气候变化领域集成服务门户(CCPortal): Parameterizing the aerodynamic effect of trees in street canyons for the street network model MUNICH using the CFD model Code

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DOI	10.5194/acp-22-9369-2022
	Parameterizing the aerodynamic effect of trees in street canyons for the street network model MUNICH using the CFD model Code_Saturne
	Maison, Alice; Flageul, Cedric; Carissimo, Bertrand; Wang, Yunyi; Tuzet, Andree; Sartelet, Karine
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	9369
结束页码	9388
卷号	22 期号:14 页码:20
英文摘要	Trees provide many ecosystem services in cities such as urban heat island reduction, water runoff limitation, and carbon storage. However, the presence of trees in street canyons reduces the wind velocity in the street and limits pollutant dispersion. Thus, to obtain accurate simulations of pollutant concentrations, the aerodynamic effect of trees should be taken into account in air quality models at the street level. The Model of Urban Network of Intersecting Canyons and Highways (MUNICH) simulates the pollutant concentrations in a street network, considering dispersion and physico-chemical processes. It can be coupled to a regional-scale chemical transport model to simulate air quality over districts or cities. The aerodynamic effect of the tree crown is parameterized here through its impact on the average wind velocity in the street direction and the vertical transfer coefficient associated with the dispersion of a tracer. The parameterization is built using local-scale simulations performed with the computational fluid dynamics (CFDs) code Code_Saturne. The two-dimensional CFD simulations in an infinite street canyon are used to quantify the effect of trees, depending on the tree characteristics (leaf area index, crown volume fraction, and tree height to street height ratio) using a drag porosity approach. The tree crown slows down the flow and produces turbulent kinetic energy in the street, thus impacting the tracer dispersion. This effect increases with the leaf area index and the crown volume fraction of the trees, and the average horizontal velocity in the street is reduced by up to 68 %, while the vertical transfer coefficient by up to 23% in the simulations performed here. A parameterization of these effects on horizontal and vertical transfers for the street model MUNICH is proposed. Existing parameterizations in MUNICH are modified based on Code_Saturne simulations to account for both building and tree effects on vertical and horizontal transfers. The parameterization is built to obtain similar tree effects (quantified by a relative deviation between the cases without and with trees) between Code_Saturne and MUNICH. The vertical wind profile and mixing length depend on leaf area index, crown radius, and tree height to street height ratio. The interaction between the trees and the street aspect ratio is also considered.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000827462600001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273176
作者单位	Ecole des Ponts ParisTech; Electricite de France (EDF); AgroParisTech; INRAE; UDICE-French Research Universities; Universite Paris Saclay; Centre National de la Recherche Scientifique (CNRS); Ecole Nationale Superieure de Mecanique et d'Aerotechnique (ISAE-ENSMA); Universite de Poitiers
推荐引用方式 GB/T 7714	Maison, Alice,Flageul, Cedric,Carissimo, Bertrand,et al. Parameterizing the aerodynamic effect of trees in street canyons for the street network model MUNICH using the CFD model Code_Saturne[J],2022,22(14):20.
APA	Maison, Alice,Flageul, Cedric,Carissimo, Bertrand,Wang, Yunyi,Tuzet, Andree,&Sartelet, Karine.(2022).Parameterizing the aerodynamic effect of trees in street canyons for the street network model MUNICH using the CFD model Code_Saturne.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(14),20.
MLA	Maison, Alice,et al."Parameterizing the aerodynamic effect of trees in street canyons for the street network model MUNICH using the CFD model Code_Saturne".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.14(2022):20.