Concentration Fluctuations in Smoke Plumes Released Near the Ground |
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| Authors: | H E Jørgensen T Mikkelsen H L Pécseli |
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| Institution: | (1) Department of Environmental Technology Management, College for Women, Kuwait University, P.O. Box 5969, Kuwait, Safat, 13060, State of Kuwait;(2) Faculty of Engineering, Assiut University, Assiut, 71516, Egypt |
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| Abstract: | Near-ground artificial cloud releases in the turbulent atmospheric boundary layer were investigated experimentally by Lidar
measurement techniques. Simple scaling relations between the average concentration and the lowest order moments are suggested
by simple analytical models, and the experimental results are tested against these hypotheses. We find strong evidence for
a simple scaling of the standard deviation, skewness and kurtosis with the average concentrations at the downwind distances
observed in our experiments. Near-ground concentration fluctuations in fixed as well as moving frames of references are investigated.
The scaling is supported by data from several experimental sites and different atmospheric stability conditions. One conclusion
of the study is that relatively accurate estimates for the standard deviation, skewness and kurtosis can be obtained for the
concentration fluctuations, given a reliable estimate of the space-time varying average concentration field. |
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