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为研究格尔木河山前平原区地下水水化学特征，并定量判断影响因子贡献率，于2020年9月采集地下水样品67个，运用数理统计、反距离权重插值法(IDW)、Durov图、Gibbs图、离子比值图、矿物饱和指数法、绝对因子分析-多元线性回归受体模型(APCS-MLR)等方法对格尔木河山前平原区地下水水化学特征及影响因子进行系统分析。结果表明：研究区地下水偏弱碱性，随地下水流程，水化学类型由HCO3·Cl-Ca·Mg、HCO3·SO4·Cl-Ca·Mg向Cl·SO4-Na·Mg型转化；地下水化学特征主要受蒸发结晶作用控制，部分水样点受蒸发结晶和岩石风化共同影响；地下水Na+、Ca2+、SO42-和Cl~-主要来源于蒸发盐岩(岩盐、石膏和芒硝)的溶解，Mg2+和HCO~-3主要来源于碳酸盐岩(方解石、白云石和文石)的风化溶解。蒸发盐岩对地下水水化学影响最大，达到60.83%,其次为碳酸盐岩和农业活动，贡献率为18.99%,含氟类矿物的贡献率为17.92%。研究成果能够为该区域地下水资源开发利用和饮水安全提供理论和技术支撑。
Abstract：In order to study the hydrochemical characteristics of groundwater in pre-hill plain of Golmud River and determine the contribution rate of influencing factors quantitatively, 67 groundwater samples were collected in September 2020. The mathematical statistics, inverse distance weight interpolation(IDW), Durov diagram, Gibbs diagram, ion ratio diagram, mineral saturation index method, absolute factor analysis-multiple linear regression receptor model(APCS-MLR) were applied. A systematic analysis of the groundwater hydrochemical characteristics and influencing factors in the pre-hill plain area of the Golmud River was carried out. The results showed that the groundwater in the study area was weakly alkaline, and the hydrochemical types changed from HCO3·Cl-Ca·Mg and HCO3·SO4·Cl-Ca·Mg to Cl·SO4-Na·Mg with the groundwater flow. The chemical characteristics of groundwater were mainly controlled by evaporation crystallization, and some water samples were affected by evaporation crystallization together with rock weathering. Na+, Ca2+, SO42- and Cl~- of groundwater were mainly derived from the dissolution of evaporative salt rocks(rock salt, gypsum and mirabite), while Mg2+ and HCO~-3 were mainly derived from the weathering dissolution of carbonate rocks(calcite, dolomite and aragonite). The evaporative rock had the greatest influence on groundwater hydrochemistry with 60.83%, followed by carbonate rock and agricultural activities with a contribution of 18.99% and fluoride minerals with a contribution of 17.92%. The research results provide important theoretical value and technical support for the development and utilization of groundwater resources and drinking water safety in the region.
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基本信息:
DOI：10.13928/j.cnki.wrahe.2022.11.013
中图分类号:P641.12
引用信息:
[1]陆丹,耿昭克,崔玉香,等.格尔木河山前平原区地下水水化学特征及影响因子定量研究[J],2022,53(11):131-145.DOI:10.13928/j.cnki.wrahe.2022.11.013.
基金信息:
国家自然科学基金项目(52200233);; 中国科协青年人才托举工程项目(2019QNRC001);; 中国博士后科学基金(2022M712470)