Abstract ： Based on the characteristics of water-sediment and erosion-deposition in Sanmenxia Reservoir, the operating principle and mode of " discharging sediment by flood and generating by normal flow" are worked out, the relationships between discharging sediment and generation are handle reasonably, which can not only complete the task of discharging sediment in flood season and improve the location of erosion-deposition in reservoir region, but also reduce sediment concentration through hydraulic turbine when generating in flood season, improve the operating condition of turbo-generator set, increase generating duration and raise generating benefits.

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