Aerodynamic effects of trees on pollutant concentration in street canyons

Buccolieri, Riccardo; Gromke, CB Christof; Sabatino, Silvana Di; Ruck, Β.

doi:10.1016/j.scitotenv.2009.06.016

Cited by 244 publications

(126 citation statements)

References 29 publications

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“…Balczo et al, 2009;Buccolieri et al, 2011Buccolieri et al, , 2009Gromke and Ruck, 2012Gromke, 2011;Gromke et al, 2008;Li et al, 2013;Moonen et al, 2013;Salim et al, 2011;Vos et al, 2013;Wania et al, 2012), qualitative and not only quantitative changes in the flow field were observed at the neighborhood scale. The qualitative changes indicate on the one side the necessity to perform studies at the urban neighborhood rather than at the street canyon scale and on the other side to account for avenue-trees, or more general all types of vegetation typical for built-up environments, in microscale urban air quality studies.…”

Section: Discussionmentioning

confidence: 91%

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Influence of avenue-trees on air quality at the urban neighborhood scale. Part II: Traffic pollutant concentrations at pedestrian level

Gromke

Blocken

2015

Environmental Pollution

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120

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a b s t r a c tFlow and dispersion of traffic-emitted pollutants were studied in a generic urban neighborhood for various avenue-tree layouts by employing 3D steady RANS simulations with the realizable k-ε turbulence model. In comparison to the tree-free situation quantitative and qualitative changes with flow reversal in the wind field were observed. Low to moderate increases (<13.2%) in the neighborhood-averaged pollutant concentration were found at pedestrian level. An approximately 1% increase in the neighborhood-averaged concentration was obtained with each percent of the street canyon volumes being occupied by vegetation for occupation fractions between 4 and 14%. The overall pattern of concentration changes relative to the tree-free situation was similar for all avenue-tree layouts. However, pronounced locally restricted decreases or increases in concentration (À87 to þ1378%) occurred. The results indicate the necessity to account for existing or planned avenue-trees in neighborhood scale dispersion studies. Their consideration is prerequisite for reliable urban air quality assessment.

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Section: Discussionmentioning

confidence: 91%

“…(Balczo et al, 2009;Buccolieri et al, 2009;Gromke and Ruck, 2012Gromke, 2011;Gromke et al, 2008;Li et al, 2013;Moonen et al, 2013;Salim et al, 2011). The reason for this is the flow resistance of tree crowns which slows down the wind and reduces the air exchange between the street canyon and surrounding.…”

Section: Introductionmentioning

confidence: 99%

Influence of avenue-trees on air quality at the urban neighborhood scale. Part II: Traffic pollutant concentrations at pedestrian level

Gromke

Blocken

2015

Environmental Pollution

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120

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“…The reduction of near-road air pollution by roadside barriers, such as solid noise barriers and tree stands, has been studied. Tree stands, including street trees, have been identified as an effective means for reducing air pollutants and providing aesthetic improvement in urban landscapes [35,36]. Roadside tree canopies may adjust air quality through changing air dispersion as well as by capturing air pollutants.…”

Section: Introductionmentioning

confidence: 99%

The Concentrations and Reduction of Airborne Particulate Matter (PM10, PM2.5, PM1) at Shelterbelt Site in Beijing

Chen

Sun

et al. 2015

Atmosphere

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Particulate matter is a serious source of air pollution in urban areas, where it exerts adverse effects on human health. This article focuses on the study of subduction of shelterbelts for atmospheric particulates. The results suggest that (1) the PM mass concentration is higher in the morning or both morning and noon inside the shelterbelts and lower mass concentrations at other times; (2) the particle mass concentration inside shelterbelt is higher than outside; (3) the particle interception efficiency of the two forest belts over the three months in descending order was PM10 > PM1 > PM2.5; and (4) the two shelterbelts captured air pollutants at rates of 1496.285 and 909.075 kg/month and the major atmospheric pollutant in Beijing city is PM10. Future research directions are to study PM mass concentration variation of shelterbelt with different tree species and different configuration.

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“…Vegetation type, height, and thickness can all influence the extent of mixing and pollutant deposition experienced at the site. The built environment also matters greatly -air flow and impacts of trees are substantially different for a street canyon environment than an open highway environment (Buccolieri et al, 2009(Buccolieri et al, , 2011Gromke et al, 2008). Uncertainty remains concerning the degree to which vegetation reduces (or increases) pollutant concentrations in the near-road environment under varying meteorological conditions and vegetation characteristics.…”

Section: Introductionmentioning

confidence: 99%

Field assessment of the effects of roadside vegetation on near-road black carbon and particulate matter

Brantley

Hagler

Deshmukh

et al. 2014

Science of The Total Environment

153

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• Vegetation barriers altered near-road black carbon concentrations.• Vegetation reduced downwind black carbon concentrations by approximately 12%.• Downwind fine and coarse particle concentration were unaffected by vegetation.• Black carbon gradients more gradual behind vegetation compared to a clearing. a b s t r a c t a r t i c l e i n f o One proposed method for reducing exposure to mobile source air pollution is the construction or preservation of vegetation barriers between major roads and nearby populations. This study combined stationary and mobile monitoring approaches to determine the effects of an existing, mixed-species tree stand on near-road black carbon (BC) and particulate matter concentrations. Results indicated that wind direction and time of day significantly affected pollutant concentrations behind the tree stand. Continuous sampling revealed reductions in BC behind the barrier, relative to a clearing, during downwind (12.4% lower) and parallel (7.8% lower) wind conditions, with maximum reductions of 22% during the late afternoon when winds were from the road. Particle counts in the fine and coarse particle size range (0.5-10 μm aerodynamic diameter) did not show change. Mobile sampling revealed BC concentration attenuation, a result of the natural dilution and mixing that occur with transport from the road, was more gradual behind the vegetation barrier than in unobstructed areas. These findings suggest that a mature tree stand can modestly improve traffic-related air pollution in areas located adjacent to the road; however, the configuration of the tree stand can influence the likelihood and extent of pollutant reductions.Published by Elsevier B.V.

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Aerodynamic effects of trees on pollutant concentration in street canyons

Cited by 244 publications

References 29 publications

Influence of avenue-trees on air quality at the urban neighborhood scale. Part II: Traffic pollutant concentrations at pedestrian level

Influence of avenue-trees on air quality at the urban neighborhood scale. Part II: Traffic pollutant concentrations at pedestrian level

The Concentrations and Reduction of Airborne Particulate Matter (PM10, PM2.5, PM1) at Shelterbelt Site in Beijing

Field assessment of the effects of roadside vegetation on near-road black carbon and particulate matter

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