摘要
地下水背景值是衡量地下水是否遭受污染的重要依据,确定区域内地下水背景值是评价该地区地下水可持续发展的重要标尺。依据湖北省平原岗区(江汉平原、南襄盆地、汉江夹道)地形地貌、水文地质条件,划分了6个水环境单元,并选取低洼平原孔隙承压水环境单元(I_(1))、冲湖积平原孔隙承压水环境单元(I_(2))、岗地平原裂隙水环境单元(I_(3))3个水环境单元作为研究对象,运用数理统计方法确定其地下水环境背景值。结果表明:①区内地下水中较为丰富的阴阳离子为HCO_(3)-、Ca^(2+)和Mg^(2+),其水化学类型主要为HCO_(3)^(-)Ca(Mg)型水;②整体来看,低洼平原孔隙承压水环境单元(I_(1))地下水组分环境背景值最高,冲湖积平原孔隙承压水环境单元(I_(2))次之,岗地平原裂隙水环境单元(I3)最低,地下水各组分环境背景值具有明显的空间差异性;③地下水中TDS、SO_(4)^(2-)、NO_(3)^(-)浓度与土地利用类型之间的皮尔曼相关系数(ρ)分别为0.57、0.64、0.60,说明TDS、SO_(4)^(2-)、NO_(3)^(-)浓度与土地利用类型之间具有相关关系,同时说明人类活动已经对区内的地下水产生了影响。该研究结果可为湖北省平原岗区地下水污染评价提供理论依据。
Groundwater background value(GBV)is an important indicator for measuring the degree of groundwater pollution,which plays a significant role in the estimation of sustainable groundwater development in an area.In this paper,six water environment units are divided based on the topography and hydrogeological conditions of Hubei Province(Jianghan basin,the Han river plain,the south duct lining),and three of them are selected as study obj ects,involving the low-lying plain pore confined water environmental unit(I_(1)),the fluvial plain pore confined water environmental unit(I_(2)),hillock plain fissure water environment unit(I_(3)).Based on the statistical calculations of groundwater background values in the three water environment units,the results are as follows:①The main anions are HCO_(3),Ca^(2+)and Mg^(2+)in the region,and hydrochemistry type is mainly HCO_(3)- Ca(Mg).②The significant spatial heterogeneity of GBVs is demonstrated by analysis.Specifically,GBV of the low-lying plain pore confined water environmental unit is the highest,followed by the fluvial plain pore confined water environmental unit and hillock plain fissure water environment unit.③The Pearman correlation coefficients(p)of TDS,SO_(4)^(2-)and NO_(3)^(-)concentrations and land use types are 0.57,0.64,0.60,respectively,indicating that land use type is correlated with TDS,SO_(4)^(2-)and NO_(3) concentrations and human activities have significantly affected the groundwater quality in the study area.This study can provide a reliable theoretical basis for groundwater pollution evaluation and sustainable groundwater management in plain area of Hubei Province.
作者
刘左
潘欢迎
LIU Zuo;PAN Huanying(School of Environmental Studies,China University of Geosciences(Wuhan),Wuhan 430078,China)
出处
《安全与环境工程》
CAS
CSCD
北大核心
2023年第3期208-221,共14页
Safety and Environmental Engineering
基金
国家自然科学基金面上项目(42172286)。
关键词
平原岗地
水环境单元
地下水环境背景值
数理统计
plain area
water environment unit
groundwater environmental background value
mathematical statistics
