Délimitation de biseau salé dans le bassin versant de Gareat el Tarf

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Abbes Laghrour University- Khenchela
The watershed of Garaet El Tarf on which our study is based overlaps between two cities; Oum el Bouaghi and Khenchela (NE Algerian). This area is characterized by semi-arid climate and very heterogeneous sedimentary formations. The underground water is composed of a superposition of two groundwater; the mio-plioquaternary surface layer and the deep Cretaceous layer. The coupling between geological, hydrogeological and hydrogeochemical tools in the study of groundwater in the Garaat-el-Tarf plain, allowed us to determine the origin of the phenomenon of salinization and mineralization of the said locality. The results from these analyzes were processed using hydrochemical techniques (piper diagram) and using multivariate statistical analysis including Principal Component Analysis (PCA). Upstream of the basin and near the limestone outcrops, the waters are calcium bicarbonated, in the mio-plio-quaternary filling, the facies is calcium sulphate, to finally become sodium chloride on the borders of the sebkha. The water-rock interaction is the factor responsible for the mineralization of water. The chemical tracing by strontium suggests that the dissolution of evaporites and the sebkha-groundwater exchange contribute to the salinity of the waters of the Garaat-el-Tarf plain.