Délimitation de biseau salé dans le bassin versant de Gareat el Tarf
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Date
2021
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Abbes Laghrour University- Khenchela
Abstract
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.