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Impact of the unsaturated zone in the hydrochemical and hydrodynamical functioning of karst aquifer: example of the Tlemcen Mountains, Northwest Algeria

  • H. Azzaz
  • C. Emblanch
  • B. S. Bekkoussa
  • A. Hamimed
  • A. Khaldi
Original Paper
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Abstract

The aim of this work is to understand the role of unsaturated zone on the functioning of karst aquifers. The easy infiltration of water into the system explains the expansion of karstification through the saturated zone. The unsaturated zone is largely involved in the flow on the overall karstic system. For this purpose, we use the environmental tracing, namely the calco-carbonic equilibrium elements (CO2, CO32−, HCO3, Ca2+, Mg2+), TOC, and isotopic elements (14C, 13C, and 3H) interesting tracers of residence time. Result obtained from TOC and Mg2+ enabled us to classify the behavior of systems to fissured type with a low average and restricted fluctuation of TOC concentrations and relatively high Mg2+ (inertial system). The second functioning type is characterized by a very high average and important variation of TOC with low contents of Mg2+ (perched system with fast infiltration). The values of 3H and 14C allow to distinguish three categories of water (old, mixture actual-old, and actual) with the predominance of actual waters. The comparison of the measured δ13C with those calculated shows that the majority of the karstic aquifers of Tlemcen Mountains are open systems with respect to the soil biogenic CO2. The piston flow in the unsaturated zone puts in charge the drains and stops drainage in the lower part of the system. The direct participation of infiltration is relatively low for all systems.

Keywords

Algeria Tlemcen Mountains Karst Unsaturated zone Hydrochemical Isotopes 

Notes

Acknowledgements

This study is part of the Ph.D. Thesis of Mr. Azzaz. H.; the authors would like to thank the National Agency of Hydraulic Resources (ANRH) staff for their help and acquisition of the data. We also thank the staff at the Laboratory of Hydrogeology (University of Avignon) for their continuing support and constructive comments. Finally, the authors wish to thank the reviewers for their helpful comments on this manuscript.

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Copyright information

© Saudi Society for Geosciences 2018

Authors and Affiliations

  • H. Azzaz
    • 1
  • C. Emblanch
    • 2
  • B. S. Bekkoussa
    • 1
  • A. Hamimed
    • 3
  • A. Khaldi
    • 3
  1. 1.Laboratoire des Sciences et Techniques de l’EauUniversity Mustapha Stambouli of MascaraMascaraAlgeria
  2. 2.Laboratoire d’HydrogéologieAvignon UniversityAvignonFrance
  3. 3.Laboratoire de Recherche sur les Systèmes Biologiques et la GéomatiqueUniversity Mustapha Stambouli of MascaraMascaraAlgeria

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