الفهرس 
NILE BASIN HYDOROLOGY
Annual Reservoirs on the BaroOnly 14 pages are availabe for public view
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Abstract
Many development projects involving Nile waters are currently underway or being
studied. These projects will lead to changes in land-use patterns, and affect water
distribution and availability. It is important to assess the effects of a) these projects,
and b) evolving water resource management and policies, on regional hydrological
processes. This research seeks to establish a basis for evaluation of such impacts
within the Nile River sub-basin, using the RegCM3 Regional Climate Model to
simulate interactions between the land surface and climatic processes. The research,
presents the analysis of the climate effects of land use change for Baro-Akobo subbasins
based on two relatively long (25years) regional model (RegCM3) simulations.
Two different vegetation cover datasets are employed, one representing the current
land use and the other representing the potential vegetation cover without human
intervention. The possible effects and feedbacks induced by anthropogenic land use
change on the climate of Baro-Akobo are analyzed based on the differences in various
simulated climatic variables between the two simulations. The result for ECHAM
A1B scenario is estimated as following; 1)The annual precipitation will increase by
15%; 2)The average Temperature change for the dry months is vary from 1.9C0 to
4.0C0 however the change during wet months is vary from the 1.0C0 to 2.0C0; 3)
The daily evapo-transpiration rates showed a small change (+2% to +5%) during the
dry months although the increase in the evaporation rate is reach 13 % during the wet
months; 4) The overall annual change in flow is small (+3.0%). However, the
seasonality of flow increased. In average, early flood season flows in JJAs increase by
(+11%), while dry season and late flood season flows decrease by (-6%). The result
for the Land use change scenario by replacing the wetland and swamps located at the
Baro-Akobo-Sobat basin with irrigated croplands lead to the following:- 1)The
change in precipitation between the current land use conditions and the proposed
scenario is estimated as (~+0.5%). 2)The temperature will increase during the dry
months by (~+0.4 to ~2.5) while the temperature will decrees during the wet season
by around (~-0.5 to -2.0); 2)Decrease in the evapo-transpiration rate by (-8.7) during
the wet months and increase in the daily evapo-transpiration rates during the dry
months by (+ 1.9 ); 3)The change in the annul flow is estimate as (+6%).