Groundwater origin and flow along selected transects in Ethiopian rift volcanic aquifers
| Autor: | Seifu Kebede, Zenaw Tessema, Asfawossen Asrat, Yves Travi, Tamiru Alemayehu, Tenalem Ayenew |
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| Přispěvatelé: | Addis Ababa University (AAU), Environnement Méditerranéen et Modélisation des Agro-Hydrosystèmes (EMMAH), Avignon Université (AU)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Geological Survey |
| Rok vydání: | 2007 |
| Předmět: |
STABLE ISOTOPE
Groundwater flow [SDV]Life Sciences [q-bio] ETHIOPIA 0207 environmental engineering Geochemistry Aquifer HYDROCHEMISTRY 02 engineering and technology 010502 geochemistry & geophysics 01 natural sciences EAST-AFRICA Earth and Planetary Sciences (miscellaneous) 020701 environmental engineering Geomorphology 0105 earth and related environmental sciences Water Science and Technology geography geography.geographical_feature_category Rift Plateau Groundwater recharge 6. Clean water Graben GEOCHIMIE RIFT [SDE]Environmental Sciences RECHARGE VOLCANIC AQUIFER GEOCHEMISTRY Geology Rift valley Groundwater |
| Zdroj: | Hydrogeology Journal Hydrogeology Journal, Springer Verlag, 2008, 16 (1), pp.55-73. ⟨10.1007/s10040-007-0210-0⟩ |
| ISSN: | 1435-0157 1431-2174 |
| DOI: | 10.1007/s10040-007-0210-0 |
| Popis: | International audience; The disruption of lithologies by cross-cutting faults and the variability in volcanic structures make the hydrogeology of the rifted volcanic terrain in Ethiopia very complex. Along two transects, selected due to their hydrogeologic characteristics, groundwater flow, depth of circulation and geochemical evolution have been conceptualized. The groundwater flow continuity between the high rainfall plateau bounding the rift and the rift valley aquifers depends principally on the nature of the bounding faults. Up to 50% of recharge to the rift aquifers comes from the plateau as groundwater inflow where the rift is cross cut by transverse fault zones. Recharge from the mountains is found to be insignificant where the rift is bounded by marginal grabens; channel loss and local precipitation are the principal sources of recharge to the rift aquifers in such cases. At a regional scale, there is a clear zonation in the geochemical compositions of groundwaters, the result of aquifer matrix composition differences. The environmental isotope results show that the majority of the aquifers contain modern groundwaters. In a few localities, particularly in thermal groundwaters representing deeper circulation, palaeo-groundwaters have been identified. Deeper groundwaters in the rift floor have a uniform C-14 age ranging between 2,300 and 3,000 years. |
| Databáze: | OpenAIRE |
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