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Contributions and Blunders by Building Sanmenxia Reservoir
Author(s): 
Pages: 1-2,5
Year: Issue:  11
Journal: Yellow River

Keyword:  sedimentationstoring clear water and discharging muddyequilibrium of silting and scouringflood controlSanmenxia ReservoirYellow River;
Abstract: Sanmenxia Reservoir is the first large hydraulic project constructed on the Yellow River. Analyzing its contributions and blunders will make a lesson for the further work on harnessing the river. Serious backwater deposits occurred since the site of reservoir is a wrong choice in project planning. But later on the rebuilding work and operational mode adopted are successful. The operational mode of storing clear water and discharging muddy is a successful one to keep the reservoir operated in long term. The facts that the reservoir deposition and erosion had been in equilibrium from 1974 to 1985 and the extinct effect of reservoir operation on flood control of the lower Yellow River showed the contribution of reservoir recon-struction. The function of flood prevention is not because of the flood detention of reservoir but of the decrease of sediment deposit by 6. 4 billion t in the lower river,i. e. the depth of deposition decreased by 3. 30 m in average caused by detention of sediment 9. 2 billion t in the reservoir. The practice of operation mode of Sanmenxia Reservoir demonstrates the possibility of long term operation of reservoir on laden river. Since the Yellow River has very high concentration besides using the flow and sediment discharge regulation by reservoir to enhance the transport capacity the meas-ures of detention of sediment and desilting deposits by reservoir have to be taken for the retention and utilization of sediment.
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