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Hydrogeology Journal

, Volume 12, Issue 6, pp 698–713 | Cite as

A very large scale GIS-based groundwater flow model for the Nubian sandstone aquifer in Eastern Sahara (Egypt, northern Sudan and eastern Libya)

  • W. Gossel
  • A. M. Ebraheem
  • P. Wycisk
Report

Abstract

A three-dimensional GIS-based groundwater flow model for the Nubian Sandstone Aquifer in the eastern Sahara was developed and calibrated under steady-state and transient conditions. The model was used to simulate the response of the aquifer to climatic changes that occurred during the last 25,000 years. The simulation results indicated that the groundwater in this aquifer was formed by infiltration during the wet periods 20,000 and 5,000 years b.p. The recharge of groundwater due to regional groundwater flow from more humid areas in the south was excluded. It also indicates that the Nubian Aquifer System is a fossil aquifer, which had been in an unsteady state condition for the last 3,000 years.

Keywords

Groundwater exploration Groundwater management Numerical modeling Arid regions Nubian sandstone Egypt 

Résumé

Pour l’aquifère gréseux Nubien de Sahara -Est on a mis au points un modèle tridimensionnel, basé sur GIS. Le modèle a été calibré tant pour l’écoulement stationnaire que pour l’écoulement transitoire. On a simulé après la réponse de l’aquifère aux changements climatiques des derniers 25000 ans. Les résultats des simulations indiquent que la nappe a été rechargée par des infiltrations pendant une période humide qui s’étend 5000 et 20000 ans, dès temps actuel. On n’a pas pris en compte la recharge de l’aquifère par la zone plus humide située dans sa partie sud. Le modèle indique aussi que l’eau de l’aquifère Nubien est une eau fossile qui a eu un écoulement transitoire pendant les derniers 3000 ans.

Resumen

Fue desarrollado un modelo de flujo de agua subterránea en tres dimensiones, basado en un SIG, para el Acuífero Arenisca Nubian en el Sahara Oriental, el cual fue calibrado para condiciones de estado estacionario y transitorio. El modelo se usó para simular la respuesta del acuífero a los cambios climáticos que ocurrieron durante los últimos 25000 años. Los resultados de esta simulación indicaron que el agua subterránea en este acuífero, se formó por infiltración, durante los períodos húmedos que hubo hace 20000 y 5000 años, antes del presente. Fue excluida la recarga del acuífero debida a un flujo regional de agua subterránea proveniente de áreas con un clima más húmedo en el sur. El modelo también muestra, que el Sistema Acuífero Nubian es un acuífero fósil, el cual ha permanecido en una condición de estado no estacionario, durante los últimos tres mil años.

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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  1. 1.Geology DepartmentMartin-Luther UniversityHalleGermany
  2. 2.Geology DepartmentAssiut UniversityAssiutEgypt

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