School of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China.
Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China E-mail:
Water Sci Technol. 2020 May;81(9):1961-1971. doi: 10.2166/wst.2020.249.
An extensive field survey was conducted in four types of road area to study heavy metals in road runoff. Eleven rainfall events were monitored from February 2011 to March 2012, which were classified into four categories according to the relationship between peak of the rainfall amount, rainfall duration, and average rainfall intensity. Runoff samples were collected from overpass sections, college areas, residential areas, and road sidewalks. Heavy metal concentrations were obtained to investigate the outflow laws governing heavy metals in runoff. The concentration fluctuations of seven heavy metals were monitored to assess the influence of rainfall characteristics on metal concentrations. To estimate the impact of heavy metals on the water environment, the event mean concentrations (EMCs) were determined to describe the overall pollution degree of heavy metal in runoff, and then the EMC values of heavy metals in runoff were compared with surface water environmental quality standard thresholds. The results indicate that the EMC values of heavy metals varied widely in different rainfall fields and under the same rainfall at different sampling points. Average rainfall intensity has a significant impact on the EMC of heavy metal outflow, followed by maximum rainfall intensity and rainfall amount.
进行了广泛的现场调查，以研究道路径流中的重金属。从 2011 年 2 月至 2012 年 3 月，监测了 11 场降雨事件，并根据降雨量峰值、降雨持续时间和平均降雨强度之间的关系将其分为四类。从立交桥段、大学校区、居民区和道路人行道收集径流样本。重金属浓度的测定结果用于研究重金属在径流中的运移规律。监测了七种重金属的浓度波动，以评估降雨特征对金属浓度的影响。为了评估重金属对水环境的影响，确定了事件平均浓度（EMC）来描述重金属在径流中的整体污染程度，然后将径流中重金属的 EMC 值与地表水环境质量标准阈值进行比较。结果表明，不同降雨场和同一降雨条件下不同采样点的重金属 EMC 值差异很大。平均降雨强度对重金属流出的 EMC 值有显著影响，其次是最大降雨强度和降雨量。
