Experimental study on generation discharge mismatch between the Three Gorges and Gezhouba

Abstract

Due to the design reasons, the maximum generation flow of the Three Gorges hydropower station does not match the over flow of Gezhouba hydropower station, especially the discharge at peak load in flood season will greatly exceed the full output flow of Gezhouba hydropower station. The excess flow of Gezhouba needs to be discharged from the flood discharge dam section. The potential energy is not converted into electric energy, but directly converted into kinetic energy. The discharge flow velocity is large, which may affect the scour of the downstream reach of the dam. In order to reveal the influence of Gezhouba power plant waste water on the scour of the lower reaches of Gezhouba, this paper carried out a model test study of Gezhouba waste water under the condition that the power generation flow of the Three Gorges and Gezhouba does not match, and analyzed the law of the change of the downstream flow pattern under different waste water conditions of Gezhouba. The results show that the decrease of the abandoned water flow of Gezhouba can help to reduce the flow velocity near the dam downstream, while the influence of the change of the abandoned water flow on the scour downstream is limited.