Abstract
This article presents an assessment of the groundwater resources in the Geba basin, Ethiopia. Hydrogeological characteristics are derived from a combination of GIS and field survey data. MODFLOW groundwater model in a PMWIN environment is used to simulate the movement and distribution of groundwater in the basin. Despite the limited data available, by simplifying the model as a single layered semi-confined groundwater system and by optimising the transmissivity of the different lithological units, a realistic description of the groundwater flow is obtained. It is concluded that 30,000 m3/day of groundwater can be abstracted from the Geba basin for irrigation in a sustainable way, in locations characterised by shallow groundwater in combination with aquitard-type lithological units.
Résumé
L’article présente une évaluation des ressources en eau du bassin de Geba en Ethiopie. Les caractéristiques hydrogéologiques sont établies à partir de données de terrain représentées sur SIG. Le modèle hydrogéologique Modflow est utilisé en environnement Pmwin afin de simuler les écoulements d’eau dans le bassin. Malgré le nombre limité de données disponibles, en simplifiant le modèle en un système aquifère stratifié semi-confiné et en optimisant les transmissivités des différentes unités lithologiques, une description réaliste des écoulements souterrains est obtenue. On conclut que 30 000 m3/j d’eau souterraine peuvent être extraits du bassin de Geba pour les besoins d’irrigation, de façon durable, en des zones caractérisées par des eaux souterraines peu profondes au sein d’unités lithologiques de type aquitard.
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Tesfagiorgis, K., Gebreyohannes, T., De Smedt, F. et al. Evaluation of groundwater resources in the Geba basin, Ethiopia. Bull Eng Geol Environ 70, 461–466 (2011). https://doi.org/10.1007/s10064-010-0338-3
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DOI: https://doi.org/10.1007/s10064-010-0338-3