Accéder directement au contenu Accéder directement à la navigation
Article dans une revue

Numerical groundwater flow modeling for managing the Gabes Jeffara aquifer system (Tunisia) in relation with oasis ecosystems

Abstract : 8 The Gabes Jeffara aquifer system, in southeastern Tunisia, is essentially recharged by rainfall infiltration 9 and by groundwater inflow from the Intercalary Continental aquifer in the northwest. The increase in 10 groundwater pumping for irrigation in recent decades has induced a serious decrease in groundwater levels, 11 depletion of springs and degradation of oasis ecosystems. A multidisciplinary study was carried out to better 12 understand the behavior of oasis ecosystems and aquifer systems and to provide tools and recommendations 13 for water resources management. An important part of the study was devoted to developing a hydrodynamic 14 flow model of the Jeffara aquifer system, which can be used as a future groundwater management tool 15 considering different recharge or exploitation scenarios. This model was built with Processing Modflow, 16 gathering data on geology, hydrogeology, hydrology, rainfall, piezometry, withdrawals and spring flow 17 rates. The model was calibrated in steady state with reference to the piezometric levels measured in 1970 18 and in transient state for the period 1972-2014, using records from more than 200 wells and piezometers. 19 The analysis of current and future water consumption was carried out with existing data, processed satellite 20 images and farmer surveys. This analysis was used to define water demand scenarios combined with 21 scenarios of decreased groundwater withdrawal, reinforced groundwater recharge and use of alternative 22 water resources. The scenarios tested with the model show that the situation will be critical in less than 25 23 years without radical measures to reduce groundwater withdrawals by at least 60 MCM/y. 24 25
Type de document :
Article dans une revue
Liste complète des métadonnées

Littérature citée [63 références]  Voir  Masquer  Télécharger

https://hal-brgm.archives-ouvertes.fr/hal-02509375
Contributeur : Jean-François Vernoux <>
Soumis le : mardi 17 mars 2020 - 17:12:51
Dernière modification le : jeudi 19 mars 2020 - 01:13:12
Archivage à long terme le : : jeudi 18 juin 2020 - 12:53:41

Fichier

version_finale_avant_edition.p...
Fichiers produits par l'(les) auteur(s)

Identifiants

  • HAL Id : hal-02509375, version 1

Collections

Citation

Jean-François Vernoux, Faten Horriche, R Ghoudi. Numerical groundwater flow modeling for managing the Gabes Jeffara aquifer system (Tunisia) in relation with oasis ecosystems. Hydrogeology Journal, Springer Verlag, 2020. ⟨hal-02509375⟩

Partager

Métriques

Consultations de la notice

73

Téléchargements de fichiers

218