Analysis of local scale tree–atmosphere interaction on pollutant concentration in idealized street canyons and application to a real urban junction

Buccolieri, Riccardo; Salim, Salim Mohamed; Leo, Laura S.; Sabatino, Silvana Di; Chan, Andy; Ielpo, Pierina; Gennaro, Gianluigi de; Gromke, CB Christof

doi:10.1016/j.atmosenv.2010.12.058

Cited by 216 publications

(123 citation statements)

References 35 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%

“…flow and pollutant dispersion were investigated within an isolated canyon. Investigations of flow and pollutant dispersion on the scale of two intersecting streets or street canyons were addressed in CFD studies by (Buccolieri et al, 2011;Vos et al, 2013) and (Wania et al, 2012). They also found increases in traffic pollutant concentrations in the presence of avenue-trees.…”

Section: Introductionmentioning

confidence: 99%

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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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139

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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%

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

Self Cite

139

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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

162

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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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“…In recent years, environmental issues become increasingly prominent, and windbreak performance of the trees is drawing more and more attention and has been widely used in the field of wind resistance, 1 sand fixing, 2 local wind environment improvement, 3 and urban pollutants control. 4 When windbreak performance simulation of trees was carried by wind tunnel test, in addition to meeting the conditions of geometric similarity, some other indicators of the scale model such as the porosity, the equivalent hole hydraulic diameter, the local Reynolds, and so on also need to be controlled; Finding suitable materials for scaled tree model using in the wind tunnel tests has always been a difficulty of carrying out the study on windbreak performance of trees. In computational fluid dynamics (CFD), the obstruction of porous media to airflow can be simulated through correcting the momentum equation by introducing a specific momentum sink, and then the flow state after flowing through porous media can be obtained, this method is called additional source term method.…”

Section: Introductionmentioning

confidence: 99%

Study on windbreak performance of tree canopy by numerical simulation method

Zhang

Wang

2018

The Journal of Computational Multiphase Flows

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When airflow fly over trees, a shelter area will be generated at downstream area, and wind speed in the region will be reduced correspondingly. In order to analyze the windbreak performance of tree canopy, porous media method and additional source term are explored to simulate by computational fluid dynamics. Based on the given method, windbreak performance of trees with different canopy porosity, canopy shapes and distances between trees is investigated in detail, and characteristics of wind flow on the downstream of tree are shown. Results showed that small canopy porosity does not always mean good performance of windbreak, especially for the lower part. Canopy shapes only affect wind speed in the wake range. In these regions, windbreak performance of tree depends on the thickness of canopy. When distance is beyond 3H (H is the height of tree), wind speed becomes uniform at the downstream of tree and spacing can be equivalent to the porosity. But, for the region close to tree, trees with spacing cannot provide effective windshield. These simulations of tree canopy windbreak performance are conducted. All the results of the new model show better canopy flow characteristics through the field.

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Analysis of local scale tree–atmosphere interaction on pollutant concentration in idealized street canyons and application to a real urban junction

Cited by 216 publications

References 35 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

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

Study on windbreak performance of tree canopy by numerical simulation method

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