Discharge Error Analysis of Check Gate Combined with Inverted Siphon in a Canal Simulation System

Sluice gate is the key factor of accuracy in a canal simulation system. Due to the coupled relationship between the Saint-Venant equations and the discharge of gates, the gate flow rate at a time is calculated from the sampling of water depth gathered last step. The article analyzed this approximation of water depth data based on a complete canal simulation system. Then, according to the combination of the inverted siphon and the sluice gate in the middle route of the South-to-North Water Transfer Project, the paper studied the influence of the structure on the calculation of gate discharge and put forward that the operation mode with a constant depth upstream gate might provide a higher accuracy compared to the one with a canal constant downstream depth in the middle route project.