A dynamic bidirectional coupled surface flow model for flood inundation simulation

Abstract. Flood disasters frequently threaten people and property all over the world. Therefore, an effective numerical model is required to predict impacts of floods. In this study, a dynamic bidirectional coupled hydrologic–hydrodynamic (DBCM) developed with implementation characteristic wave theory, in which boundary between these two models can dynamically adapt according local flow conditions. The proposed accounts for both mass momentum transfer on coupling was validated via several benchmark tests. results show that DBCM effectively reproduce process flood propagation also account surface interaction non-inundation inundation regions. implemented floods simulation occurred at Helin Town located Chongqing, China, shows capability risk early warning future management.