联合利用地下水监测和示踪技术探查坝区渗漏——以河南某水库为例

Combined application of groundwater monitoring and tracing technique in reservoir leakage detection——case study of a reservoir in Henan

水库渗透严重影响水库正常功能发挥,也影响水库大坝的稳定性,因此对水库坝区渗漏研究具有重要的实际意义。本文通过监测河南某水库下游水井水位、水化学、同位素以及温度,确定坝区存在的疑似渗漏通道,为渗漏治理提供科学依据。经过数据分析,得到以下主要结论:监测井水位、水温及电导率变化情况分析结果表明沿水库至监测井J10和J11方向存在疑似地下水渗漏通道;水化学分析显示Ⅰ区J03采样点受水库来水影响最为明显,Ⅱ区J07号采样点也受到一定程度的影响,可知沿水库至采样点J03和J07方向可能存在渗漏通道;同位素示踪试验结果显示库水与Ⅰ区和Ⅲ区地下水的同位素值相近,δ^(18)O介于-5.41‰~-6.58‰,δD介于-46.72‰~-53.38‰,表明沿水库至采样点J04和J05、水库至采样点J11两个方向存在疑似渗漏通道。

The seepage of reservoir seriously affects the normal function and the stability of the reservoir dam, so it is significant to study the seepage in the reservoir dam. Based on the monitoring of water level, water chemical isotopes and temperature of a reservoir downstream in Henan Province, the suspected channel is verified and the leakage remedy basis is obtained. The changes of water level, water temperature and conductivity of the monitoring well indicates that there is a suspected groundwater leakage channel along the direction from the reservoir to the monitoring wells J10 and J11. The hydrochemical analysis indicates that the sampling point J03 in zone I is most obviously affected by the water from the reservoir, and the sampling point J07 in zone II is also affected to a certain extent, there may be leakage channels along the direction from the reservoir to the sampling points J03 and J07. The isotopic tracer test result show that the isotopic values of the reservoir water are similar to those of the groundwater in areas I and III, δ18O is between-5.41‰ and-6.58‰, δD is between-46.72‰ and-53.38‰, which indicate that there are suspected leakage channels along the two directions from the reservoir to sampling points J04 and J05 and from the reservoir to sampling point J11.