陕西省大荔县高氟地下水的形成条件分析

The formation regularity of high-fluorine groundwater in Dali County,Shaanxi Province

为了查明陕西省大荔县高氟地下水的分布、形成条件,本文通过环境地质调查及水样测试,从地层、气象、地质地貌、水文地质及水文地球化学等几个角度进行了系统分析。研究表明,大荔县高氟地下水的分布、形成条件受地质、气候、地貌和水文地质的控制,大气降水在入渗过程中通过水岩作用及淋滤作用将岩石和土壤中氟元素带入地下水中,在蒸发作用下浓缩,最终形成高氟地下水。该研究可为解决大荔县饮水安全问题提供水文地质依据。

To find out the distribution and formation conditions of high-fluorine groundwater in Dali County, Shaanxi Province, the authors made a systematic analysis from several angles, such as strata, weather, terrain and landform, hydrogeology and hydrochemistry. The results show that the high-fluorine groundwater is jointly controlled by terrain, landform and hydrogeology. Meteoric water brings fluorine element in rock and soil into groundwater through water-rock reaction during its infiltration and leaching, and such water is concentrated during the evaporation to form high-fluorine water. This research provides hydrogeological grounds for solving the problem of safe water drinking in Deli County.