北京市官厅水库流域近50年氟化物时空变化

Temporal and Spatial Changes of Fluoride in the Guanting Reservoir Basin in Beijing over the Past 50 Years

为更好地了解官厅水库氟化物演变过程,揭示官厅水库水体氟化物浓度高的原因,本文对官厅水库1973-2022年的氟化物数据进行了分析,结果表明,氟化物主要来源于入库3条河流中的洋河;自1994年以来,库区氟化物浓度逐渐升高,水质超过Ⅲ类水标准;出库氟化物浓度变化不大,氟化物浓度整体呈升高趋势。通过季节变化分析,除下花园桥站,其他站点氟化物浓度汛期均高于非汛期。通过t检验,除涿鹿桥站,其他站点氟化物浓度汛期和非汛期之间的差别不显著。官厅水库高氟化物含量主要源于上游来水。研究成果可为官厅水库制定氟化物污染防控对策提供基础数据和技术支撑。

To better understand the evolution of fluoride in the Guanting Reservoir and to reveal the reasons for the high fluoride concentrations in the reservoir’s water,this paper analyzes fluoride data from 1973 to 2022.The results indicate that fluoride mainly originates from the Yanghe River,one of the three rivers flowing into the reservoir.Since 1994,fluoride concentrations in the reservoir have gradually increased,surpassing the Class III water quality standard.The fluoride concentration at the reservoir’s outlet has shown little variation,with an overall upward trend.Seasonal analysis reveals that,except for the Xiahuayuanqiao Station,fluoride concentrations during the flood season are higher than those during the non-flood season at other monitoring stations.Using t-tests,significant differences in fluoride concentrations between the flood and non-flood seasons are found at all stations except for the Zhuolu Bridge station.The high fluoride levels in the Guanting Reservoir are primarily due to upstream inflow.The findings provide fundamental data and technical support for the prevention and control of fluoride pollution in the Guanting Reservoir.