STATISTICAL AND HYDROCHEMICAL CLASSIFICATION OF UNDERGROUND WATERS IN A MULTI-LAYER AQUIFER SYSTEM IN AN ARID ZONE :APPLICATION TO CHOTT EL GHARBI BASIN (EXTREME WEST OF ALGERIA)
DOI:
https://doi.org/10.4314/jfas.v11i2.16Keywords:
Key words: Chott El Gharbi; multilayer; system hydro-geochemical; analyzes statistical study, saturation index.Abstract
The studied area, so called Chott El Gharbi shelters a multilayer aquifer system. The hydro-chemical tool shows that the results of the groundwater analyzes of the aquifer system of the Chott El Gharbi region revealed that they are sulphated-calcium and magnesian. Water infiltrated at the Bajo-Bathonian and Mio-Plio-Quaternary carbonate formations is enriched with HCO3- and SiO2 along its underground route. Also, the presence of a Triassic evaporitic formation or the Cenomano- Turonian argilo-gypsum formation enriches these waters with SO42-, Cl-, K +, Mg2 +, Na + and Ca2 +.
Thermodynamics has shown that these waters are under saturated evaporitic elements, which gives them a greater power of dissolution than that of carbonates which are in equilibrium or sometimes even supersaturated and tend to precipitate.
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