摘要
为了遏制民勤生态环境恶化的趋势,促进石羊河流域经济社会的可持续发展,当地政府2001年和2006年分别开始实施了关井压田节水措施和石羊河下游放水工程.以此为背景,于2008年采集65个民勤地下水水样,对地下水中的主要离子含量进行测试分析,利用传统的统计学分析方法研究了地下水的水化学特征.结果表明,民勤地下水中SO42-、Cl-、HCO3-、CO32-、Na+、Mg2+、Ca2+和K+浓度分别为(921±1 042)(、241±211)(、282±123)、(4.7±11.7)(、468±599)、(156±166)(、142±89)和(17.6±34.5)mg/L,沿地下水水流方向,它们的浓度均呈现增加的趋势.2008年民勤地下水矿化度为(2.2±1.9)g/L;地下水的类型主要属于SO42--Cl--Na+-Mg2+型水.地下水中NO3-的平均浓度为(8.1±9.9)mg/L,有1.54%的水样中硝态氮含量超过了国家一级饮用水标准.结合2002年和2005年同期的矿化度资料,利用地统计学方法,对民勤2002年以来矿化度的时空变异规律进行了研究.矿化度的Kringing插值结果表明,在空间分布上,矿化度呈从南到北逐渐升高的格局;在时间变化上,对南部区域,2005年矿化度较2002年有所上升,2008年较2005年有所下降;北部区域变化情况则相反.单一的节水措施对地下水没有明显改善作用,石羊河放水加大了红崖山水库的储水量,对民勤地下水有较好的改善作用.
In order to curb the deterioration of ecological environment and promote the economic and social sustainable development of Shiyang River Basin,the Minqin government implemented water-saving measures of the shut-in and pressure fields and water discharge engineering in Shiyang River downstream in 2001 and in 2006,respectively.Sixtyfive groundwater samples were collected in Minqin County in 2008 and the concentrations of major ions were analyzed in laboratory.The hydrochemistry characteristic of the groundwater was studied by traditional statistical analysis method.Results indicated the concentrations of the major ions,such as SO4^2-,Cl^-,HCO3^-,CO3^2-,Na^＋,Mg^2＋,Ca^2＋ and K＋in the groundwater samples,were（921±1.042））,（241±211）,（282±123）,（4.7±11.7）,（468±599）,（156±166）,（142±89） and（17.6±34.5）mg/L,respectively.There was increasing tendency for major ion concentrations along the groundwater flow direction.The groundwater mineralization was（2.2±1.9）g/L in 2008.The type of water samples in Minqin oasis mainly belonged to SO4^2-Cl^--Na^＋-Mg^2＋.The average concentration of the NO3^- was（8.1±9.9）mg/L in the groundwater of Minqin,and the nitrate-N content was over 10mg/L in 1.54% of all of water samples,which was unsuitable for drinking.Based on the data of groundwater mineralization in 2002,2005 and 2008,the spatial-temporal variations of groundwater mineralization were studied by geo-statistical analysis method. Kringing interpolation results showed that groundwater mineralization at the spatial distribution scale were took on a gradual increase pattern from south to north.As for the change trend of groundwater mineralization in south area of Minqin County,there was increasing trend from 2002 to 2005,but decreasing trend was occurred from 2005 to 2008.Change trend of groundwater mineralization in north area of Minqin oasis was opposite to that of in south area.There was decreasing trend for the groundwater mineralization in south area from 2005 to 2008,which was due to the impact on water discharge in Shiyang River Basin.There was no significant improvement for groundwater by single water-saving measure,but the quality of groundwater was improved after water discharge in Shiyang River Basin.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2009年第10期2911-2917,共7页
Environmental Science
基金
国家科技支撑计划项目(2007BAD46B06)
国家自然科学基金项目(30670375)
关键词
地下水
水文化学
矿化度
地统计学
民勤县
groundwater
hydrochemistry
mineralization
geostatistics
Minqin County
