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A local-scale groundwater flow model for groundwater resources management in Dakhla Oasis, SW Egypt

Content Provider	Springer Nature Link
Author	Ebraheem, A. M. Riad, S. Wycisk, P. Sefelnasr, A. M.
Copyright Year	2004
Abstract	Dakhla Oasis is located in the Western Desert of Egypt. Groundwater exploited from the Nubian Sandstone aquifer is the only available water resource in this area. This resource has been heavily exploited since 1960, which has led to a substantial decline in the potentiometric surface of the aquifer. A regional numerical groundwater flow model, calibrated under unsteady-state conditions, has been developed and used to investigate the hydrodynamic impacts of different groundwater management options on the potentiometry of the aquifer. To account for local details and to allow a precise analysis of pumping and the resulting drawdown in Dakhla Oasis, a local-scale model was developed by refining the grid cells in the calibrated regional model. The local-scale model gave a detailed picture about the expected drawdown due to the different groundwater management options in the next 100 years. The simulated results indicated that the planned increase in groundwater extraction will have a major impact on groundwater flow patterns in the whole area located southwest of Dakhla Oasis.L’oasis de Dakhla est située dans la partie occidentale du désert d’Égypte. La seule source d’eau disponible dans la région provient de l’exploitation de l’aquifère gréseux de Nubian. Cette ressource a largement été exploitée depuis 1960, résultant en la diminution significative de la surface piézométrique de l’aquifère. Un modèle numérique d’écoulement régional de l’eau souterraine, calibré en régime transitoire, a été développé et utilisé afin d’étudier les impacts hydrodynamiques de différents scénarios de gestion de l’aquifère sur la surface piézométrique. Afin d’inclure les particularités locales et de réaliser une analyse précise du pompage et du rabattement qui y est associé dans l’Oasis de Dakhla, un modèle local d’écoulement a été développé en raffinant le maillage dans le modèle régional préalablement calibré. Le modèle local d’écoulement fournit une image détaillée du rabattement prévu pour les cent prochaines années selon les différents scénarios de gestion de l’aquifère. Les résultats obtenus par simulation numérique indiquent que l’augmentation prévue dans l’exploitation de l’eau souterraine aura un impact majeur sur les patrons d’écoulement de l’eau souterraine dans toute la région située au sud-ouest de l’oasis de Dakhla.El oasis Dakhla está situado en el gran desierto occidental de Egipto. El agua subterránea que se extrae del acuífero de roca arenosa nubia es la única fuente de agua disponible en esta área. Este recurso ha sido explotado en medida considerable desde 1960. Este hecho he causado una disminución sustancial en la superficie potenciométrica del acuífero. Se ha desarollado un modelo de flujo de agua subterránea numérico regional calibrado bajo condiciones de estado variable. Este modelo se ha utilizado para investigar el impacto hidrodinámico que diferentes opciones de manejo de aguas subterráneas tienen sobre la potenciometría del acuífero. Se desarolló un modelo de escala local mediante el refinamiento de las células de malla en el modelo regional calibrado con el objecto de involucrar los detalles locales y de permitir un análisis preciso del bombeo y disminución del nivel de aqua resultante en el oasis Dakhla. El modelo de escala local proporcionó un imagen detallada de la disminución de nivel esperada según las diferentes opciones de manejo de agua subterranea en los próximos 100 años. Los resultados simulados indican que el incremento de extración planificado en la agua subterránea tendrá un gran impacto en el patrón de flujo de agua subterranea en toda el area ubicada al suroeste del oasis de Dakhla.
Starting Page	714
Ending Page	722
Page Count	9
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	12
Issue Number	6
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2004-07-20
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nubian Sandstone aquifer Groundwater resources management Dakhla Oasis SW Egypt
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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