Origin and Quality of Groundwater of the Taoura Syncline Aquifer in North-Eastern of Algeria
The water quality of aquifer is conditioned by geological formations crossed by water during its flow. So water crossing calcareous rocks becomes rich in bicarbonates; also water crossing saliferous rocks becomes rich of sulphates or chlorides. This affir
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Contents 1 Introduction 2 Geological and Hydrogeological of the Study Area 2.1 Geological and Structural Features 2.2 Hydrogeological Features 3 Materials and Methods 4 Results and Discussions 4.1 Hydrochemical Types 4.2 Principal Component Analysis 4.3 Cross-Plot Analysis 4.4 The Base Exchange Index (BEI) and Saturation Indices (SI) 5 Neuronal Model Contributions
L. Djabri (*), A. Hani, and H. Chaffai Water Resource & Sustainable Development Laboratory, University of Badji Mokhtar Annaba, Annaba, Algeria e-mail: [email protected] S. Bouhsina Unit of Environmental Chemistry and Interactions on the Living (UCEIV), University of the Littoral Opal Coast, Dunkerque, France e-mail: [email protected] F. Z. Trabelsi Higher School of Engineers of Medjez El-Bab, University of Jendoub, Jendouba, Tunisia e-mail: [email protected] F. Rouaibia University of Constantine, Constantine, Algeria e-mail: [email protected] A. Bouderbala Department of Earth Sciences, University of Khemis Miliana, Khemis Miliana, Algeria e-mail: [email protected] Abdelazim Negm, Abdelkader Bouderbala, Haroun Chenchouni, and Damia Barcelo (eds.), Water Resources in Algeria - Part I: Assessment of Surface and Groundwater Resources, Hdb Env Chem, DOI 10.1007/698_2020_523, © Springer Nature Switzerland AG 2020
L. Djabri et al. 6 Conclusions 7 Recommendations References
Abstract The water quality of aquifer is conditioned by geological formations crossed by water during its flow. So water crossing calcareous rocks becomes rich in bicarbonates; also water crossing saliferous rocks becomes rich of sulphates or chlorides. This affirmation can be applied to water of the karst aquifer of Taoura. The recharge of this aquifer comes from rainfall or by water of different draining zones of the watershed cross-border of Medjerda-Mellegue in south part of the city of Souk Ahras. The geological studies showed that the outcrop formations in the syncline contain groundwater in low level, which make the aquifer captive. This last is exploited by several wells (T1, T3, T7, D3, D5). The observation of stratigraphic logs shows a lithological heterogeneity of the aquifer, which is going to explain the variation of its hydrochemical composition. Samples and analysis carried out showed that groundwater of this aquifer is rich in calcium and bicarbonate; however some wells are characterized by the domination of chlorides and sulphates; these anions are accompanied by sodium or by calcium. So, the impact of geological rocks crossed by water is important on the characterization of groundwater quality. Also, the risks of pollution in unconfined parts of the aquifer are quasi unavoidable, and they are confirmed by concentration of nitrates >50 mg/l. Keywords Algeria, Hydrochemical characterization, Taoura syncline, Water quality
1 Introduction The syncline of Taoura occupies a subbasin of 826 km2. It is located on the AlgerianTunisian border, in the southeast of Souk Ahras. The Taoura region includes several aquifers as well as many cold springs and fe
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