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分析地下水水循环机理是有效评价地下水资源量和合理开发利用地下水资源的前提。对此,利用皮帕尔(Piper)图解法分析地下水的水化学特征类型,结合区域构造水文地质和环境同位素,分析黑河中游盆地内不同地区的地下水补给机理。结果表明,位于黑河较上游地区两个相邻山前冲洪积扇之间的地下水水力联系微弱,分别来自于不同的补给来源;不同区域的黑河沿岸地区,受地理地形控制,地下水补给来源存在显著差异;以榆木山隆起相隔离的张掖盆地和酒泉盆地,地下水水化学特征和同位素存在显著差异,处于不同的地下水补给单元;利用放射性同位素氚含量,初步估算出不同地区地下水的更新期,其地下水年龄均低于32 a。为合理开发利用黑河中游地下水资源、保护脆弱的生态环境提供科学依据。
Analyzing the mechanism of groundwater circulation is a prerequisite for effectively evaluating groundwater resources and developing and utilizing groundwater resources rationally. In this regard, the Piper method is used to analyze the hydrochemical characteristics of groundwater and the regional hydrogeology and environmental isotopes are used to analyze the groundwater recharge mechanism in different areas of the middle Heihe River basin. The results show that the groundwater hydraulic connection between two adjacent foreland alluvial fans located in the upper reaches of Heihe River is weak and comes from different sources of supply respectively. The Heihe River in different regions is controlled by geographical topography and the source of groundwater recharge exists Significantly different; in the Zhangye basin and the Jiuquan basin, which are separated by the uplifted Yumusu uplift, the hydrochemical characteristics and isotopes of groundwater are significantly different and are in different groundwater recharge units. Based on the tritium content of radioactive isotopes, the renewal period of groundwater in different areas is preliminarily estimated Groundwater ages are below 32 a. It provides a scientific basis for the rational exploitation and utilization of groundwater resources in the middle reaches of Heihe River and the protection of fragile ecological environment.