Field investigation of roadside vegetative and structural barrier impact on near-road ultrafine particle concentrations under a variety of wind conditions
Field investigation of roadside vegetative and structural barrier impact on near-road ultrafine particle concentrations under a variety of wind conditions
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DOI：
10.1016/j.scitotenv.2011.12.002
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发表时间：
2012-03-01
影响因子：
9.8
通讯作者：
Jackson, Laura E.
中科院分区：
文献类型：
--
作者：
Hagler, Gayle S. W.;Lin, Ming-Yeng;Jackson, Laura E.
路旁的屏障，例如树架或隔音屏障，在很多人口稠密的地区普遍存在，并已被证明会影响交通废气的扩散。如果路边的隔音屏障或树木能持续降低近路面环境的地面空气污染物浓度，这可能是一个减少沿着人口密集的交通走廊暴露于空气污染物的切实可行的策略。本研究测量超细颗粒（UFP）的浓度，使用仪器化的移动的测量方法，收集数据的主要道路和附近的道路位置超过四十个采样会议在中部北卡罗来纳州，美国的三个地点。两个采样点有相对较薄的树木，一个万年青，一个落叶，沿着一部分的道路。第三个取样点沿着有一堵砖砌隔音墙。在距离道路10 m处，使用移动的采样平台测量的UFP在砖形隔音墙后比在多种气象条件下没有屏障的附近位置低约50%。植被屏障区的UFP趋势是可变的，屏障效应是不确定的。在某些情况下，在植被屏障后面观察到的浓度高于空地，这可能是由于稀疏的树木林隙允许交通相关空气污染物传输到植被后面的道路附近地区。道路上的采样显示，在UFP水平没有一致的差异，在道路上的道路部分，或没有路边的障碍存在。这些研究结果支持的概念，坚实的路边障碍，可以减轻近路的影响。考虑到植物屏障在城市景观中的共同效益，关于其他配置植物屏障的缓解潜力的研究（例如，更大的密度，更宽的缓冲区）。由爱思唯尔公司出版
Roadside barriers, such as tree stands or noise barriers, are prevalent in many populated areas and have been shown to affect the dispersion of traffic emissions. If roadside noise barriers or tree stands are found to consistently lower ground-level air pollution concentrations in the near-road environment, this may be a practical strategy for reducing exposures to air contaminants along populated traffic corridors. This study measured ultrafine particle (UFP) concentrations using an instrumented mobile measurement approach, collecting data on major roadways and in near-road locations for more than forty sampling sessions at three locations in central North Carolina, USA. Two of the sampling sites had relatively thin tree stands, one evergreen and one deciduous, along a portion of the roadway. The third sampling site had a brick noise wall along a portion of the road. At 10 m from the road, UFPs measured using a mobile sampling platform were lower by approximately 50% behind the brick noise wall relative to a nearby location without a barrier for multiple meteorological conditions. The UFP trends at the vegetative barrier sites were variable and the barrier effect is uncertain. In some cases, higher concentrations were observed behind the vegetative barrier, with respect to the clearing, which may be due to gaps in the thin tree stands allowing the transport of traffic-related air pollution to near-road areas behind the vegetation. On-road sampling revealed no consistent difference in UFP levels in on-road portions of the road with or without a roadside barrier present. These findings support the notion that solid roadside barriers may mitigate near-road impact. Given the co-benefits of vegetative barriers in the urban landscape, research regarding the mitigation potential of vegetative barriers of other configurations (e.g., greater density, wider buffer) is encouraged. Published by Elsevier B.V.