NDLI: Large eddy simulation of flow in a street canyon with tree planting under various atmospheric instability conditions

Content Provider	Springer Nature Link
Author	Gu, ZhaoLin Zhang, YunWei Lei, KangBin
Copyright Year	2010
Abstract	In this work, a large eddy simulation (LES) model, which includes momentum and heat source (or sink) inside the tree planting layer, is proposed for the simulation of flow in a street canyon with tree planting. Vegetation canopy layer simulation shows that this model can be used to simulate the velocity distribution and temperature variation inside the canopy layer. Effects of atmospheric instability on flow and pollutant distribution in a street canyon with tree planting of an aspect ratio of 0.5 are studied. Results show that compared with the canyon with no tree planting (or the exposed street canyon), the canyon with tree planting shows a reduced wind circulation and pollutant exchange rate (PER) at the top layer of the street canyon, which induces the increase in the pollutant concentrations near road surface, leeward wall and windward wall. When street canyon atmosphere is under a strongly unstable condition, wind velocity decreases while pollutant concentration is increased in the areas near the street canyon top, road surface, leeward and windward walls, compared with the wind velocity in the street canyon with the neutral stratification. When street canyon atmosphere is under a weakly unstable condition, wind velocity weakens near the street canyon top and windward wall, but strengthens near the road surface and leeward wall, and pollutant concentration is decreased near the leeward and windward walls and is increased between the two rows of trees. When the street canyon atmosphere is under an unstable condition, PER is lower than that under the neutral stratification.
Starting Page	1928
Ending Page	1937
Page Count	10
File Format	PDF
ISSN	16747321
Journal	Science in China Series E: Technological Sciences
Volume Number	53
Issue Number	7
e-ISSN	1862281X
Language	English
Publisher	SP Science China Press
Publisher Date	2010-07-06
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	street canyon flow tree planting atmospheric instability large eddy simulation pollutant concentration distribution Engineering
Content Type	Text
Resource Type	Article
Subject	Engineering Materials Science

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