A description of the California line source dispersion model, CALINE4, is given, along with a brief history of the model's development. CALINE4 is based on the gaussian plume methodology and is used to predict air pollutant concentration near roadways. Predictions can be made for carbon monoxide, nitrogen dioxide, and suspended particulates. An option for modelling air quality near intersections is described. CALINE4 represents an updated and expanded version of CALINE3. The newer model can handle a greater variety of problems and has improved input/output flexibility. Estimates of vertical and horizontal dispersion are enhanced by accounting for vehicle-induced thermal turbulence and wind direction variability. CALINE4 is verified by using results from five separate field studies. Comparisons to CALINE3 indicate modest improvements in the accuracy of the newer version.
Samenvatting