APPLICATION OF GIS TO SIMULATION OF THE AIR TRAFFIC POLLUTION IN NAKHON RATCHASIMA, THAILAND

摘要

The purpose of the study is to generate traffic air pollution map using mathematical model and geographic information system (GIS). The pollutants analyzed were CO, and NOx which can be harmful to people living in the area. The 3 steps of mapping process were performed under the GIS environment using the existing vehicle emission rates and pollutant dispersion model. First, traffic volume, road network, and the emission rates of road segments varying with types of vehicle were collected from existing data. Second, the pollutant concentrations were calculated by use of Caline4, a tool with Gaussian dispersion model. The model parameters include emission rate, wind directions and speeds, ambient temperature and observed pollutant concentration, and atmospheric stability during all seasons from the 1st January 2010 to 31st May 2011. This resulted in concentrations at many receptor points along links of the road network. Third, distributions of pollution concentrations were generated by means of the spatial interpolation of those from receptors. The results can be used as helpful basic data for efficient traffic and transportation planning.