Open channel hydraulic response characteristics in irrigation area based on unsteady flow simulation analysis

In order to serve the information construction of the Shitouhe irrigation area, in this paper, we simulated and analyzed the canal flow and gate opening characteristics with the theory of unsteady flow and automation under different conditions along the 10 km long first reach of east main canal in the Shitouhe irrigation area. In the process of analysis, first of all, the whole canal was divided into several sections, and the sections were numbered from upstream to downstream; then the error of water depth between measured and calculated accordingly was minimized, which was used as the objective function for finding the roughness based on the calculation principle of the water surface curve of the open-channel constant gradual flow; at last we simulated and analyzed the canal flow and gate opening characteristics using different schemes under different boundary conditions and roughness coefficients obtained above.