| In the confluent area, flow pattern is tangled, the changes of sediment erosion and deposition are big, and the condition of navigation is complex. Besides, with the construction of hydraulic engineering complex in the upper reaches of confluent area, the conditions of incoming water and sediment will change greatly and the hub daily regulation and the dam flood discharge will have serious implications for the channel conditions. So it is of great significance to study that the water-sediment movement characteristics on the confluence and the operation of upstream hydraulic engineering complex have a great impact on the navigation flow conditions.This paper was carried out from the western communication construction of the "study on the technology of navigation flow condition and regulation in confluent area of the upper reaches of the Yangtze River". In the basis of reviewing the research results on the saliva sediment movement, Tuojiang confluent area is selected as a support project, a undistorted river model with the scale for 1:100 is made, and the fixed bed and the mobile bed experiments are carried on. Through the model text and theoretical analysis, the hydraulic characteristics on the Tuo River confluence affected by the natural runoff, Xiangjia Dam daily regulation and dam flood discharge are studied systematically and the change in scour and fill of bed on the confluence is affected by Xiangjia Dam hub flood discharge. The longitudinal and transversal water surface profiles and the distribution characteristics of velocity affected by confluent ratios are analyzed in detail. The distributions of fluctuating kinetic energy and relative turbulent intensity on the different discharge are mainly studied. It is found that Xiangjia Dam hub flood discharge has little effect on the navigation flow conditions and the changes in scour and fill of bed on the Tuo River confluence and it can basically meet the navigational requirements.
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