Fast and high-precision simulation of hydrodynamic and water quality process in river networks
To realize a fast and high-precision simulation of unsteady flows and water quality process in river networks,a 1-D mathematical modelling system for free-surface flows and water quality process is developed.In the hydrodynamic model,a θ semi-implicit method is used to discretize the free-surface gradient term in the momentum equation while the Eulerian-Lagrangian method is employed to solve the advection term.To achieve good mass conservation,the finite-volume method is used to discretize continuity equation.Moreover,the resulting hydrodynamic model is unconditionally stable with respect to the gravity wave speed and flow advection.In solving the scalar transport equation,the forward difference is used for discretization in time while the centre-difference is in space.A sub-cycling is introduced to divide the computational time step and improve the stability of water quality model.Therefore,large time steps are allowed in both the hydrodynamic and the transport models.The coupling of the branches of the river networks is solved using a prediction-correction method.Then,a Gaussian pulse test and a rectangular wave test are employed to demonstrate the accuracy and the efficiency of the system,which will also provide powerful supports for ecological operations of cascade reservoirs in drainage basins.
Chengwei Lu Jianzhong Zhou Dechao Hu Shuai Yuan Yi Liu
School of Hydropower and Information Engineering,Huazhong University of Science and Technology,43007 School of Hydropower and Information Engineering,Huazhong University of Science and Technology,43007
国际会议
2018 International Symposium on Water System Operations(ISWRSO 2018)(2018年水资源系统及调度国际研讨会)
北京
英文
1-5
2018-10-12（万方平台首次上网日期，不代表论文的发表时间）