Figure 1 Upper Awash basin location map
Method
Climate change and water resource fluctuation are inseparable natural
events. Whether it is a quantifiable or unquantifiable change in these
events might result in hydroclimate change and it could devastate
socio-economy. To assess and
evaluate the existing long-term climate change effect in Upper Awash
basin water resource fluctuation, climate and streamflow data are
subjected to topographic traced hydroclimate statistical trend analysis.
To evaluate the hydroclimate trend
of the basin, Mann Kendall and modified Mann Kendall’s trend analysis
with Sen’s slope estimator is used. The Mann Kendall and modified Mann
Kendall’s trend evaluation is based on the data autocorrelation.
Data
The upper Awash basin hydroclimate trend analysis for the 1991 - 2015
time series or basin’s 25 years periodical hydroclimate elements
precipitation, temperature, and streamflow are subjected to statistical
trend evaluation. The climate data of more than 15 stations within the
basin are collected from Ethiopian National Meteorological Agency (NMA)
and based on data consistency eleven stations (Table 1) are subjected to
trend analyses.