济南市不同下垫面降雨径流水质变化特征分析

An Analysis of the Variation Characteristics of Rainfall Runoff Water Quality in Different Underlying Surfaces in Jinan

分析济南市城区在降雨时期不同下垫面径流的污染物含量变化过程,可以为更加合理的利用雨水资源,减轻水资源供需矛盾给城市建设带来的压力提供理论依据。在对居民区屋面径流、居民区道路径流、高架桥雨水径流、河道采用水质单因子评价法分析各下垫面径流污染物浓度变化的前提下,采用综合水质标识指数评价法进一步实施水质评价,分析地表径流水质在降雨时期的时空变化规律。结果表明:屋面径流及居民区道路径流的降雨初期污染最为严重,且初期冲刷作用明显,降雨后期径流水质较好;高架桥路面径流污染相对较轻,河道水质较差,局部河段严重超过城区径流水质Ⅳ类水标准,不可直接利用。

An analysis of the change process of pollutant content in different underlying surface runoff in urban area during rainfall period can provide a theoretical basis for the more rational use of rainwater resources and reduce the pressure of water supply and demand contradiction for urban construction.Under the premise of analyzing the change of pollutant concentration of each underlying surface runoff by using the single-factor evaluation method of water quality in the residential area runoff,residential area road runway,residential road path flow,viaduct rainwater runoff and river channel,the water quality evaluation is further implemented by comprehensive water quality index evaluation method.The temporal and spatial variation of surface runoff water quality during rainfall periods.The results show that the initial pollution of the roof runoff and the residential road path is the most serious,and the initial flushing effect is obvious.The runoff water quality is better at the later stage of the rainfall.The runoff pollution of the viaduct is relatively light,the water quality of the river is poor,and a part of river section seriously exceeds the urban runoff water quality class IV water standards are not directly usable.