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Increased frequency of flash floods in Dire Dawa, Ethiopia: change in rainfall intensity or human impact?

Billi, Paolo, Tedesse, Yonas and Ciampalini, Rossano 2015. Increased frequency of flash floods in Dire Dawa, Ethiopia: change in rainfall intensity or human impact? Natural Hazards 76 (2) , pp. 1373-1394. 10.1007/s11069-014-1554-0

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Abstract

In the last decade, Ethiopia has been subjected to an increased frequency of flash floods, especially in the town of Dire Dawa. The results of International Organisations studies point to no evidence of a climate-driven change in the magnitude/frequency of floods, though increases in runoff and risk of floods in East Africa are expected. Since few studies of African climate have considered the temporal variations of daily rainfall and the relationship between rainfall intensity, land use change and flash floods in Ethiopia, this study analyses the recent trends of rainfall intensity across Ethiopia in order to ascertain if the increased frequency of flash floods is paralleled by an increase of daily precipitation. Secondly, the relative role of rainfall intensity and land use change in augmenting the frequency of flash floods is investigated in the Dechatu River flowing through the town of Dire Dawa. Results indicate that the increase in rainfall intensity is larger than the increase in runoff generated by land use change with the former being likely the more important factor in controlling the increased frequency of flash flood in Dire Dawa.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Subjects: G Geography. Anthropology. Recreation > GB Physical geography
Uncontrolled Keywords: Flash flood, rainfall intensity, climate change, land use change, Ethiopia.
Publisher: Springer Verlag
ISSN: 0921-030X
Date of Acceptance: 8 December 2014
Last Modified: 12 Mar 2019 12:21
URI: http://orca.cf.ac.uk/id/eprint/67906

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