Hydro-Climatic Trends in the Upper Awash River Basin, Ethiopia

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Addis Ababa University


The aim of this study is to detect and analyze the trends of monthly seasonal and annual temperature, precipitation and stream flow in the upper Awash River Basin. A number of statistical tests exist to assess the significance of trends in time series. One of the commonly used non-parametric trend tests is Mann-Kendall test. The null hypothesis in the Mann-Kendall test is that the data are independent and randomly ordered. In this study, mean monthly, seasonally, and annually temperature, precipitation, and streamflow have analyzed to determine the variability in magnitude over the period1986-2017. Trend in mean monthly, seasonally, and annually temperature, precipitation and streamflow trends are analyzed using Mann-Kendall test and sen’s slop estimation for the data period 1986-2017. In this paper, therefore, an attempt has been made to identify the trends of temperature, precipitation and streamflow on different climatic and hydrological stations in the Upper Awash River Basin. The study has analyzed monthly, seasonally, and annually precipitation, maximum and minimum temperature, and streamflow trends over the upper Awash River Basin. The mean maximum and minimum temperature for monthly, seasonally, and annually has shown sharp increasing trends especially minimum temperature for most of the stations. Analysis of monthly, seasonally and annually trend in precipitation shows negative trends for months, seasons and annually of most stations. However, some stations show forward trend at the significant level alpha =0.05. The trends of the streamflow also show significant decreasing trend for the selected hydrological stations.



Mann-Kendall, hydro-climatic, upper awash River basin