Configuration Strategy of Air Dispersion Modelfor Transportation Environmental Impact Assessment

Abstract:

Because the modeling process using air dispersion model （AERMOD） for transportation environmental impact assessment has a high potential for analysis error， it is necessary to examine the differences between area and volume source and contrast the low-resolution receptor placement with high-resolution receptor placement. The mechanism of exclusion zones in volume source is analyzed and a method for avoiding the negative effects of exclusion zones is proposed. The results indicate that it is easy to create analysis errors using the volume source， which is largely caused by the effects of the exclusion zones. It is also found that higher densities of receptors better capture the characteristics of concentrations， especially at the locations near the emission source.

Key words:urban traffic;traffic environment;air dispersion model;configuration strategy;error control