大同盆地地下水流场、水化学场变化特征  

Characters of the Groundwater Flow Field and Hydrochemistry Field in Datong Basin

作　　者：韩颖[1] 

机构地区：[1]山西省地质调查院,太原030024

出　　处：《地质调查与研究》2008年第2期138-146,共9页Geological Survey and Research

基　　金：国家国土资源大调查项目:山西六大盆地地下水资源及其环境问题调查评价(200310400008)

摘　　要：通过对大同盆地开展水文地质环境调查和采取测试盆地浅层和中深层地下水样,进一步分析研究了大同盆地地下水流场现状和水化学场现状,在研究前人资料结果的基础上,对比分析了盆地地下水流场的变化,不同地区地下水位下降情况及水化学场的变化特征。认为盆地西部水位下降较东部多,南北较中部水位下降速率快;盆地补给、径流区的地下水位下降幅度较大,排泄区较小,地下水位下降幅度与本区地下水开采量基本成正比;浅层孔隙水化学类型较中深层孔隙水多,TDS相应较高。水化学场的分带性与水动力条件相吻合,浅层孔隙水化学类型较中深层孔隙水复杂。和1989年对比,大同盆地浅层地下水水化学类型及其水平分带性总体改变不大,局部略有变化,中深层孔隙水局部由于过度开采和人为污染,水质变差。According to the regional hydrogeologic and environmental geological survey , this paper studies the flow field and chemistry field of the groundwater by testing the groundwater samples from shallow and middle-deep layers. Based on the former survey result in 1986, we analyses the change characters of the flow field, chemistry field and water level decline in Datong basin. The conclusions is that the groundwater level declined faster in the western part of the basin than in the eastern part, and dropping degree of the groundwater level is bigger in recharge area and runoff area than in discharge area. It is also suggested that the chemical type of pore water in the shallow layer is more than in the middle-deep layer, and the chemical types of groundwater inosculate the hydynamical condition and the chemical types of groundwater of shallow layer are more complex than middle-deep layer. Contrasting with that in 15 years gao, the chemical types and zonation of the groundwater of shallow layer changed less, and the water in the middle-deep layer changed worse because of over pamping and artificial pollution.

关 键 词：大同盆地 地下水流场 水化学场 变化特征 

分 类 号：P614.2[天文地球—矿床学] P614.3[天文地球—地质学]