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DOI	10.1016/j.atmosenv.2020.117518
	Level-crossing statistics of a passive scalar dispersed in a neutral boundary layer
	Bertagni M.B.; Marro M.; Salizzoni P.; Camporeale C.
发表日期	2020
ISSN	1352-2310
卷号	230
英文摘要	The concentration of a passive scalar dispersed in a turbulent flow exhibits a complex stochastic dynamics. In this paper, we present a minimalist stochastic model that resembles the concentration statistics of a passive scalar emitted from a localized source in a neutral boundary layer. The model provides closed forms for the crossing rates and times — the mean frequency of exceeding a certain concentration level and the mean time above it. Three concentration statistics are needed as model inputs: the mean, the standard deviation, and the integral scale. By giving analytical relationships also for these statistics, we provide a completely closed methodology that may serve as a rapid and practical tool to estimate the dynamics of a pollutant dispersed in the atmosphere. Results are validated against wind-tunnel measurements. © 2020 Elsevier Ltd
英文关键词	Analytical relationships; Crossing rates; Crossing times; Gamma distribution; Turbulent dispersion
语种	英语
来源期刊	Atmospheric Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129522
作者单位	Department of Land, Infrastructure and Environmental Engineering, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino, 10124, Italy; Laboratoire de Mécanique des Fluides et d'Acoustique, University of Lyon, CNRS UMR 5509 Ecole Centrale de Lyon, INSA Lyon, Université Claude Bernard, 36, avenue Guy de Collongue, Ecully, 69134, France
推荐引用方式 GB/T 7714	Bertagni M.B.,Marro M.,Salizzoni P.,et al. Level-crossing statistics of a passive scalar dispersed in a neutral boundary layer[J],2020,230.
APA	Bertagni M.B.,Marro M.,Salizzoni P.,&Camporeale C..(2020).Level-crossing statistics of a passive scalar dispersed in a neutral boundary layer.Atmospheric Environment,230.
MLA	Bertagni M.B.,et al."Level-crossing statistics of a passive scalar dispersed in a neutral boundary layer".Atmospheric Environment 230(2020).