Spatial Mobile Source Pollution Distribution and Risk Analyses.
|關鍵字:||移動污染;風險評估;污染空間分佈;模式模擬;永續環境系統分析;mobile source pollution;risk assessment;spatial pollution distribution;modeling simulation;sustainable environmental systems analysis|
Vehicle exhaust emission is the main source of air pollution in metropolitan areas in Taiwan and greatly affects citizens and causes health risks. Different traffic flows, spatial mobile pollution distributions, and population distributions can cause different levels of impact and health risk. This study is thus initiated to develop appropriate methods for assessing the spatial impact and risk caused by the mobile pollution. Taipei City is the case study area for this research, and the proposed methods will be applied to evaluate its mobile pollution spatial impact and risk. It is not easy to evaluate the spatial distribution of the mobile pollution. Although a method called the Road Network Density (RND) method had been previously proposed, similar RNDs do not imply similar traffic flows and thus may subsequently underestimate the pollution in high traffic-flow areas, and the error may be quite significant. Therefore, the traffic flow is also analyzed for developing a method to resolve this problem. Furthermore, different traveling distances can cause different emissions, and thus the vehicle miles traveled are to be estimated for establishing another enhanced method. Before implementing these methods, the total mobile pollution (TMP) emission from the entire city is estimated according to the amount of gasoline consumed, based on the approach proposed by the RND method. The entire study areas are divided into numerous grids in the same size. The TMP emission is allocated to each grid according to its ratio determined by the RND and proposed methods. With the pollution distributions determined by the methods and the population distribution of the city, spatial impacts and health risks caused by mobile pollution are estimated. In addition, since similar emission in different types of roads can generate different distributions of mobile pollution, the Operational Street Pollution Model is adopted to simulate air pollutant concentrations on road sides, and the results obtained are to be used to assess the exposure risk on the residents living in the road sides. It is believed that the proposed methods can improve the estimation and assessment of spatial mobile pollution distribution and subsequently facilitate related decision-making analyses.
|Appears in Collections:||Research Plans|