An Analytical Model For Threshold Crossing Rates Of Concentration Fluctuations In Dispersing Plumes |
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Authors: | Eugene Yee |
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Institution: | (1) Defence Research Establishment Suffield, Box 4000, Medicine Hat, Alberta, T1A 8K6, Canada |
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Abstract: | A simple analytical model is developed for the meanupcrossing rate of plume concentration fluctuations assuming that thisprocess can be well approximated by a lognormal process. The resultingexpression requires only the specification of the in-plume fluctuationintensity and in-plume Taylor micro-time scale and, hence, does notexplicitly involve the joint probability density function of theconcentration and its derivative. The analytical model provides agood fit to some field measurements of the mean upcrossing rate ina dispersing plume. |
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Keywords: | Concentration fluctuations Level-crossing statistics |
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