Development of numerical model for dispersion over complicated terrain in the convective boundary layer
by Akinori Kouchi, Kazuki Okabayashi, Hiroshi Yoshikado, Koji Kitabayashi, Shin'ichi Okamoto, Yuji Ohya, Yasuo Ide, Keizo Kobayashi
International Journal of Environment and Pollution (IJEP), Vol. 25, No. 1/2/3/4, 2005

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.

Online publication date: Wed, 31-Aug-2005

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