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地下水资源可持续利用的一个急待解决的重要问题,是对地下水补给和更新能力的评价。利用环境同位素技术研究地下水的补给和可更新性是当前较为新颖的方法之一。在西北干旱、半干旱的隐伏岩溶地区,地下水埋藏条件复杂,常规的地质勘探方法所能提供的水文地质信息有限,环境同位素方法在研究地下水的补给及可更新能力方面发挥了优势,可对传统方法进行补充和验证。其结果表明,研究区隐伏岩溶水形成较早,且有大量现代水的混入,平均混入量为54%。说明区内隐伏岩溶水的补给和更新能力较好。环境同位素分析结果还显示,大岔河隐伏岩溶水为一相对独立、半开放的水文地质单元,其补给来源部分为流域内大气降水、地表水的补给,部分为东南部三道沟岩溶地下水的补给;根据环境同位素EPM模型计算,地下水的滞留时间为36a。地下水储存量为1.314×108m3;储水系数为7.29×10-3。这一结果与传统勘探方法的计算结果基本吻合,说明环境同位素方法的实用性。
An important issue to be solved urgently for the sustainable use of groundwater resources is to evaluate the ability of groundwater to recharge and renew. The use of environmental isotopes to study the recharge and renewability of groundwater is one of the most recent innovations. Groundwater burial conditions are complex in the arid and semi-arid hilly karst areas of the northwest, with limited hydrogeological information available for conventional geologic exploration methods, and environmental isotope methods play an important role in studying the recharge and renewability of groundwater, Method to supplement and verify. The results show that the concealed karst water formed earlier in the study area, and a large amount of modern water was mixed with the average mixed amount of 54%. It shows that the hidden karst water in the area is better replenished and renewed. The results of environmental isotope analysis also show that the Dacha River is a relatively independent and semi-open hydrogeological unit, and its source of recharge is the supply of atmospheric precipitation and surface water in the basin and partly to the water resources of Sandou karst groundwater in the southeastern part of the country Recharge; According to the environmental isotope EPM model, the retention time of groundwater is 36a. Groundwater storage capacity of 1.314 × 108m3; water storage coefficient of 7.29 × 10-3. This result is basically consistent with the calculation results of traditional exploration methods, indicating the practicability of environmental isotope method.