Title: Development of numerical model for dispersion over complicated terrain in the convective boundary layer

Authors: Akinori Kouchi, Kazuki Okabayashi, Hiroshi Yoshikado, Koji Kitabayashi, Shin'ichi Okamoto, Yuji Ohya, Yasuo Ide, Keizo Kobayashi

Addresses: Nagasaki R&D Center, Mitsubishi Heavy Industries, Ltd., 5–717–1, Fukahori-machi, Nagasaki, 851–0392 Nagasaki, Japan. ' Nagasaki R&D Center, Mitsubishi Heavy Industries, Ltd., 5–717–1, Fukahori-machi, Nagasaki, 851–0392 Nagasaki, Japan. ' National Institute of Advanced Industrial Science and Technology, 16–3, Onogawa, Tsukuba 305–8569, Japan. ' Kogakuin University, 1–24–2, Nishi-shinjuku, Shinjuku-ku, Tokyo, 163–8677, Japan ' Tokyo University of Information Science, 1200–2, Yatoh-cho, Wakaba-ku, Chiba, 265–8501, Japan. ' Research Institute for Applied Mechanics, Kyusyu University, 6–1, Kasuga-kouen, Kasuga, 816–8580, Japan. ' Kurume Institute of Technology, 2228–66, Kamitsu, Kurume, Fukuoka, 830–0052, Japan. ' Japan Environmental Management Association for Industry, 2–2–1, Kaji-machi, Chiyoda-ku, Tokyo, 101–0044, Japan

Abstract: Complicated terrain and atmospheric stability are important factors in the predicting the dispersion of air pollutants. The aim of our study is to develop practical dispersion model for unstable conditions for regulatory use. The numerical model we adopted was a combination of the potential flow model and Lagrangian stochastic dispersion model. In this model, time-mean flow field is solved by the potential flow model and concentration field is calculated by Lagrangian stochastic model by using the flow field from potential model. Wind tunnel experiments simulating gas dispersion in the convective boundary layer were also done. The data sets of turbulent properties and concentrations obtained in the wind tunnel were used for the modification of dispersion model and model validation. Based on the developed model, user-friendly software applicable to dispersion over complicated terrain was also developed.

Keywords: atmospheric dispersion modelling; convective boundary layer; complicated terrain; Lagrangian stochastic model; potential flow model; air pollution; air quality; regulatory use; simulation; atmospheric stability; unstable conditions.

DOI: 10.1504/IJEP.2005.007654

International Journal of Environment and Pollution, 2005 Vol.25 No.1/2/3/4, pp.48 - 59

Published online: 31 Aug 2005 *

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