Search

In order to solve the problem of sediment accumulation in the diversion canal, which adversely affects the water supply system, this paper designs a diversion and sand discharge system at the head of the canal to improve the efficiency of water use. According to the measured data of a section of the Yellow River Ningxia, a two-dimensional numerical simulation is used to construct a two-dimensional hydrodynamic model and a sediment model based on MIKE 21 for a section of the Yellow River Ningxia to simulate the water diversion at the head of the canal under two different working conditions. The results of the study show that the diversion channel changes the equilibrium of the hydrodynamic elements of the river, direct diversion canal (case 1) flow dynamics axis has oscillated 46.6m towards the concave bank, the average sand content of the channel is 0.6 kg/m³ and the maximum sand content is 0.89 kg/m³; the axis of flow dynamics in the sand reduction diversion channel (case 2) has oscillated 62.6 m towards the concave bank, the flow velocity at the head of the channel is in the range of 0.2~0.4 m/s, the average sand content of the channel is 0.2 kg/m³ and the maximum sand content is 0.6 kg/m³. Therefore, the design of the head of case 2 can improve the sediment deposition problem of the diversion canal and enhance the durability of the water intake system. [ABSTRACT FROM AUTHOR]