Author:
Tenalem Ayenew Addis Ababa University Department of Geology and Geophysics P.O. Box 1176 Addis Ababa Ethiopia

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Abstract  

Environmental isotope (2H and 18O) techniques supported by hydrochemical surveying, water balance and conventional hydrogeological mapping were used to study the hydrogeological system of four major lakes located in a closed central Ethiopian rift basin. The focus of attention is the groundwater and surface water interaction and the subsurface hydraulic connection of the lakes. The result shows that despite their geographic proximity, the lakes have highly variable isotopic and hydrochemical signature owing to geological and geomorphological factors. Two of the lakes are alkaline and found to be terminal from both surface water and groundwater point of view. They are in the state of high evaporation with respect to present day precipitation. The groundwater flow converges from all sides of the basin and plays very important role in the water balance of all the lakes. Major flow system in the rift and the hydraulic connection of the lakes is strongly controlled by the direction and extent of the extensional normal faults.

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
Foundation
1968
Volumes
per Year
1
Issues
per Year
12
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)