北京市典型流域降雨前后水质变化研究

Changes of water quality before and after rainfall in Typical Watersheds in Beijing

为探索北京市降雨对河流水质的影响,本研究分析了通惠河流域、小中河流域、海子水库流域等3个流域降雨前后主要河流水质变化特征,解析了3个流域的主要水质指标变化趋势,结果表明:降雨后COD_(Cr)、NH_(3)-N与TP的变化趋势基本一致,表现为降雨级别为小雨、大雨和暴雨时,降雨后COD_(Cr)的浓度比降雨前低;降雨级别为中雨时,降雨后COD_(Cr)的浓度比降雨前高。TN降雨后浓度变化与降雨级别关系不大,浓度变化不明显。本研究为北京市科学制定水资源保护规划方案及水污染防控措施提供技术支撑。

In order to explore the impact of rainfall in Beijing on the water quality of rivers,the main water quality indicators changes of three rivers were analyzed in this study before and after rainfall such as in the Tonghui River Basin,Xiaozhong River Basin,and Haizi Reservoir Basin.The results were shown that the change of TP after rainfall was similar to that of COD_(Cr) and NH_(3)-N.When the rainfall level was light,heavy and storm,the concentration of COD_(Cr) after rain was lower than before rain.When the level was moderate,the concentration of COD_(Cr) after the rain was higher than before the rain.The concentration change of TN was not obvious and had little relationship with the rainfall level.This research provides technical support for the scientific formulation of water resources protection planning and water pollution prevention and control measures in Beijing.