济南城区不同下垫面雨水径流水质变化规律研究

Research on changing rules of storm runoff water quality in different underlying surface Jinan urban area

了解径流水质变化规律是控制与治理径流污染实现雨水资源化的前提和基础。通过对济南城区不同下垫面多次降雨事件不同降雨历时的雨水径流进行采样并检测,分析了济南雨水径流的水质特性、雨水径流冲刷规律及其主要影响因素。试验结果表明:不同下垫面雨水径流水质差异大,初期径流中污染物质含量高,随降雨历时的延长径流中污染物浓度迅速降低,径流水质受局部环境影响明显,SS与CODCr、TP、TN等污染指标具有较好的正相关性等特性,并模拟得出济南不同下垫面径流污染物浓度变化模型,分析了初始径流中的污染物浓度、综合冲刷系数K等影响冲刷规律的主要因素,提出了雨水水质控制与利用的建议。

It＇s the prerequisite and basis to comprehend the runoff water change rule,which can control and governance runoff pollution,realize recycling of the rain.By means of sampling and testing different rainfall duration and different underlying surface of the stormwater runoff of the multiple rainfall events in Jinan,the study to analyze the water quality character,the rule of scouring of the stormwater runoff and the main influence factors of the stormwater runoff.The results show that in the early runoff contents high pollution matter,with the changing of the rainfall duration the pollution concentration in runoffs falls rapidly,the water quality of the rain of the stormwater runoff differs greatly in different underlying surface.The water quality of the runoff is impacted obviously by local environment,pollution index such as SS and CODCr and TP and TN have a very good positive correlation and other characteristics.By simulation,the study obtains the runoff pollutant concentration change model of Jinan urban area,analyzes the pollutant concentration of the initial runoff,composites the main factors of influence scouring law（the coefficient of scouring（K）） and puts forward water quality control and utilization suggestions according to different water quality characteristics and scouring rule.