北京市公路立交桥路面雨水径流水质特征分析

Analysis of Water Quality Characteristics of Storm Runoff on Overpass Surface in Beijing

为提出立交桥区雨水径流有效的净化控制措施,并制定合理可行的桥区雨水收集利用方案,加速城市雨水资源的利用,对北京市某立交桥路面径流雨水水质变化规律进行了分析,并且评价了雨水的质量及主要影响因素。结果表明,立交桥雨水初期径流污染严重,采集水样的初期各项指标除pH在可利用范围内外,其他均显示出不同程度的污染。降雨达到30min后,大多指标已经稳定在可利用的范围内,而SS浓度、Pb浓度等污染依然未达到使用标准。通过相关性分析,各主要水质污染指标均存在显著的线性关系,指出了不同污染物间的联系与区别,据此可为制定有效的控制措施提供参考依据。

The purpose of this paper is to give an effective measure of purifying stormwater runoff in overpass area, formulate reason- able and feasible scheme of rainwater collection and utilization in overpass area, and accelerate the utilization of urban rain resources. Meanwhile, the water quality change law of stormwater runoff of a certain overpass in Beijing is analyzed and the water quality and main influencing factors are assessed in this paper. The result shows that the initial stage of storm runoff is polluted severely. Except that the pH index is in available range, all of the other indexes show different levels of pollution. When the rainfall duration reaches to 30min, most of the indexes maintain a stable available range. But the concentration of SS, Pb and others still remain unavailable standard. Through correlation analysis, it can be found that all the main pollutants of water quality have significant linear relation- ship. And the contact and difference between different pollutants are pointed out. This conclusion can provide a reference for the for- mulation of effective control measures.