Study On Effects Of Fluctuations In The Wind Direction On Pollutant Diffusion
In Urban Areas
Author(s)
M.F. Yassin, S. Kato, R. Ooka, T. Takahashi & R. Kouno
Abstract
Study on effects of fluctuations in the wind
direction on pollutant diffusion in urban areas
M.F. Yassin, S. Kato, R. Ooka, T. Takahashi & R. Kouno
Institute of Industrial Science, University of Tokyo, Japan
Abstract
The effect of varying wind directions on pollutant diffision from a point source
in an urban area have been studied in a wind tunnel experiment, using tracer gas
techniques. Most experiments were conducted under neutral conditions of the
atmospheric boundary layer. Some cases were investigated in stable and unstable
conditions. Diffusion fields on a city model of Hamamatsucho in Tokyo, Japan
were simulated in a turbulent boundary layer wind tunnel. The scale of the model
was taken as 1:600. Ethylene, C2H,, was used as the tracer gas. A total of
nineteen wind directions from west-northwest 292.5' to north- northwest 337.5'
were investigated at eighty-three sampling point? located on the model during
the diffusion experiments. Flow characteristics were studied by local changes in
the
Keywords
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