Flood inundation simulation based on coupled hydrologic hydrodynamic model

As frequent flood disasters occurring in small and medium watersheds of China,exploring new type of urban rainfall runoff model is a hotspot in the current researches. By coupling hydrologic model with hydrodynamic model,urban flood inundation may be simulated at an improved computing speed.Meixi basin is taken as an case study area to explore the applicability of the coupled model in small and medium watersheds of China. The study results show that inundation depth is basically consistent with verification value,with no possibility of error due to water balance calculation.By analyzing inundation depth map and time to maximum depth,spatial distribution and temporal distribution of regional flood disaster can be obtained to support decision-making for flood management in small and medium watersheds. But the reliability of the model may be questioned to a certain extent owing to lack in hydrologic data of small and medium watersheds.

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