Approche hydrogéologique et hydrochimique des eaux souterraines dans une zone semi aride . Cas de la nappe mio-plio-quaternaire du synclinal de Djelfa (Algérie centrale )

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LARBI TBESSI-TEBESSA UNIVERSITY UNIVERSITE LARBI TEBESSI-TEBESSA

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Faculté des Sciences Exactes et Sciences
de la Nature et de la Vie
Département des Sciences de la Terre et
de l'Univers

Mémoire
Présenté en vue de l'obtention du diplôme de MAGISTER
en Hydrogéologie
Option : Impact de changement climatique sur les ressources hydriques
en Algérie

Par

RAHMANI Badreddine

(Ingénieur d'Etat en Hydrogéologie)

APPROCHE HYDROGEOLOGIQUE ET HYDROCHIMIQUE
DES EAUX SOUTERRAINES DANS UNE ZONE SEMI
ARIDE. CAS DE LA NAPPE MIO-PLIO-QUATERNAIRE DU
SYNCLINAL DE DJELFA

Date de soutenance:

DEVANT LE JURY

Mr HAMIMED Messaoud	MCA	Université de Tébessa	Président
Mr BAALI Fethi	Professeur	Université de Tébessa	Rapporteur
Mr MAOUI Amar	Professeur	Université de Guelma	Examinateur
Mr GOUAIDIA Layachi	MCA	Université de Tébessa	Examinateur

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ABSTRACT:

The zone study (Synclinal of Djelfa) belongs to the semi-arid zones, with precipitations 334mm. This zone includes the Mio-Plio-Quaternary aquifer, which plays an important role in the supply of irrigation water as well as drinking water for the region.

The objective of this work is the piezometric study as well as the hydrochemical studies of groundwaters of the Mio-Plio-Quaternary aquifer.

The obtained results of the piezometric study make it possible to highlight the general direction of flow towards the North-East with hydraulic gradients varying from 0.5 to 2 %.

In addition , the hydrochemical study reveals that the quasi totality of the studied water wells present calcic bicarbonated and calcic sulphated facies.

The examination of the iso-concentrations map representing the variation of the various physicochemical parameters; allows noting a high degree of mineralization at the North-West part and the far North-East of the studied area.

Finally, the study of the groundwater aptitude for the irrigation of the agricultural lands shows that the majority of the water wells have an acceptable quality for the irrigation, except for some areas in the North-West and the far North-East .

Key words: Synclinal of Djelfa , aquifer , piezometric , hydrochemistry , irrigation