison of three modeling procedures—CAL3QHCR, AERMOD area, and AERMOD volume—for predicting pollutant concentrations near highways is presented. All three use the Gaussian dispersion equations and are evaluated by contrasting the trends in model predictions. Model trends are depicted for a variety of conditions related to atmospheric stability, wind angle with respect to the highway, and near-road downwind distances. The tested models provided widely differing prediction trends. Predictions by the CAL3QHCR model at the roadway edge for crosswind conditions were independent of atmospheric stability; however, AERMOD predictions varied significantly by atmospheric stability. AERMOD produced the highest pollutant concentrations at roadside with an area source configuration and the lowest with a volume source configuration. AERMOD predicted a wider range of concentrations across unstable to stable atmospheric conditions compared with CAL3QHCR. The concentration decay predicted by AERMOD for convective conditions was virtually identical across a wide range of atmospheric scaling (Monin-Obukhov lengths of −6.9 to −8,888 m).
Comparing Predictions from the CAL3QHCR and AERMOD Models for Highway Applications
Transportation Research Record: Journal of the Transportation Research Board
Transportation Research Record: Journal of the Transportation Research Board ; 2428 , 1 ; 18-26
2014-01-01
Article (Journal)
Electronic Resource
English
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