Analysis of Flood Warning Rehearsal Based on One-dimensional Hydrodynamic Model

In recent years, global climate change has increased the occurrence of extreme rainfall events, frequently triggering large-scale flooding disasters, which have severe impact on the economic security and social stability of both upstream and downstream areas. Thus, the flood evolution process becomes the hot topic in hydrodynamic research. Aiming to address several issues faced by certain river such as the large scale of flood process, complex flow regime and variable river channel cross-sections, this paper simulates the changes in flow and water levels at key river channel control stations along the main river based on one-dimensional hydrodynamic model (Hydrus-1D) and evaluates the flood process in its upstream section. The comparison between the numerical solutions obtained by the model simulation and the measured data shows that the simulation outputs of the constructed one-dimensional hydrodynamic model are highly consistent with the measured data of the actual river channel cross-section, which demonstrates the good reliability and stability of this model. The findings of this study enable accurate simulations of flow and water level processes at river channel control stations and effective simulation for flood early warning and rehearsal, offering technical guidance for reservoir construction, regulation, storage and operation.