Geochemical evolution of groundwater in an alluvial aquifer: Case of El Eulma aquifer, East Algeria

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• 作者：Lazhar Belkhiri^a ; ^{BELKHIRI_Laz@yahoo.fr} ; Lotfi Mouni^b ; Abderrahmane Boudoukha^c
• 关键词：Groundwater ; Cluster analysis ; Geochemical modeling ; PHREEQC ; El Eulma Mio-Plio-Quaternary aquifer ; Algeria
• 刊名：Journal of African Earth Sciences
• 出版年：2012
• 期刊代码：4_1464343X
• 类别：ear
• 出版时间：15 May, 2012
• 卷：66-67
• 期：Complete
• 页码：46-55
• 文件大小：1362 K

摘要

Hydrochemical, multivariate statistical and inverse hydrogeochemical modeling techniques were used to determine the main factors and mechanisms controlling the chemistry of groundwaters in the El Eulma Mio-Plio-Quaternary aquifer, East Algeria. Cluster analysis based on major ion contents defined three main chemical water types, reflecting different hydrochemical processes. The first, group 1, has low salinity (mean EC = 937 渭S/cm) and abundance orders Ca²⁺ > Na⁺ 鈮?#xA0;Mg²⁺ > K⁺ and . With increased water-rock interaction, waters in groups 2 and 3 become more saline, changing composition towards Cl-HCO₃-Ca and Cl-Ca-Na types. The PHREEQC geochemical modeling demonstrated that relatively few phases are required to derive water chemistry in the area. In a broad sense, the reactions responsible for the hydrochemical evolution in the area fall into three categories: (1) dissolution of evaporite minerals; (2) precipitation of carbonate minerals, quartz, kaolinite and Ca-smectite; (3) ion exchange.