| Today’s rapid economic and social development,people have more demand for water resources,China’s water shortage and spatial and temporal distribution is increasingly serious,especially in the northern areas of serious groundwater overdraft,some of its cities’ local water sources can no longer meet the social development of water needs,and cause serious environmental security risks.Given this environment,inter-basin water transfer projects have become the top priority of water resources redistribution in China,aiming to solve the problem of uneven distribution of water resources between regions,and people also pay more attention to planning long-distance water transfer projects from the perspective of safety and economy.Due to the complex topography and changing geological conditions of long-distance water transfer systems,the form of water transfer is often not a single similar,usually using a combination of open channels and pressurized pipelines,the project scheduling operation simulation becomes more and more complex,the analysis of its hydraulic characteristics is of great significance.Numerical simulation technology has been developed faster and applied on a large scale.The numerical modeling system,which integrates model construction,calculation processing,and visualization analysis,can simulate the hydrodynamic process in the water transfer project,ensure the safe operation of the water transfer line through scientific simulation of scheduling operation,and provide a reasonable basis for the planning and design of the actual project.This paper takes a key water transfer project as the research background,by generalizing the complex internal boundary conditions such as gates and inverted siphons,using the Prisman hypothesis applied to pressurized flow and free flow and giving a general solution,capable of simulating both constant and non-constant flow,applying the Hydro Info one-dimensional hydrodynamics module,and then establishing a numerical hydrodynamic model of the complex internal boundary.Through the simulation of different operating conditions,the flow distribution and head changes in the pipe and canal system are analyzed,and the analysis of the simulated values shows high reasonableness and accuracy,indicating that the model can better respond to the hydrodynamic change process of the system.The research results can provide a reasonable scheduling plan and operation plan for the project,realize the optimal distribution of water resources and ensure the safety of water supply to the maximum extent. |
