河套盆地地下水环境背景值研究

Study on groundwater environmental background values in Hetao Basin

根据河套盆地地下水含水层的结构、地下水补径排条件、地形地貌及区域地质构造等要素将河套盆地划分为5个地下水环境水文地质分区。查阅、收集了175组各地下水环境系统分区已有地下水水化学数据,结合本次工作获取的505组水化学数据进行全面分析,首次建立了河套盆地不同地下水环境水文地质分区15个无机指标的地下水环境背景值系列。并对地下水主要组分背景值空间分布规律进行分析,得出TDS和SO■、Cl^-的背景值分布特征具有明显一致性,符合地下水补径排和水质形成演化规律。为合理评价河套盆地地下水水质、地下水污染程度提供科学依据。

According to the structure of groundwater aquifer,groundwater recharge and drainage conditions,topography and geomorphology and regional geological structure,the Hetao Basin is divided into five groundwater environmental hydrogeological zones.The groundwater environmental background values of 15 inorganic indexes in different groundwater environmental hydrogeological zones of Hetao Basin are established for the first time by consulting and collecting 175 groundwater hydrochemical data and 505 groundwater hydrochemical data obtained in this work.By analyzing the spatial distribution law of background values of main groundwater components,it is concluded that the distribution characteristics of background values of TDS,SO■and Cl^-are consistent obviously,which conforms to the rule of groundwater recharge and drainage and water quality formation and evolution.The results provide scientific basis for reasonable evaluation of groundwater quality and pollution degree in Hetao Basin.