Title: Improving reservoir water balance computation in semi-arid region using climatic data - a case study of Roseires-Blue Nile- multi-purpose reservoir
Abstract: Computing consistent reservoirs water balance is one of challenging tasks due to the wide range of involved parameters with different degrees of uncertainty; therefore, having an insight for each component is required to develop a realistic operation policy that allowing reservoirs to meet their design purposes successfully. This complexity increased in arid and semi-arid regions which characterized by unevenly temporally and spatially water quantity distribution, high evaporation and sedimentation rate in addition to reliable data unavailability problem in many developing countries. This paper presents a quantitative assessment of Roseires multipurpose reservoir at Blue Nile-Sudan-water balance, the methodology based on inflow statistical analysis, annual sedimentation rate estimation, and using global climatic data set to calculate the daily reservoir evaporation losses by adjusting Penman-Monteith equation. A set of 90 years inflow, reservoir water levels, climatic parameters and 8 bathymetric surveys data have been refined and employed in calculating the releases from reservoir using continuity and reservoir water balance equations, afterwards, the calculated releases have been compared to the measured one from the reservoir outlets. To check the adopted approach, two different evaluation performance criteria's have been applied, the methodology reflects outperformance particularly during dry seasons, however, the study shows, even with minor influence, the accurate lateral inflows, leakage and seepage estimation is essential to increase the reliability of this approach in addition to importance of regular reservoir's outlets calibration to reduce the variance between the actual and measured release.
Publication Year: 2012
Publication Date: 2012-01-01
Language: en
Type: article
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