Hydro-geochemical processes in the Complexe Terminal aquifer of southern Tunisia: An integrated investigation based on geochemical and multivariate statistical methods

Ammar, Friha Hadj; Chkir, Najiba; Zouari, Kamel; Hamelin, Bruno; Deschamps, Pierre; Aigoun, Aissa

doi:10.1016/j.jafrearsci.2014.06.015

Cited by 34 publications

(20 citation statements)

References 23 publications

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“…Multivariate statistical analysis has been extensively applied to analyze the complex hydrogeochemical processes taking place in the aquifer [15,17,20,26,27,35]. In this study, the PCA was chosen to analyze the hydrochemical dataset.…”

Section: Principal Component Analysis (Pca)mentioning

confidence: 99%

“…PCA is an efficient method to roughly identify the mechanisms with respect to groundwater chemical compositions [16,24]. In the PCA approach, the chemical parameters such as Na + , K + , Ca 2+ , Mg 2+ , Cl − , SO 4 2− , HCO 3 − , NO 3 − , TDS, and total hardness (TH) were firstly log transformed to improve symmetry, and z-standardization was used to reduce the variability [18,20,29]. T and pH were excluded from the analysis because there was a weak relationship between them and other parameters.…”

Section: Principal Component Analysis (Pca)mentioning

confidence: 99%

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Hydrogeochemistry of Shallow Groundwater in a Karst Aquifer System of Bijie City, Guizhou Province

Jiang

Deng

et al. 2017

Water

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Abstract:In this study, the major chemical compositions of 159 shallow groundwater samples incorporated saturation index (SI) and Principal Component Analysis (PCA) were employed to evaluate the mainly geochemical processes that control the hydrogeochemical evolution of groundwater in a typical karst area, Bijie city, Guizhou Province. The groundwater samples in this study area were dominated of HCO 3 -Ca, HCO 3 -Ca-Mg, and HCO 3 -SO 4 -Ca types. The PCA suggested that four principal components could explain 88.85% of the total variance of 10 parameters, indicating that the hydrogeochemical evolution of groundwater was mainly controlled by the dissolution/precipitation of carbonates, gypsum, and halite minerals, cation exchange, and anthropogenic activities. To be specific, the enrichment of Ca 2+ , Mg 2+ , HCO 3 − and SO 4 2− in groundwater were primarily affected by the dissolution of dolomite and gypsum minerals, and the role of calcite dissolution was relatively weaker because most groundwater samples were saturated with respect to calcite. Besides, cation exchange was another factor that may affect the concentration of Ca 2+ and Mg 2+ in groundwater, and the concentration of SO 4 2− can also be influenced by coal mining activity. In addition, the concentrations of Na + and Cl − in groundwater were likely influenced by the dissolution of halite, cation exchange, and human activities.

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Section: Principal Component Analysis (Pca)mentioning

confidence: 99%

Section: Principal Component Analysis (Pca)mentioning

confidence: 99%

Hydrogeochemistry of Shallow Groundwater in a Karst Aquifer System of Bijie City, Guizhou Province

Jiang

Deng

et al. 2017

Water

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“…The Chloro-Alkaline Indices CAI [21] are calculated to quantify the process of Base Exchange reaction. The evolution of geochemical processes in groundwater depends on the equilibrium between mineral phases and water and is commonly discussed by saturation indices [22,23]. The Saturation Indice (SI) is evaluated to interpret groundwater hydrochemistry, using software PHREEQC [24,25].…”

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confidence: 99%

Groundwater Quality and Suitability for Different Uses in the Saloum Area of Senegal

Ndoye

Fontaine

Gaye

et al. 2018

Water

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Hydrogeochemical analyses were conducted on groundwater sampled from the Saloum aquifer, in southern Senegal. The objective was to identify the chemical processes that control hydrochemistry and to assess the quality of groundwater for determining its suitability for drinking and agricultural purposes. Water samples were collected from 79 wells during the dry season in May 2012, and were subjected to analysis for chemical characteristics (major ions), pH, electrical conductivity (EC) and total dissolved solid (TDS). The dominant hydrochemical facies observed for the groundwater samples are NaCl and CaHCO3. Gibbs plot depicts predominance of rock water interaction and evaporation processes controlling the water chemistry. Percentage of Na+, Residual Sodium Carbonate (RSC), Total Hardness (TH) and Sodium Adsorption Ratio (SAR) values were calculated. The results were compared with the standard guideline values recommended by the World Health Organization and agricultural water standards. The TDS in groundwater is less than 1200 mg/L and SAR values are less than 10. RSC values overall are less than 1.25 meq/L. Results show that the groundwater in the area has generally a low hardness and is fresh (95%) to brackish. The majority of groundwater samples are appropriate for domestic uses. The indexes for water irrigation compared with standard limits revealed that most of the Saloum groundwater samples fall in the suitable range for irrigation.

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“…This is due to both gypsum dissolution and calcite precipitation. Chlorides in groundwater may come from three different sources: (i) ancient sea water entrapped in sediments, (ii) dissolution of halite and related minerals that are present in evaporite deposits and (iii) dissolution of dry fallout from the atmosphere, particularly in these arid regions (Matiatos et al, 2014;Hadj-Ammar et al, 2014).…”

Section: Change Of Facies From the Carbonated Cluster To The Evaporites' Clustermentioning

confidence: 99%

Geochemical inverse modeling of chemical and isotopic data from groundwaters in Sahara (Ouargla basin, Algeria)

Slimani¹,

Guendouz²,

Trolard³

et al. 2016

Preprint

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Abstract. New samples were collected in the three major Saharan aquifers namely, the “Continental Intercalaire” (CI), the “Complexe Terminal” (CT) and the Phreatic aquifer (Phr) and completed with unpublished more ancient chemical and isotopic data. Instead of classical Debye-Hückel extended law, Specific Interaction Theory (SIT) model, recently incorporated in Phreeqc 3.0 was used. Inverse modeling of hydro chemical data constrained by isotopic data was used here to quantitatively assess the influence of geochemical processes: at depth, the dissolution of salts from the geological formations during upward leakage without evaporation explains the tran sitions from CI to CT and to a first pole of Phr (pole I); near the surface, the dissolution of salts from sebkhas by rainwater explains another pole of Phr (pole II). In every case, secondary precipitation of calcite occurs during dissolution. All Phr waters result from the mixing of these two poles together with calcite precipitation and ion exchange processes. These processes are quantitatively assessed by Phreeqc model. Globally, gypsum dissolution and calcite precipitation were found to act as a carbon sink.

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Hydro-geochemical processes in the Complexe Terminal aquifer of southern Tunisia: An integrated investigation based on geochemical and multivariate statistical methods

Cited by 34 publications

References 23 publications

Hydrogeochemistry of Shallow Groundwater in a Karst Aquifer System of Bijie City, Guizhou Province

Hydrogeochemistry of Shallow Groundwater in a Karst Aquifer System of Bijie City, Guizhou Province

Groundwater Quality and Suitability for Different Uses in the Saloum Area of Senegal

Geochemical inverse modeling of chemical and isotopic data from groundwaters in Sahara (Ouargla basin, Algeria)

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