摘要
以无量纲化后的雨水径流污染物和径流输送量为基础,通过引入间隙函数,建立了雨水径流污染物的初期冲刷效应定量评价公式,对建筑屋顶雨水初期冲刷现象进行了研究。结果表明:(1)建筑屋顶雨水径流污染物浓度总体上呈现出前期高于后期的现象,且污染物浓度较低,建筑屋顶雨水利用可作为雨水利用的优先方向。(2)间隙函数存在峰值区域,峰值区域的无量纲化雨水径流量总体处于0.3～0.6。随着降雨强度的增加,间隙函数峰值区域出现时间总体呈现提前趋势。(3)控制建筑屋顶雨水径流深度1.6～2.0 mm就可以达到污染物高效控制的目的。从雨水利用角度,建筑屋顶雨水利用时,初期雨水径流弃流深度也应为1.6～2.0 mm。(4)建筑屋顶雨水径流污染物的初期冲刷强度(SFF)均大于0,显示了较强的初期冲刷效应。随着降雨强度的增加,SFF平均值增加。不同的污染物具有不同的SFF,SFF平均值由高到低分别为TP、TN、SS、COD,但总体相差不大。
Base on the dimensionless handled rainwater runoff pollutants and runoff volume,the equation for quantitative evaluation the first flush effect of rainwater runoff pollutants was established by introducing a clearance function.The established equation was applied to investigate the first flush phenomena of rainwater runoff from build roof.Results showed that the concentration of runoff pollutants in initial period was general higher than that in later periods;roof rainwater runoff could be reutilized for the concentration of pollutants in roof runoff was relatively low;there was peak area existed in the clearance function,the dimensionless cumulative runoff volume in this peak area ranged from 0.3 to 0.6,the peak area was advanced with increasing the rainfall intensity;the optimum initial runoff depth for runoff pollutants control was 1.6-2.0 mm;The strength of first flush（SFF） was commonly positive,which indicated the strong first flush phenomena of roofs rainwater runoff.The average SFF value was positively correlated with rainfall intensity,the average SFF value of different pollutant follow the sequence of TPTNSSCOD,and there difference was not obvious.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2011年第6期32-35,共4页
Environmental Pollution & Control
基金
甘肃省环境保护科技计划项目(No.GSEP2010-02)
关键词
初期冲刷
雨水径流
面源污染
first flush
rainwater runoff
nonpoint source pollution
