A CFD Study of Roadside Barrier Impact on the Dispersion of Road Air Pollution

Jeong, Sang Jin

doi:10.5572/ajae.2015.9.1.022

Cited by 10 publications

(9 citation statements)

References 16 publications

(21 reference statements)

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“…In the literature on near-road air pollution impact, the velocity field is generally only resolved from local atmospheric conditions. With very few exceptions [43,44], the modeling of pollutant dispersion and deposition does not include velocity momentum and turbulence generated mechanically by the traffic whether for verisimilar urban environments [45] or for different roadside barrier configurations [11,46,47] or for true road networks [48]. In the present case, it would be a rough approximation to exclude the traffic input on the mean velocity field and on turbulence for two reasons.…”

Section: Assessment Of the Velocity Field Umentioning

confidence: 99%

“…Earth berms are structures mainly built for noise abatement strategy [10]. Their impact on air pollution lessening is seldom studied [11] in contrast to that of alternative structures such as solid or vegetative noise barriers, e.g., [12][13][14][15][16][17]. The population expectations on the air quality issue coincide with effective ways and means of evaluating the efficiency of this local noise barrier setup.…”

Section: Introductionmentioning

confidence: 99%

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Biomagnetic Monitoring vs. CFD Modeling: A Real Case Study of Near-Source Depositions of Traffic-Related Particulate Matter along a Motorway

et al. 2020

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A test site located along a 12-lane motorway east of Montpellier, France, is used to evaluate the potential of biomagnetic monitoring on traffic-related particulate matter (PM) to parametrize a computational fluid dynamics (CFD) simulation of the local airflow. Two configurations were established on the site with three vegetated flat-top earth berms of a basic design, and a fourth one was located windward to the traffic roofed with a 4-m-high precast concrete wall. As a first step, PM deposition simultaneously on plant leaves, on low-cost passive artificial filters, and on soils was estimated from proxies supplied by magnetic and X-ray fluorescence measurements on both sides of the motorway. These latter revealed that traffic-related pollutants are present on soils samples highlighted with a clear fingerprint of combustion residues, and wears of breaks, vehicles, and highway equipment. Maximum PM accumulations were detected in the lee of the berm–wall combination, while no significant deposition was observed on both sides of the flat-top earth berms. These results are in line with measurements from PM µ-sensors operated by the regional state-approved air quality agency. Finally, we compared the experimental measurements with the outcomes of a computational fluid dynamics (CFD) modeling based on the Reynolds-Averaged Navier–Stokes (RANS) equations that consider the traffic-induced momentum and turbulence. The CFD modeling matches the experimental results by predicting a recirculated flow in the near wake of the berm–wall combination that enhances the PM concentration, whereas the flat-top berm geometry does not alter the pollutants’ transport and indeed contributes to their atmospheric dispersion.

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Section: Assessment Of the Velocity Field Umentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Biomagnetic Monitoring vs. CFD Modeling: A Real Case Study of Near-Source Depositions of Traffic-Related Particulate Matter along a Motorway

et al. 2020

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“…For the numerical integration of equation ( 22), Euler's method is used [18]. This method is also used for the numerical solution of equations (7 -9).…”

Section: Numerical Modelingmentioning

confidence: 99%

“…source and their amount, as well as on the geometry of the car. Further research is supposed to be carried out taking into account the terrain [18] and the joint use of barriers and other technical means (local suctions) to reduce the level of chemical pollution of the air near the road.…”

Section: Nomentioning

confidence: 99%

Computing Model for Simulation of the Pollution Dispersion Near the Road With Solid Barriers

et al. 2021

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In this study, a numerical model is proposed for calculating pollution zones near the road, taking into account the geometry of the automobile transport, meteorological conditions, the location of the barriers and their height, and the chemical transformation of nitrogen oxides in the atmospheric air. The numerical solution is based on the integration of the mass transfer equations using the finite-difference method. To determine the components of the air flow velocity vector, a two-dimensional model of the potential flow is used, where the Laplace equation for the velocity potential is the modeling equation. Based on this numerical model, a software package has been developed that allows computational experiments and does not require large expenditures of computer time. Based on the results obtained, an assessment was made of the effectiveness of the use of barriers to reduce the level of air pollution near highways. It has been established that the use of barriers of different heights reduces the level of pollution behind the road by approximately 20-50%.

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“…However, it is important issue for the health of people living or working in such areas. Although there are many studies about road pollution dispersion around noise barrier [BALDAUF et al 2016;ŚWIETLIK et al 2015;TRUJILLO-GONZÁLEZ et al 2016] the influence of road and sound walls configuration has not been fully investigated [JEONG 2015].…”

Section: Introductionmentioning

confidence: 99%

Urban planning solutions in the context of dispersion of road pollution

Jakubiak

Urbański

2016

Journal of Water and Land Development

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Dense road network change the landscape as well as in many different ways affect the environment and living organisms. The works on reducing the exposures to traffic pollutants carried out all around the world. In the last decade, noise barriers in large numbers began to appear along the main streets and became a common feature of urban architecture in Poland. Besides being barriers to the spread of the noise on the neighboring areas these constructions might also contribute to reducing the spread of air pollution, especially road dust particles with associated trace metals (Cd, Cu, Mn, Ni, Pb, Zn).The aim of the study described in the article was to examine if the extent to which "green walls" noise barriers and transparent acrylic-glass noise barriers located along roads can contribute to a change in the spread of trace elements from the road traffic to outside of the road area. Toxic metals which occur in road dust in significant concentrations (Cu, Fe, Mn, Pb and Zn) were selected and their concentrations in soil samples were examined. The samples were collected at close vicinity of the road edge in an open area as well as in an area with noise barriers.

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A CFD Study of Roadside Barrier Impact on the Dispersion of Road Air Pollution

Cited by 10 publications

References 16 publications

Biomagnetic Monitoring vs. CFD Modeling: A Real Case Study of Near-Source Depositions of Traffic-Related Particulate Matter along a Motorway

Biomagnetic Monitoring vs. CFD Modeling: A Real Case Study of Near-Source Depositions of Traffic-Related Particulate Matter along a Motorway

Computing Model for Simulation of the Pollution Dispersion Near the Road With Solid Barriers

Urban planning solutions in the context of dispersion of road pollution

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