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Title: Grand Ethiopian Renaissance Dam Reservoir Operation Simulation using HEC-ResSim and its impact on downstream Hydropower Generation
???metadata.dc.contributor.*???: Yilma Sileshi (PhD)
Zelalem, Tesfaye
Keywords: HEC-ResSim;Reservoir Operation;Simulation scenario;GERDP;Roseries;Sennar;Merowe;HAD
Issue Date: Mar-2014
Publisher: AAU
Abstract: In this study, HEC-ResSim model was used to simulate operation of existing hydraulic infrastructure, and major irrigation schemes in the Eastern Nile river basin and the new hydraulic infrastructure (GERDP).The main objective of this research is to find out the extents of the impact to which the introduction of new upstream reservoir, GERDP, on downstream users of the Nile waters by using the HEC-ResSim reservoir simulation model. Repeated runs of the HEC-ResSim model were made using different filling and after filling of GERDP scenarios to compare the effect of GERDP under alternative operating policies. The computational algorithm in HEC-ResSim is divided in to three major components: (1) watershed setup, (2) reservoir network, and (3) simulation for Calibration, Baseline and Alternative (Dry, Wet and Average filling and after filling) phase scenarios. The methodology computes the required releases to limit storage to the capacity available based on the probabilistic properties of future flows, conditional to current stream flow conditions. The first setup was to simulate gaged flow routing without taking into account effects of development using the flow data of 1956 to 2003 and a good agreement was observed between simulated and gaged data at El-Deim, Khartoum, Dongola, Hassanab and Tamaniat stations. The correlation coefficient R values for those stations were found to be in good agreement and found to be more than 0.925 for each station. Following this, the model was configured to simulate the existing and proposed development intervention. 2 The baseline development Scenario is considering only existing major water infrastructures (i.e. reservoirs) and major irrigation schemes in Sudan and Egypt for a period of 1956 to 2003. The simulation result showed that an average annual energy of 14,810.83GWh/year is produced by Roseires, Sennar, Merowe and HAD. The Alternative scenario development which includes during filling and after filling of GERDP, HEC-ResSim simulation, has discovered that long term effects of new upstream reservoir on the operation of downstream reservoirs. After filling of GERDP phase scenario simulation using flow data of 1956 to 2003, the simulation result showed that an average annual energy of 31,363.63GWh/year will be produced by GERD, Roseries, Sennar, Merowe, and HAD (111.76% increase than without GERD), the reduction of average annual energy by 395.41 GWh/year from HAD will be compensated by the energy produced by GERDP and Sudan power plants, which will increase the total energy produced by the whole Eastern Nile system. During the filling phase scenario simulation results showed that an average annual energy of 27,041.96 GWh/year, 25,695.48 GWh/year, and 31,213.61 GWh/year will be produced by the 5 power plants during Average, Dry and Wet filling Scenarios respectively and average annual energy production from GERDP will be 11,314.38, 8,974.19, and 11,925.61GWh/year for the respective sequence of filling years. An average monthly power of 1,625.46MW and average annual energy of 14,238.99GWh/year will be produced during normal operation of GERDP (i.e. after filling from 2019-2066 for 48 years). Due to upstream regulation (i.e. intervention of GERDP, in the upstream of the Eastern Nile river basin) there will be an increase in average monthly inflow downstream in the driest month of the year and the annual average reservoir pool level increase which result in increase of power head.
Appears in Collections:Thesis - Hydraulics Engineering

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