华南地区城市道路雨水径流对降雨特征的响应机制——以深圳市为例

RESPONSE OF URBAN ROAD RUNOFF QUALITY TO RAINFALL CHARACTERISTICS IN SOUTH CHINA,A CASE STUDY IN SHENZHEN CITY

合理设计道路面源污染控制设施(如低冲击开发设施)需要深入掌握被治理地区的径流污染特征及其影响因素。通过利用单变量与多变量数据分析相结合的方式对位处华南地区的深圳市道路雨水径流特性进行研究,结果表明道路雨水径流污染与降雨特征和污染物种类有着密切的关系。氮类污染物在小雨强所产生的降雨径流中浓度较高而颗粒物则相反,化学需氧量和磷随降雨特征变化相对较小。这说明不同的污染物种类呈现出对降雨特征不同的响应机制。因此在设计相关径流污染控制措施时,应该选择合适的降雨类型作为设计依据以满足对不同污染物的去除要求。

The effective design of stormwater treatment mitigation( such as low impact development) closely relies on an in-depth understanding of the relationship between stormwater quality and its influential factors. The paper investigated the road runoff quality characteristics in Shenzhen City,which is a city in South China using the combination of univariate and multivariate data analysis techniques. The outcomes indicate the strong relationship among road runoff quality,rainfall characteristics and pollutant species. It was noted that low-intensity rainfall events produced high concentration of nitrogen while the opposite holds true for suspended solids. However,COD and total phosphorus did not show a significant relationship with rainfall characteristics. This means that designing the treatment mitigation according to the targeted pollutant wash-off characteristics should be the preferred option rather than'one-size-fits-all'strategy.