• 关键词：路面径流  重金属  初期效应

• 基金项目：江苏省交通科技计划重大项目(No.TZ0761-010)

• 傅大放
• 东南大学市政工程系, 南京 210096

• 石峻青
• 东南大学市政工程系, 南京 210096

• 李贺
• 东南大学市政工程系, 南京 210096

• 摘要：通过对8场降雨高速公路路面雨水径流中溶解态和颗粒态Cd、Cu、Pb和Zn4种重金属进行现场取样检测,在定性分析径流重金属污染初期效应存现的基础上,定量分析了重金属污染初期效应的显著程度,并探讨了降雨特征对径流重金属污染初期效应的影响.无因次累积负荷分数-累积体积分数曲线分析结果表明,大多数降雨事件中总重金属存在较显著的初期效应,除溶解态Pb不具有初期效应外,其余溶解态与颗粒态重金属均存在较显著的初期效应.少数降雨事件的径流在中后期存在二次冲刷效应.初期冲刷比值分析结果表明,拦截并处理径流初期25%流量(径

• Abstract：The focus of this study was the heavy metals,Cu,Zn,Pb and Cd,commonly found in land used for transportation. Dissolved and particulate-bound fraction concentrations of these metals were measured during 8 rainfall-runoff events on a representative expressway pavement in Nanjing. On the basis of a qualitative evaluation of flushing,the first flush of heavy metals was quantitatively analyzed,and the influences of hydrologic characteristics on the first flush are discussed. The results of the analysis of dimensionless normalized cumulative mass and volume curves indicated that total,dissolved and particulate-bound metals,except dissolved Pb,exhibited a pronounced first flush in most events. The second flush also exhibited in some events. The initial flush ratio demonstrated that about 35% to 39% of heavy metals could be removed from road runoff by intercepting and treating the initial 25% of the runoff water. The sequence of strength of the first flush of total metals was:Cd>Cu>Zn>Pb; for the dissolved metals:Cd>Zn>Cu>Pb; and for the particulate-bound metals:Cu>Cd>Pb>Zn. Correlation analysis suggested that the influence of mean rainfall intensity on the first flush of metals was significant,but there was no significant influence caused by other rainfall factors.

• Key words：road runoff  heavy metals  first flush

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