石嘴山市浅层地下水的环境背景值  

Environment background levels of phreatic water in Shizuishan

作　　者：方媛[1,2] 吴昊[1,3] 霍晨琛 钱会[1,3] 

机构地区：[1]长安大学环境科学与工程学院,西安710054 [2]宁夏国土资源调查监测院,银川750001 [3]旱区地下水文与生态效应教育部重点实验室,西安710054

出　　处：《环境化学》2016年第7期1361-1371,共11页Environmental Chemistry

基　　金：国家自然科学基金(41172212)资助~~

摘　　要：根据水文地质条件将研究区划分为单一潜水区和多层结构区两个地下水环境背景值单元,以石嘴山市大武口区和惠农区1997年和2008年的浅层地下水水质分析数据为依据,主要采用迭代标准差法和计算分布函数法对两个背景值单元内的15项指标进行了背景值范围的计算.在此基础上比较分析了研究区背景值的时空分异特征,结果表明,气象、水文、人类活动等变化较大的因素会使地下水的化学组分随时间呈现出一定的变化,即地下水环境背景值的时间差异性;而地形地貌、含水层岩性、地下水径流条件的差异是影响不同地下水环境背景值单元内相同指标背景值差异的主要因素,即背景值具有空间差异性.对地下水环境背景值进行水质评价,结果表明,2008年较1997年,地下水质量变差.In this paper,two groundwater environment subregions were divided in the study area on the basis of hydrogeological condition, according to phreatic water quality analysis results in Dawukou District and Huinong District of Shizuishan in 1997 and 2008. Fifteen background levels indices of the two subregions were calculated by using the iterative 2-σ technique method and the calculated distribution function method. Then the spatial and temporal differences of the background values were analyzed. The results show that the background levels changed greatly with meterology,hydrology and human factors, which were time-dependent. And the difference of the same background level index between the two subregions was affected greatly by landform, aquifer lithology,groundwater flow conditions. The results of groundwater quality evaluation show that groundwater quality in 2008 become poorer than in 1997.

关 键 词：环境背景值 浅层地下水 石嘴山 迭代系数法 计算分布函数法 

分 类 号：X523[环境科学与工程—环境工程]