城市降雨屋面径流污染分析和管理控制

城市屋面是城市不透水面积的一个重要组成部分，屋面径流是城市非点源污染的一个重要来源。分析国外对屋面径流水质研究情况并结合自己的实验结果发现，屋面径流水质含有的污染物浓度较高。实验研究表明不同屋面材料、屋面的使用时间长短、位于不同功能区的屋面其径流中污染物浓度存在有很大的差异，其大致的规律是混凝土屋面径流的污染指标基本上都比较高，屋面使用的年载越长，其径流中污染物浓度相对越高，靠近交通要道的屋面，径流中污染物浓度都较高。用无量纲累积污染物量与累积径流量的比值方法分析初始冲刷效应，发现屋面径流初始冲刷比较明显。屋面径流处理后实现再利用，处理过程简单，可以成为城市用水的一个重要来源。

PRIMARY RESEARCH ON POLLUTION OF URBAN ROOF RUNOFF

Urban roof is one of the components of urban imperviable areas and the roof runoff is an important source of urban nonpoint source pollution. By analyzing the abroad research situation of roof runoff and experimental results ,it is indicated that the contaminants concentration of roof runoff is relatively high. The results indicated that the different roof materials,the using time of roofs and roofs in different area, the concentration of contaminants are different.The contaminants concentration of runoff from roof made with concrete or used for a long time or near traffic way was always high.The analysis of the first flush in dimensionless cumulative method indicated that the first flush was evident for roof runoff.Roof runoff can be treated easily and reused, which costs less and is an important source of urban water resource utilization.