Hydro-Climatic Variability: A Characterisation and Trend Study of the Awash River Basin, Ethiopia

Hydrology

Richard Koech¹  MahtsenteTibebe Tadese²  Lalit Kumar²  Birhanu Zemadim³ 

[1] Department of Agriculture, Science and Environment, Central Queensland University, Bundaberg Campus, Bundaberg QLD 4670, Australia;Environment and Rural Science, University of New England, Armidale 2351, Australia;International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), BP 320, West and Central Africa Regional Hub, Bamako 00223, Mali;

关键词: Awash Basin;    hydro-climate;    variability;    streamflow;    trend;   

DOI  :  10.3390/hydrology6020035

来源: DOAJ

【 摘 要 】

The objective of this study was to characterize, quantify and validate the variability and trends of hydro-climatic variables in the Awash River Basin (ARB) in Ethiopia using graphical and statistical methods. The rainfall and streamflow trends and their relationships were evaluated using the regression method, Mann−Kendall (MK) test and correlation analysis. The analysis focused on rainfall and streamflow collected from 28 and 18 stations, respectively. About 85.7% and 75.3% of the rainfall stations exhibited normal to moderate variability in annual and June to September rainfall, respectively, whereas 96.43% of rainfall stations showed high variability in March to May. The MK test showed that most of the significant trends in annual rainfall were decreasing except in two stations. These research findings provide valuable information on the characteristics, variability, and trend of rainfall and streamflow necessary for the design of sustainable water management strategies and to reduce the impact of droughts and floods in the ARB.

【 授权许可】

Unknown