澳门城市路面地表径流特征分析

Characterization of urban roadway runoff in Macao

对澳门半岛孙逸仙大马路两场降雨时段的地表径流进行采样监测,项目包括浊度、CODCr、Pb、Zn、Cu.结果表明,初期径流水质中浊度和CODCr极高,但随着降雨冲刷强度的增大,SS和Pb的监测浓度增加.路面径流水质参数随降雨径流历时变化的过程曲线,很大程度上取决于降雨特征、路面车流量和路面垃圾清扫状况.2场降雨路面径流初始冲刷现象定量分析结果正好相反,反映了路面径流特征的不确定性和复杂性,因此,需对路面径流冲刷、累积过程的影响因素进行综合考虑.

Characteristics of surface runoff from urban roadway in Macao was preliminarily investigated. Water quality parameters such as turbidity, CODcr, Zn, Pb, and Cu were analyzed. The major pollutant from urban roadway runoff in Macao is CODcr. Pb and SS are the other two major potential pollutants with rainfall intensity increasing. Through hydrographs and pollutograph analysis, rainfall, traffic and street-sweeping conditions significantly affect the pollutants profile between rainfall events. First flush effects were further evaluated on urban roadway runoff from two typical rainfall events, which leaded to an opposite result. In order to characterize the urban roadway runoff, factors influencing the build-up and wash-off processes of surface runoff should be synthetically taken into consideration.