May 1, 2015 Thesis Open Access

TSEGA WOLDESELASSIE

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    <subfield code="a">CLIMATE CHANGE IMPACT ASSESSMENT ON RUNOFF POTENTIAL IN UPPER AWASH BASIN: A CASE STUDY OF LEGEDADI - DIRE CATCHMENT</subfield>
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    <subfield code="a">&lt;p&gt;Climate change is a global challenge. It is known regional hydrology is influenced by global climate change, through changes in patterns of precipitation temperature, runoff and other hydrologic variables. This has serious consequences on societal development and the costs of achieving adequate levels of water security. In this study climate change impacts on runoff water potential at catchment scale for the two selected catchment in Upper Awash Basin have been assessed. The two catchments included in the study were Legedadi (205 Km2) and Dire (77.56 Km2) catchments. A 0.44&amp;deg; resolution data of Coupled Model Inter-comparison Phase5 (CMIP5) global climate models (GCMs) output of precipitation and temperature (max&amp;amp; min) for 2020&amp;rsquo;s (2016-2035), 2050&amp;rsquo;s (2046-2065) and 2080&amp;rsquo;s (2081-2100) under (RCP 4.5) were applied to assess the climate change scenarios. Bias correction was applied to these forcing variables. Moreover, a hydrological model, Arc-SWAT, was utilized to simulate runoff in the study area. Sensitivity analysis result shown that Curve Number (CN) factor are the most sensitive parameters affecting the hydrology of the catchments. The model was calibrated from 1988-1997 and validated from 1998-2003 at the estimated outlet of Legedadi and Dire catchment. In terms of hydrological modeling performance, at both catchments (NSE) indices are greater than 0.8 and 0.85 for calibration and validation period respectively.&lt;/p&gt;</subfield>
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