A comparison of concentration estimates by the OMG VOLUME-SOURCE dispersion model with three line source dispersion models |
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| Institution: | 1. Planning and Coordination Department, Environment Division, Environment and Public Health Bureau of Osaka City, 1-3-20, Nakanoshima, Kita-ku, Osaka, 543 Japan;2. College of Engineering, University of Osaka Prefecture, Mozu-Umemachi, Sakai, Osaka, 591 Japan;1. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China;2. College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China;3. Institute of Surface-Earth System Science, Tianjin University, Tianjin, 300072, China;4. Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China;1. School of Earth and Environmental Sciences, Seoul National University, Seoul 151-742, Republic of Korea;2. Department of Civil and Environmental Engineering, Princeton University, NJ 08544, USA;3. Department of Atmospheric Science, Kongju National University, Gongju 314-701, Republic of Korea;1. Oak Ridge Institute for Science and Education, Oak Ridge, TN, 37830, USA;2. U.S. Environmental Protection Agency (EPA), Office of Research and Development, Research Triangle Park, NC, 27711, USA;3. Shelby County Health Department, Memphis, TN, 38105, USA;4. U.S. EPA Region 4, Atlanta, GA, 30303, USA;5. U.S. EPA Region 7, Lenexa, KS, 66219, USA;6. U.S. EPA Region 6, Dallas, TX, 75202, USA;7. U.S. EPA, Office of Land and Emergency Management, Edison, NJ, 08837, USA;8. General Dynamics Information Technology, Edison, NJ, 08837, USA;1. Department of Environmental Health Sciences, School of Public Health, University of Michigan, 1420 Washington Heights, Ann Arbor, MI 48109, USA;2. Health Effects, Benefits, and Air Toxics Center, Assessment and Standards Division, Office of Transportation and Air Quality, U. S. Environmental Protection Agency, Ann Arbor, MI, USA;3. College of Engineering, University of Michigan, Ann Arbor, MI, USA |
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| Abstract: | A comparison is presented between observed SF6 concentrations and values estimated using the OMG VOLUME-SOURCE model and three line source dispersion models; JEA (Japan Environmental Agency) model, TOKYO model and EPA HIWAY-2 model. SF6 concentration values were measured at heights from 1 to 20 m at from 7 to 192 m from roadways in three major urban areas: Osaka, Nagoya and Kobe. It is concluded from the comparison statistics that, of the dispersion models tested, the OMG VOLUME-SOURCE model provides the most precise and accurate representation of the actual gas dispersion.A comparison was made of the depth of the volume source and the initial vertical spread as used in Gaussian plume line source models. The initial vertical spread was found to be 0.8–1 times as large as the thickness of the volume source. |
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