The plain of Tadjnanet Chelghoum Laid with agricultural vocation, is located in North East of Algeria where different water needs are covered by the shallow aquifer waters of the Mio-Pliocene-Quaternary. The overexploitation of the aquifer, resulting in falling average level of the water table and increased salinity of groundwater. Hydrochemical study using a feature reports and statistical tools such as principal component analysis and hierarchical clustering was performed using 33 water samples taken in wells. Chemical analyzes show that the waters are calcium bicarbonate type to the limits and calcium sulfated and sodium chloride at the center. The application of different tools has shown that the infiltration of precipitation water in karst aquifers on the limits where the waters acquire their original mineralization (carbonate) mineralize advantage of chlorides, sodium and sulfates in contact terrigenous salt formations of Mio-Pliocene-Quaternary. Salinization of water appears to be mainly due to the dissolution of gypsum, halite and epsomite. The application of hierarchical clustering and principal component analysis showed the existence of two groups with salinity increases in boundaries to the center of the plain with the flow.


Characterization, statistical, hydrochimical, shallow aquifer, Tadjnanet-Chelghoum Laid.

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