Hydro-Climatic Trends in the Upper Awash River Basin, Ethiopia
No Thumbnail Available
Files
Date
2019-06
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Addis Ababa University
Abstract
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.
Description
Keywords
Mann-Kendall, hydro-climatic, upper awash River basin