声屏障对城市道路环境空气质量的影响规律研究

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Abstract To precisely quantify the impact of sound barriers on air quality of urban road, we applied the fluidyn-Panache simulation and CFD solver to launch numerical models and analysis based on the three-dimensional computational fluid dynamics theory. We compared the wind velocity vector maps and contaminant concentration nephograms of PM_2.5, CO and NO_x near the road under both presence and absence of noise barriers, monitored the contaminant concentration in the simulation area on the spot, and evaluated the regularity of impacts of barriersbarriers on air quality of urban road environment. Our results showed that 1) the wind speed inside the road decreased from 2m/s to 0.02m/s; 2) the concentration of CO and NO_x inside the road increased by 40% to 50%;3) the concentration of PM inside the road dropped by 50%;4) the concentration of CO and NO_X₃ outside the road decreased by 20% to 50%; and 5) the concentration of PM outside the road reduced by 20% to 38%. We found that 1) the noise barriers blocked the flow of wind, weakened the intensity of wind, and changed the direction of wind from vertical to upward to along the road; 2) by changing the direction of wind pollutants gather in the road, the concentration of gas pollutants rises; and 3) the flow of wind to the outside, gas pollutants out of the road, as well as the extent of lateral diffusion drop. Noise barriers has a significant effect on the PM_2.5 concentration in the buildings on the inside and outside of the road that PM_2.5 decreases significantly compared with that of the silent barriers.

Key words： road sound barriers ambient air quality pollutant diffusion

Received: 25 February 2019

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X51

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	Articles by authors
	QIN Xiao-chun
	LIU Rui
	HAN Ying

Cite this article:

QIN Xiao-chun,LIU Rui,HAN Ying. The impact of sound barriers on air quality of urban road environment[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(8): 3558-3571.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I8/3558

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