Use of hydrochemistry and environmental isotopes for assessment of groundwater resources in the intermediate aquifer of the Sfax basin (Southern Tunisia)
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- 作者：Zohra Hchaichi (1)
Kamel Abid (1)
Kamel Zouari (1) - 关键词：Tunisia ; Hydrogeochemical ; Dissolution ; Cation exchange ; Evaporation
- 刊名：Carbonates and Evaporites
- 出版年：2014
- 出版时间：June 2014
- 年：2014
- 卷：29
- 期：2
- 页码：177-192
- 全文大小：
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Kamel Abid (1)
Kamel Zouari (1)
1. école Nationale d’Ingénieurs de Sfax, BP 1173, 3038, Sfax, Tunisia - ISSN：1878-5212
文摘
Groundwaters from the intermediate aquifer of Sfax basin have been investigated using chemical tracers and environmental isotopes to reveal the hydrogeological features of this system and characterize the dynamics of groundwater salinization in this sector. The origin of salinity in the studied aquifer was investigated based on the chemical analyses of 30 groundwater samples. Groundwater is characterized by Na–Cl and Na–SO4 water types. The saturation indices for calcite and gypsum, and binary diagrams of different ions showed that the main hydrogeochemical processes were the dissolution of carbonates (mainly calcite scattered through the reservoir rocks), the dissolution of evaporites (halite, gypsum and anhydrite) and the cation exchange processes. The isotopic composition investigation allowed the definition of two groups. The first group is represented by groundwater with the highest oxygen-18 content (δ18O ranges between ?.36 and ?.22?- and δ2H ranges between ?9.2 and ?6?-. The high δ18O values in this group can be attributed to the evaporation effect. The second group includes the most depleted waters (δ18O varies between ?.84 and ?.79?- and δ2H varies between ?2.4 and ?6.5?-. The combined analyses of stable isotopes and major ions (Cl?/sup>) showed that mixing between old and recent water and evaporation were the main processes explaining the variation of salinity of the intermediate aquifer of the Sfax basin.