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

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• 作者：Paolo Billi (1)
  Yonas Tadesse Alemu (2)
  Rossano Ciampalini (3)
  
  1. Dipartimento di Fisica e Scienze della Terra ; Universit脿 di Ferrara ; Via G. Saragat 1 ; 44122 ; Ferrara ; Italy
  2. Department of Geography ; University of Dire Dawa ; P.O. Box 1362 ; Dire Dawa ; Ethiopia
  3. School of Earth and Ocean Sciences ; University of Cardiff ; Park Place ; Cardiff ; CF10 3AT ; UK
  
• 关键词：Flash flood ; Rainfall intensity ; Climate change ; Land use change ; Ethiopia
• 刊名：Natural Hazards
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：76
• 期：2
• 页码：1373-1394
• 全文大小：1,316 KB
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• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Hydrogeology
  Geophysics and Geodesy
  Geotechnical Engineering
  Civil Engineering
  Environmental Management
  
• 出版者：Springer Netherlands
• ISSN：1573-0840

文摘

In the first decade of the twenty-first century, Ethiopia has been subjected to an increased frequency of flash floods, especially in the town of Dire Dawa. The results of international organizations 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. Flash floods are posing constraints to the economic growth and the development process of a low-income country such as Ethiopia, and, in order to mitigate such hazard, it is crucial to understand the relative roles of two main factors: rainfall intensity and land use change. This study analyses the recent trends of rainfall intensity across Ethiopia and investigates the relative role of rainfall intensity and land use change in augmenting the frequency of flash flooding of the town of Dire Dawa by the Dechatu River. Results indicate that the increase in rainfall intensity is a more important factor than land use change in controlling the increased frequency of flash flood in Dire Dawa.