globalchange  > 气候变化与战略
DOI: 10.1016/j.atmosenv.2020.117518
论文题名:
Level-crossing statistics of a passive scalar dispersed in a neutral boundary layer
作者: Bertagni M.B.; Marro M.; Salizzoni P.; Camporeale C.
刊名: Atmospheric Environment
ISSN: 1352-2310
出版年: 2020
卷: 230
语种: 英语
学科: Analytical relationships ; Crossing rates ; Crossing times ; Gamma distribution ; Turbulent dispersion
中文摘要: 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
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160359
Appears in Collections:气候变化与战略

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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

Recommended Citation:
Bertagni M.B.,Marro M.,Salizzoni P.,et al. Level-crossing statistics of a passive scalar dispersed in a neutral boundary layer[J]. Atmospheric Environment,2020-01-01,230
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