The influence of road noise barrier on the diffusion of traffic air pollutants
Road noise barrier is the primary physical measure to alleviate the noise pollution of expressway,and it can affect the diffusion of traffic air pollutants to a certain extent.To investigate the impact of road sound barriers on the dispersion of traffic-related air pollutants,a simulation of pollutant dispersion was conducted using Fluent,which is based on fluid dynamics theory.This study examines the impact of changes in the height of road sound barriers and the distance of pollution sources outside the expressway.It compares the diffusion distribution of pollutants under different working conditions and ultimately derives the effect of road sound barriers on air pollutants.The results indicate that road sound barriers can effectively reduce pollutant concentration near the downwind side of the expressway and block the diffusion of pollutants outside the road at the upwind side.The concentration of pollutants is reduced by over 30%under the 5 m sound barrier condition.Furthermore,the concentration of pollutants decreases as the distance from the source outside the expressway increases.Without an acoustic barrier,the concentration of pollutants within an 80 m range on the windward side of the source decreases by 15%and 38%at distances of 400 m compared to 300 m and 200 m,respectively.However,the effect is inhibited by acoustic barriers,resulting in a decrease of 13%and 25%with 5 m of acoustic barriers,respectively.When considering the use of sound barriers or related physical structural modifications to mitigate traffic air pollution,it's important to take into account their advantages and disadvantages.Sound barriers can reduce regional exposure levels,but they can also hinder the dispersion of pollutants to some extent.
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