Contribution Of Hydrogeochemical And Statistic Tools To The Acquisition Of Water Quality In The North-Eastern Of Algeria: Annaba-El Tarf

Abstract

This work was conducted on 34 samples spread over 4 areas (Bouteldja, El Tarf, Les Salines et Barrahal) tapping the shallow and deep aquifer of groundwater in the North-eastern Algeria (Annaba-El Tarf), one sampling campaign was conducted in 2017 to describe the chemistry of the water and its interaction with the rock. The interpretation of the geological-geophysical and hydrogeological data allowed us to highlight two principal aquifers. The first consists of the sandy clay formations up to 18 m thick. It is generally free except at a few points where it is captive under clay levels. The second is more important localized in the gravel layer below first aquifer; it covers the entire study area. It is formed by Plio-Quaternary gravels, sands and pebbles and is contained in the collapse basin. The methodology used for the processing of the analysis results is based on multivariate statistical methods and characteristic ratios coupled with hydrochemical methods, as well as the calculation of saturation indices. The results show that the water quality is controlled both by the dissolution of the minerals of the evaporite formations and those of the carbonate formations, alteration of silicates and marine invasion.