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

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@article{02f82ae089d94dfda1e96cf8896f8268,
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.",
keywords = "Urban street canyon, Large-eddy simulation, Pollutant removal, Turbulence, Two-box model",
author = "Jian Zhong and Xiaoming Cai and William Bloss",
year = "2015",
month = may,
doi = "10.1016/j.envpol.2015.02.009",
language = "English",
volume = "200",
journal = "Environmental Pollution",
issn = "0269-7491",
publisher = "Elsevier",
number = "42-52",

}

RIS

TY - JOUR

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

VL - 200

JO - Environmental Pollution

JF - Environmental Pollution

SN - 0269-7491

IS - 42-52

ER -