The Study of Meteorological Parameters with regard to Atmospheric Diffusion in Light-wind. Part (II)
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概要
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Considering the air pollution and atmospheric diffusion in the surface layer under light wind conditions, the horizonal directional fluctuation which is closely connected with the width of plume was taken up as meteorological parameter.<BR>First, both the shape of probability density distribution and the relation to sampling duration have been investigated.<BR>Next, in order to trace the time variation of wind flow from time to time, progressive diagram is drawn up.<BR>Main results clarified by the present observation are summarized as follows.<BR>(1) At higher wind speed, the probability density distribution (P. D. D.) of horizontal directional fluctuation resembles Gaussian distribution in shape as indicated previously but in light wind (U<1 m/s), P. D. D. shifts far away from Gaussian distribution and has few steep peaks.<BR>(2) Skewness and flatness factor (or kurtosis), which gives a measure of the P. D. D., tends to take a nearly Gaussian's value as mean wind U increases.<BR>(3) It seems in the present analytical results that P. D. D. in from 5 to 10 minutes (as sampling duration) fits comparatively Gaussian distribution for 40 minutes measurements.<BR>(4) It is found from progressive diagram in light wind that the variation of wind flow is complex, namely meandering, stagnant and discribes an arc.
- 社団法人 大気環境学会の論文
社団法人 大気環境学会 | 論文
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