基于同位素技术的冬奥会崇礼赛区地表水-地下水转化关系研究

Researches on the Surface Water and Groundwater Interaction in Qingshuihe Basin Based on 222Rn,D and 18O Environmental Isotopes

为深入理解崇礼区清水河流域地表水-地下水转化关系,通过D、18O、222Rn环境同位素技术开展了区域地表水-地下水的转化关系研究。结果表明:通过D、18O监测结果可知,东沟中游地区表现为地下水溢出补给地表水,地表水接受地下水泄流补给的贡献为56%,接受上游河水补给为44%;通过222Rn监测结果可知,上游段地表水向地下水转化,地表水向地下排泄27.8 m^3/(d·m);下游段地下水向地表水转化,地下水向地表水补给平均速率为17.6 m^3/(d·m)。由此可见,地表水-地下水的频繁转化是清水河流域水资源循环的主要特征,地下水泄流补给地表水是区内旱季水资源的主要补给来源。

In order to understand the interaction between surface water and the groundwater in Qingshuihe Basin in Chongli Area,the environmental isotopic D,18O and 222Rn in surface water and groundwater are analyzed,the study results show that:the calculation results based on the D and 18O,the surface water in middle stream of Donggou River have been recharged by groundwater and river water upstream,the percentage of groundwater recharge is 56%;the calculation results based on the 222Rn,the average seepage rate of surface water is 27.8 m^3/(d·m)in the upstream section,and the average recharge rate of groundwater is 17.6 m^3/(d·m).It is concluded that,the groundwater and surface water interaction is the main characteristics and processes of water cycle in Qingshuihe Basin,and groundwater recharge is the main sources of surface water in draught seasons.