Research on River Network Water Dispatching and Flood Risk System Based on Hydrological Hydrodynamic Coupling Model

Flood risk assessment system is an effective measure for flood defense. The characteristic water level threshold related to river network storage capacity is an important factor affecting the spatial distribution of flood disasters. In view of the complex hydrological conditions in coastal plain areas, based on ensuring flood control safety, it is particularly important to fully utilize hydrological spatiotemporal data and explore the optimization strategy of characteristic water levels. A flood risk assessment system is developed by analyzing river network topography, cross-section parameters and geographic information system, and combining with the hydrological and hydrodynamic coupling model. Combined with the human-computer interaction interface of the system, the characteristic water level threshold is adjusted to increase the river network storage capacity. By using the flood analysis system based on flood scheduling and hydrodynamic model, the river network regulation and storage space is expanded by adjusting the characteristic water level, providing scientific planning for the flood control idea of coastal basins with a combination of hilly and plain areas, and providing solid theoretical support and decision-making reference for the dynamic scheduling of river network water levels during flood seasons.