河套平原地下水环境背景值

Background value of groundwater environment in Hetao Plain

以河套平原地下水水质调查采集的700余组地下水水化学样品分析数据为依据,在分析研究区域地下水流场、补给径流条件的基础上,对河套平原进行了较为详细的地下水环境分区,利用数理统计方法求取了不同分区内地下水环境背景值,并对地下水环境背景值进行了详细的比较分析,得出了地下水中主要组分背景值在区域上的分布规律。结果表明:区内主要常规组分(TDS、总硬度、总碱度等)及超标组分AS、TFe等含量背景值的差异,与地下水的补、径、排和沉积环境条件具有密切的关系。

In this paper,relatively detailed groundwater environment subregions are divided in Hetao Plain on the basis of the analysis results of regional groundwater flow field,recharge and discharge conditions.Background values of different subregions are calculated and compared by using mathematical statistic method,and the regional distribution pattern of groundwater background values for dominant components are obtained on the basis of more than 700groundwater samples collected from Hetao Plain during the groundwater quality investigation.The results show that the differences of background values among major components,such as TDS,total hardness,total alkalinity and some standard-exceeding components,such as arsenic and TFe,are in close relationship with groundwater recharge,runoff,discharge and depositional environment conditions.