Modelling the dispersion and transport of reactive pollutants in a deep urban street canyon: using large-eddy simulation

Jian Zhong; Xiaoming Cai; William Bloss

doi:10.1016/j.envpol.2015.02.009

Modelling the dispersion and transport of reactive pollutants in a deep urban street canyon: using large-eddy simulation

Jian Zhong, Xiaoming Cai, William Bloss

Research output: Contribution to journal › Article › peer-review

47 Citations (Scopus)

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Abstract

This study investigates the dispersion and transport of reactive pollutants in a deep urban street canyon with an aspect ratio of 2 under neutral meteorological conditions using large-eddy simulation. The spatial variation of pollutants is significant due to the existence of two unsteady vortices. The deviation of species abundance from chemical equilibrium for the upper vortex is greater than that for the lower vortex. The interplay of dynamics and chemistry is investigated using two metrics: the photostationary state defect, and the inferred ozone production rate. The latter is found to be negative at all locations within the canyon, pointing to a systematic negative offset to ozone production rates inferred by analogous approaches in environments with incomplete mixing of emissions. This study demonstrates an approach to quantify parameters for a simplified two-box model, which could support traffic management and urban planning strategies and personal exposure assessment.

Original language	English
Journal	Environmental Pollution
Volume	200
Issue number	42-52
Early online date	19 Feb 2015
DOIs	https://doi.org/10.1016/j.envpol.2015.02.009
Publication status	Published - May 2015

Keywords

Urban street canyon
Large-eddy simulation
Pollutant removal
Turbulence
Two-box model

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.envpol.2015.02.009

Zhong_et_al_Modelling_Dispersion_Transport_Environmental_Pollution_2015
NOTICE: this is the author’s version of a work that was accepted for publication in Environmental Pollution. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Environmental Pollution, Vol 200, May 2015, DOI: 10.1016/j.envpol.2015.02.009 Eligibility for repository checked May 2015
Accepted author manuscript, 1.7 MBLicence: Other (please specify with Rights Statement)

47 Citations
1 Conference contribution

Modelling the dispersion and transport of reactive pollutants in a deep urban street canyon using large-eddy simulation
Zhong, J., Cai, X. & Bloss, W., 12 Jun 2014, Urban Environmental Pollution, 12-15 June 2014, Toronto, Canada.
Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Cite this

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title = "Modelling the dispersion and transport of reactive pollutants in a deep urban street canyon: using large-eddy simulation",

abstract = "This study investigates the dispersion and transport of reactive pollutants in a deep urban street canyon with an aspect ratio of 2 under neutral meteorological conditions using large-eddy simulation. The spatial variation of pollutants is significant due to the existence of two unsteady vortices. The deviation of species abundance from chemical equilibrium for the upper vortex is greater than that for the lower vortex. The interplay of dynamics and chemistry is investigated using two metrics: the photostationary state defect, and the inferred ozone production rate. The latter is found to be negative at all locations within the canyon, pointing to a systematic negative offset to ozone production rates inferred by analogous approaches in environments with incomplete mixing of emissions. This study demonstrates an approach to quantify parameters for a simplified two-box model, which could support traffic management and urban planning strategies and personal exposure assessment.",

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T1 - Modelling the dispersion and transport of reactive pollutants in a deep urban street canyon

T2 - using large-eddy simulation

AU - Zhong, Jian

AU - Cai, Xiaoming

AU - Bloss, William

PY - 2015/5

Y1 - 2015/5

N2 - This study investigates the dispersion and transport of reactive pollutants in a deep urban street canyon with an aspect ratio of 2 under neutral meteorological conditions using large-eddy simulation. The spatial variation of pollutants is significant due to the existence of two unsteady vortices. The deviation of species abundance from chemical equilibrium for the upper vortex is greater than that for the lower vortex. The interplay of dynamics and chemistry is investigated using two metrics: the photostationary state defect, and the inferred ozone production rate. The latter is found to be negative at all locations within the canyon, pointing to a systematic negative offset to ozone production rates inferred by analogous approaches in environments with incomplete mixing of emissions. This study demonstrates an approach to quantify parameters for a simplified two-box model, which could support traffic management and urban planning strategies and personal exposure assessment.

AB - This study investigates the dispersion and transport of reactive pollutants in a deep urban street canyon with an aspect ratio of 2 under neutral meteorological conditions using large-eddy simulation. The spatial variation of pollutants is significant due to the existence of two unsteady vortices. The deviation of species abundance from chemical equilibrium for the upper vortex is greater than that for the lower vortex. The interplay of dynamics and chemistry is investigated using two metrics: the photostationary state defect, and the inferred ozone production rate. The latter is found to be negative at all locations within the canyon, pointing to a systematic negative offset to ozone production rates inferred by analogous approaches in environments with incomplete mixing of emissions. This study demonstrates an approach to quantify parameters for a simplified two-box model, which could support traffic management and urban planning strategies and personal exposure assessment.

KW - Urban street canyon

KW - Large-eddy simulation

KW - Pollutant removal

KW - Turbulence

KW - Two-box model

U2 - 10.1016/j.envpol.2015.02.009

DO - 10.1016/j.envpol.2015.02.009

M3 - Article

SN - 0269-7491

VL - 200

JO - Environmental Pollution

JF - Environmental Pollution

IS - 42-52

ER -

Modelling the dispersion and transport of reactive pollutants in a deep urban street canyon: using large-eddy simulation

Abstract

Keywords

UN SDGs

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Research output

Modelling the dispersion and transport of reactive pollutants in a deep urban street canyon using large-eddy simulation

Cite this