Spatial and temporal variability of river flows in the degraded semi-arid tropical mountains of northern Ethiopia

[en] Water availability has for long been a critical issue in many developing countries. Despite its enormous potential of water resources, Ethiopia is suffering from a lack of water availability and threatened by the consequences of climate change. Well-considered planning to develop these resources is crucial. However, very few observational runoff data exist for this type of environments. Especially runoff data for catchments at the intermediate scale (100- 10,000 km2) are lacking. This study assesses the runoff from 10 medium-sized catchments in the Geba river basin, a subcatchment of the Nile in the semi-arid degraded northern Ethiopian highlands. Flow depth records were automatically obtained every 10 minutes during the rainy seasons (July-September) of 2004-2007 and converted to continuous runoff discharge records. Cumulative annual runoff depths (46-395 mm) are mainly correlated with rainfall depth. Estimated runoff coefficients (9-47%) and are negatively correlated with the areal fraction of limestone outcrops in the catchments, indicating runoff transmission losses. Throughout the rainy season, increases in runoff depth and runoff coefficient were observed, which is partly attributed to an increase in baseflow throughout the season. The majority of the runoff occurs during flash floods, i. e. relatively short runoff events with often very high peak discharges. Characteristics of these floods are discussed with some examples, including an exceptionally large flood. Taking into account the difficult conditions for river discharge measurements, this study provides one of the most comprehensive analyses so far of the magnitude and dynamics of river discharges in Ethiopia. © 2012 Gebr. Borntraeger Verlagsbuchhandlung, Stuttgart, Germany.

Disciplines :

Earth sciences & physical geography

Author, co-author :

Zenebe, A.; Department of Land Resources Management and Environmental Protection, Mekelle University, PO Box 231, Mekelle, Ethiopia

Vanmaercke, Matthias ; Université de Liège > Département de géographie > Géographie physique et du quaternaire

Poesen, J.

Verstraeten, G.; Department of Earth and Environmental Sciences, K.U. Leuven, Celestijnenlaan 200E, B-3001 Heverlee, Belgium, Fund for Scientific Research-Flanders, Belgium

Haregeweyn, N.; Department of Land Resources Management and Environmental Protection, Mekelle University, PO Box 231, Mekelle, Ethiopia

Haile, M.; Department of Land Resources Management and Environmental Protection, Mekelle University, PO Box 231, Mekelle, Ethiopia

Amare, K.; Department of Applied Geology, Mekelle University, PO Box 231, Mekelle, Ethiopia

Deckers, J.; Department of Earth and Environmental Sciences, K.U. Leuven, Celestijnenlaan 200E, B-3001 Heverlee, Belgium, Fund for Scientific Research-Flanders, Belgium

Nyssen, J.; Department of Geography, Ghent University, Krijgslaan 281(S8), B-9000 Gent, Belgium

Title :

Spatial and temporal variability of river flows in the degraded semi-arid tropical mountains of northern Ethiopia

Publication date :

2013

Journal title :

Zeitschrift für Geomorphologie

ISSN :

0372-8854

Publisher :

E. Schweizerbart Science Publishers, Stuttgart, Germany

Volume :

Issue :

Pages :

143-169

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 28 March 2017

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