Abstract: In order to improve the stability and computational efficiency of hydrodynamic simulation, a method of junction-point water stage prediction and correction(JPWSPC)is proposed to deal with the backwater effects at the junctions between general open-channel networks and hydraulic structures. On this basis, a one-dimensional hydrodynamic model is established to calculate the variations of water level process and hydraulic detention time under different water diversion demands. Results show that in the presence of diversion and storage of hydraulic structures, different diversion flow has no obvious effect on water areas and water landscapes; while hydraulic detention time is closely related to overflow discharge. Through optimizing and adjusting diversion flow and diversion ratio, the model provides a technical basis for ensuring efficient utilization of water and reducing economic costs.

Key words: junction-point water stage prediction and correction, one-dimensional hydrodynamic simulation, water diversion demand, hydraulic detention time, overflow discharge