A tight coupling model for urban flood simulation based on SWMM and TELEMAC-2D and the uncertainty analysis

Abstract

The urban flood of rainstorm has posed a major threat to human life and property in recent years, seriously affecting the sustainable development of society. The numerical model can simulate how an urban flood develops and moves, and then guide how to reduce the disaster's impact. This study develops a tight coupling model named STUFMS based on Storm Water Management Model (SWMM) and TELEMAC-2D for urban flood simulation. Theoretical and practical cases were respectively applied to verify the reasonability and accuracy of the model. The theoretical case demonstrates that the STUFMS can better simulate the process of water exchange between the surface and rainwater drainage systems while the practical case suggests that the change in water level and the flooded area simulated by the STUFMS are basically consistent with the typical historical rainfall events. The uncertainty analysis revealed that terrain resolution and temporal resolution of rainfall series have a significant impact on the inundation scopes. Generally, the STUFMS model behaved well in simulating the urban flood process, offering a novel tool for numerical modeling of urban flood.