Modelling air quality in street canyons: a review

被引:813
作者
Vardoulakis, S
Fisher, BEA
Pericleous, K
Gonzalez-Flesca, N
机构
[1] Univ Greenwich, Sch Comp & Math Sci, London SE10 9LS, England
[2] Environm Agcy, Natl Ctr Risk Anal & Opt Appraisal, Reading RG1 8DG, Berks, England
[3] INERIS, F-60550 Verneuil En Halatte, France
关键词
urban canyon; air pollution; traffic emissions; small-scale dispersion models;
D O I
10.1016/S1352-2310(02)00857-9
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
High pollution levels have been often observed in urban street canyons due to the increased traffic emissions and reduced natural ventilation. Microscale dispersion models with different levels of complexity may be used to assess urban air quality and support decision-making for pollution control strategies and traffic planning. Mathematical models calculate pollutant concentrations by solving either analytically a simplified set of parametric equations or numerically a set of differential equations that describe in detail wind flow and pollutant dispersion. Street canyon models, which might also include simplified photochemistry and particle deposition-resuspension algorithms, are often nested within larger-scale urban dispersion codes. Reduced-scale physical models in wind tunnels may also be used for investigating atmospheric processes within urban canyons and validating mathematical models. A range of monitoring techniques is used to measure pollutant concentrations in urban streets. Point measurement methods (continuous monitoring, passive and active pre-concentration sampling, grab sampling) are available for gaseous pollutants. A number of sampling techniques (mainly based on filtration and impaction) can be used to obtain mass concentration, size distribution and chemical composition of particles. A combination of different sampling/monitoring techniques is often adopted in experimental studies. Relatively simple mathematical models have usually been used in association with field measurements to obtain and interpret time series of pollutant concentrations at a limited number of receptor locations in street canyons. On the other hand, advanced numerical codes have often been applied in combination with wind tunnel and/or field data to simulate small-scale dispersion within the urban canopy. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:155 / 182
页数:28
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