Effects of inhomogeneous ground-level pollutant sources under different wind directions
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
Author(s)
Related Research Unit(s)
Detail(s)
Original language | English |
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Article number | 117903 |
Journal / Publication | Environmental Pollution |
Volume | 289 |
Online published | 4 Aug 2021 |
Publication status | Published - 15 Nov 2021 |
Link(s)
Abstract
Effects of source inhomogeneity on pollutant dispersion from a cubic building array are investigated as a function of the external wind direction. Using building-resolving large-eddy simulation, it is found that the results depend strongly on the source location and source uniformity inside a near-field region defined by a radius of homogenisation (RAD) based on the spatial autocorrelation of the pollutant concentration. The sensitivity of the RAD to the source location changes abruptly around 30° and is greatly reduced for wind angles between 30 and 45°, in agreement with velocity statistics and the mean horizontal streamlines. The optimal source allocation, which is a proxy for emissions from time-dependent traffic, also changes around 30°. This work clarifies the relationship between inhomogeneous velocity and pollutant statistics and may be applied to the formulation of traffic control policy.
Research Area(s)
- Air pollution, Large-eddy simulation, Pollutant dispersion, Radius of homogenisation, Traffic
Citation Format(s)
Effects of inhomogeneous ground-level pollutant sources under different wind directions. / Wang, Huanhuan; Ngan, Keith.
In: Environmental Pollution, Vol. 289, 117903, 15.11.2021.
In: Environmental Pollution, Vol. 289, 117903, 15.11.2021.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review