The effects of roadside structures on the transport and dispersion of ultrafine particles from highways |
| |
| Institution: | 1. US Environmental Protection Agency, Office of Research and Development, National Exposure Research Laboratory, Atmospheric Modeling Division, USA;2. US Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, USA;3. US Environmental Protection Agency, Office of Air and Radiation, Office of Transportation and Air Quality, USA;4. NOAA/Atmospheric Sciences Modeling Division (In Partnership with the US Environmental Protection Agency), USA;5. Department of Civil and Environmental Engineering, Pratt School of Engineering, Duke University, USA;6. William Petersen, Consultants, Hurdle Mills, NC, USA;1. Department of Civil and Environmental Engineering, Faculty of Engineering and Physical Sciences (FEPS), University of Surrey, Guildford GU2 7XH, United Kingdom;2. Environmental Flow (EnFlo) Research Centre, FEPS, University of Surrey, Guildford GU2 7XH, United Kingdom;1. U.S. Environmental Protection Agency, Office of Research and Development, National Exposure Research Laboratory, Atmospheric Modeling and Analysis Division, Research Triangle Park, NC 27711, USA;2. University of California, Riverside, CA 92521, USA;3. William B. Petersen Consulting, Research Triangle Park, NC, USA;1. School of Environment, Natural Resources & Geography, Bangor University, United Kingdom;2. U.S. Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Research Triangle Park, NC 27711, USA;3. Georgia State University, School of Public Health, P.O. Box 3995, Atlanta, GA 30302-3995, USA;4. Department of Civil and Environmental Engineering, Faculty of Engineering and Physical Sciences (FEPS), University of Surrey, Guildford GU2 7XH, Surrey, United Kingdom;5. Environmental Flow Research Centre, FEPS, University of Surrey, Guildford GU2 7XH, Surrey, United Kingdom;6. Department of Civil, Structural & Environmental Engineering, Trinity College Dublin, Ireland |
| |
| Abstract: | Understanding local-scale transport and dispersion of pollutants emitted from traffic sources is important for urban planning and air quality assessments. Predicting pollutant concentration patterns in complex environments depends on accurate representations of local features (e.g., noise barriers, trees, buildings) affecting near-field air flows. This study examined the effects of roadside barriers on the flow patterns and dispersion of pollutants from a high-traffic highway in Raleigh, North Carolina, USA. The effects of the structures were analyzed using the Quick Urban & Industrial Complex (QUIC) model, an empirically based diagnostic tool which simulates fine-scale wind field and dispersion patterns around obstacles. Model simulations were compared with the spatial distributions of ultrafine particles (UFP) from vehicular emissions measured using a passenger van equipped with a Differential Mobility Analyzer/Condensation Particle Counter. The field site allowed for an evaluation of pollutant concentrations in open terrain, with a noise barrier present near the road, and with a noise barrier and vegetation present near the road.Results indicated that air pollutant concentrations near the road were generally higher in open terrain situations with no barriers present; however, concentrations for this case decreased faster with distance than when roadside barriers were present. The presence of a noise barrier and vegetation resulted in the lowest downwind pollutant concentrations, indicating that the plume under this condition was relatively uniform and vertically well-mixed. Comparison of the QUIC model with the mobile UFP measurements indicated that QUIC reasonably represented pollutant transport and dispersion for each of the study configurations. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
