Xia Leijun, Huang Dingjing, Ren Xinyi, et al. Characteristics of atmospheric particulate matter under the East First Ring Elevated Expressway in Nanchang[J/OL]. Acta Scientiarum Naturalium Universitatis Sunyatseni, 2026, 1-10.
DOI:
Xia Leijun, Huang Dingjing, Ren Xinyi, et al. Characteristics of atmospheric particulate matter under the East First Ring Elevated Expressway in Nanchang[J/OL]. Acta Scientiarum Naturalium Universitatis Sunyatseni, 2026, 1-10. DOI: 10.11714/acta.snus.ZR20250191.
Characteristics of atmospheric particulate matter under the East First Ring Elevated Expressway in Nanchang
Elevated structures at the block scale can hinder the diffusion of atmospheric particulate matter, leading to localized pollutant accumulation. To investigate the distribution characteristics of pollutant matter in these areas and their influencing factors, this study focused on the space under the East First Ring Elevated Expressway in Nanchang. Continuous field monitoring was conducted over 5 days, covering morning, afternoon, and evening rush hours at multiple locations (10 sites and 30 sampling points). This was combined with numerical simulations using
ANSYS Fluent to analyze the spatiotemporal distribution of PM
2.5
and PM
10
and their key influencing factors. The results indicated that: 1)Temporally, the particulate matter concentrations followed the order "afternoon rush hour
>
morning rush hour
>
evening rush hour", and were significantly higher on weekdays than on weekends. 2) Spatially, high-concentration areas are primarily at intersections and zones directly beneath the bridge deck, while low-concentration areas are more prevalent at T-junctions and ramp spaces. Areas with higher concentrations typically featured wider bridge decks and roads. 3)Particulate matter concentration show significant positive correlations with relative humidity, traffic flow, and black globe temperature, and significant negative correlations with air temperature. 4)Numerical simulations reveal a significant positive correlation between concentration and wind speed at low wind speeds. The elevated bridge structure reduces wind speed underneath it, creating a stagnation zone for pollutants. Different configurations of the elevated bridges and surrounding buildings generated distinct wind fields, which in turn affect particulate matter concentration variation. This study provides a scientific basis for improving environmental quality and preventing health risks in the spaces under elevated highways.
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