Experimental study and flow analysis on a new design of water-retaining sluice gate

As a water-retaining structure, the hydro-automatic flap gate (HFG) has advantages, such as easy operation, simple structure, attractive appearance, cheaper investment, and simple installation and maintenance compared to traditional gates. As such, the flow pattern analysis and flow rate analysis on this hydraulic structure have important engineering significance. In this paper, an experimental study was carried out for testing the water flow during the opening process of a bottom shaft driving flap gate. Three different opening velocities (once in 20 years, once in 50 years, once in 100 years) were selected for obtaining detailed characteristics. Then the space-time change laws of velocity and other hydraulic parameters of gate, gate pier and stilling pool were described. Moreover, the results of the flow regimes under conditions of once in 20 years, once in 50 years, once in 100 years were compared with each other. The findings and conclusions of this paper provide the basis for the project implementation in a sediment-laden river, and provide reference for other similar projects.