A TECHNO-ECONOMICAL SUSTAINABILITY STUDY OF HYDROELECTRIC RESERVOIRS: CASE STUDY OF MEROWE DAM IN SUDAN

EL Sadig Mohammed Sharfi, Ibitihal M. Alnijome, Bouran Awad Mohamed

Abstract


The reservoir storage loss caused by sedimentation is a critical problem for those reservoirs which are expected to provide Hydro-power. Hence, it is getting more important to promote sustainable sedimentation management in the near future. The main research objectives are to use data for both the dam and reservoir, to provide an approach for policy formulation which will be applied for decision making. At the same time, it also prompt policymakers stand at the national level to recognize the importance of reservoir storage protection. It worth mentioning that, in this research, the output of a calibrated/validated hydrodynamic model is judiciously applied as an input to a reservoir conservation model (RESCON). The key algorithm of the model is an economic optimization function, supported by engineering
relationships that allow the quantification of basic parameters. The management strategies were assessed further with RESCON model. Removing a portion of sediment at Merowe
for the downstream river reach maintenance was considered, but because of small head available for hydro suction, it was found practically impossible to achieve a worthwhile result in removing sediment through HSRS. Sediment removal through flushing was found technically infeasible for flushing discharge lower than 2000 m3/s and duration of
flushing of 35 days. In addition to its technical feasibility, i.e. it is not possible to completely flush the deposit due to its impacts on the downstream users. Among the available alternatives dredging was found technically feasible, and it retains maximum long-term capacity but only on its second cycle (year). Based on the RESCON model estimates, 18
dredges capable of removing 189 million m3 per year each must be installed to keep the reservoir sustainable.


Keywords


flushing;dredging;Sedimentation;RESCON;HEC-RAS;HEC-GEORAS

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References


. Bouran Awad Hassan Mohammed /Department of

Civil engenirrng, University of Khartoum,(2016.).


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