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Hydrogeology Journal

, Volume 14, Issue 5, pp 729–741 | Cite as

Groundwater study using remote sensing and geographic information systems (GIS) in the central highlands of Eritrea

  • Semere SolomonEmail author
  • Friedrich Quiel
Report

Abstract

Remote sensing, evaluation of digital elevation models (DEM), geographic information systems (GIS) and fieldwork techniques were combined to study the groundwater conditions in Eritrea. Remote sensing data were interpreted to produce lithological and lineament maps. DEM was used for lineament and geomorphologic mapping. Field studies permitted the study of structures and correlated them with lineament interpretations. Hydrogeological setting of springs and wells were investigated in the field, from well logs and pumping test data. All thematic layers were integrated and analysed in a GIS. Results show that groundwater occurrence is controlled by lithology, structures and landforms. Highest yields occur in basaltic rocks and are due to primary and secondary porosities. High yielding wells and springs are often related to large lineaments, lineament intersections and corresponding structural features. In metamorphic and igneous intrusive rocks with rugged landforms, groundwater occurs mainly in drainage channels with valley fill deposits. Zones of very good groundwater potential are characteristic for basaltic layers overlying lateritized crystalline rocks, flat topography with dense lineaments and structurally controlled drainage channels with valley fill deposits. The overall results demonstrate that the use of remote sensing and GIS provide potentially powerful tools to study groundwater resources and design a suitable exploration plan.

Keywords

Remote sensing Geographic information systems Digital elevation model Eritrea 

Résumé

Télédétection, évaluation de modèles numériques de terrain (MNT), systèmes d’informations géographiques (SIG) et techniques de terrain ont été combinées pour étudier les eaux souterraines en Eritré. Les données de télédétection ont été interprétées pour la réalisation d’une carte lithologique et d’une carte des linéaments. Le MNT a été utilisé pour la cartographie des linéaments et de la géomorphologie. Les études de terrain ont permit d’étudier les structures et de les corréler avec l’interprétation des linéaments. Les sources et les puits ont été investigués sur le terrain, ainsi qu’à partir de log et d’essais de pompages. Toutes les couvertures thématiques ont été intégrées et analysées dans un SIG. Les résultats montrent que l’occurrence de l’eau souterraine est contrôlée par la lithologie, les structures et la forme des paysages. Les meilleurs débits se trouvent dans les roches basaltiques et sont dus aux porosités primaires et secondaires. Les puits et les sources possédant les meilleurs débits sont en relation avec les grands linéaments, les intersections de linéaments et leurs structures correspondantes. Dans les roches métamorphiques, intrusives et ignées, sous des paysages forts accidentés, l’eau souterraine apparaît essentiellement dans les chenaux de drainage des dépôts de fonds de vallée. Les zones présentant un excellent potentiel d’eau souterraine, sont caractéristiques des couches basaltiques recouvrant les roches cristallines latéritiques, les zones plates possédant un réseau dense de linéaments et structuralement contrôlées par les chenaux de drainage avec des dépôts de fond de vallée. Le résultat global démontre que l’utilisation de la télédétection et des SIGs procure des outils potentiellement puissants pour l’étude des ressources en eau souterraine et pour le montage de plans d’exploration convenables.

Resumen

Se combinó el uso de sensores remotos, la evaluación de modelos de elevación digitales (MED), sistemas de información geográfico (SIG), y técnicas de trabajo de campo para estudiar las condiciones del agua subterránea en Eritrea. Se interpretaron los datos de sensores remotos para producir mapas de lineamientos y litológicos. Los MED se usaron para el mapeo geomorfológico y de lineamientos. Los estudios de campo permitieron estudiar las estructuras y correlacionarlas con interpretaciones de lineamientos. Se investigó el marco hidrogeológico de manantiales y pozos en el campo a partir de registros de pozos y datos de pruebas de bombeo. Todas las capas temáticas se integraron y analizaron en un SIG. Los resultados muestran que la presencia de agua subterránea es controlada por litología, estructuras, y paisajes. Los rendimientos más altos ocurren en rocas basálticas y se deben a porosidades primarias y secundarias. Los pozos con altos rendimientos frecuentemente están relacionados con lineamientos grandes, intersecciones de lineamientos y sus características estructurales correspondientes. En rocas ígneas intrusivas y metamórficas con paisajes accidentados, el agua subterránea ocurre principalmente en canales de drenaje con depósitos de relleno en valles. Zonas con muy buen potencial de agua subterránea son características de capas basálticas que sobreyacen rocas cristalinas lateritizadas, topografía plana con lineamientos densos, y canales de drenaje con control estructural con depósitos de relleno de valle. Los resultados globales demuestran que el uso de sensores remotos y SIG aportan herramientas potencialmente poderosas para estudiar los recursos de agua subterránea y diseñar un plan exploratorio apropiado.

Notes

Acknowledgements

This study was supported financially by the Swedish International Development Agency (SIDA) in the framework of cooperation between Uppsala University, The Royal Institute of Technology, Stockholm, Sweden and the University of Asmara, Eritrea. Special thanks go to the Water Resources Department in Eritrea for providing all types of data and Dr. S. Drury for facilitating the availability of the Landsat TM data. We are grateful to the University of Asmara, for arranging field visits for data collection

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  1. 1.Environmental and Natural Resources Information SystemsThe Royal Institute of TechnologyStockholmSweden

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