Local and non-local effects of building arrangements on pollutant fluxes within the urban canopy
Local and non-local effects of building arrangements on pollutant fluxes within the urban canopy
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DOI：
10.1016/j.buildenv.2018.09.023
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发表时间：
2019-01
影响因子：
7.4
通讯作者：
E. Goulart;N. C. Reis;V. F. Lavor;I. Castro;J. M. Santos;Zheng-Tong Xie
中科院分区：
文献类型：
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作者：
E. Goulart;N. C. Reis;V. F. Lavor;I. Castro;J. M. Santos;Zheng-Tong Xie
这项工作调查了位于代表城市环境的区块阵列中的面源排放的污染物的垂直和水平质量(标量)通量。测试了由随机和均匀高度的建筑物以及交错排列的建筑物组成的阵列。结果表明，源附近的垂直标量通量会影响到下风向清洁区。结果还表明，较高的建筑物增加了垂直标量通量和较小建筑物上方的垂直速度的波动。垂直平流标量通量对建筑物附近的扩散有影响(局部效应)，而垂直湍流通量与较小建筑物上方的污染物下风向输送有关(非局部效应)。
This work investigates the vertical and horizontal mass (scalar) flux of a contaminant emitted from an area source located in an array of blocks representing an urban environment. Arrays consisting of buildings with random and uniform heights and staggered and aligned arrangements were tested. Results shows that the vertical scalar flux close to the source can affect downwind clean zones. It is also shown that taller buildings increase the vertical scalar flux and the fluctuations of the vertical velocity above the smaller buildings. The vertical advective scalar flux was found to have an effect on dispersion in the vicinity of the building (a local effect), while the vertical turbulent fluxes are associated with pollutant transportation downwind above the smaller buildings (a non-local effect).