阿拉善诺日公地区地下水系统水化学特征分析

Hydrochemical Characteristics of Groundwater System in Nuorigong Basin

阿拉善左旗诺日公是我国典型干旱区,地下水是该区主要的供水水源。水化学研究对地下水流动过程具有指示意义。以阿拉善诺日公地区地下水为研究对象进行水文地球化学特征分析,研究表明:从北部基岩隆起区到豪斯布尔都盆地中心,地下水水化学特征呈现一定的规律性,水化学类型由低矿化度的Na-HCO_3·Cl、Na-Cl·HCO_3型,逐渐过渡到盆地中心排泄区高矿化度的Na-SO_4·Cl、Na-Cl·SO_4型水,水质状况变差,由淡水逐步过渡到微咸水。区域地下水整体从西北向东南排泄,TDS的升高较好地指示了地下水的径流方向。蒸发作用是本区地下水化学构成的主控因素,同时溶滤作用、离子交换作用及人类活动对地下水化学成分也有影响。本研究为该地区水资源评价及优化配置提供了科学依据。

The Nuorigong basin in the Alaxa area belongs to typical arid region where groundwater is the mainly source of water supply.Hydrogeochemical characteristics research has directive significance to groundwater flow process which provides a theoretical basis for sustainable exploitation of groundwater resources in arid areas.The groundwater in Nuorigong basin was taken as the research object to analyze the hydrogeochemical characteristics.The results show that the hydrochemical characteristics of the groundwater have certain regularities from northern bedrock to basin center.The dominant hydrochemical types change from Na-HCO3.Cl and Na-Cl.HCO3 in mountains to Na-SO4.Cl and Na-Cl.SO4 in the center of the basin.TDS increases gradually from northwest to southeast,which indicates the direction of groundwater flow in this area.The groundwater chemical composition is mainly controlled by evaporation,dissolution,ion exchange and anthropogenic activities.Thisresearchisofgreatsignificance forlocalgovernmentsthatcan makeeffectivemanagementandprotection ofgroundwaterinAlaxa area.