Flood Risk Assessment Using TELEMAC-2D Models Integrated with Multi-Index Analysis in Shenzhen River Basin, China

An urban flood simulation model based on TELEMAC-2D was constructed, and the inundation data of two measured rainstorms (7 June 2018 16 September 2018) were selected to validate model. Flooding processes simulated under 12 designed rainfall scenarios with return periods 20, 50 100 years peak coefficients 0.2, 0.4, 0.6 0.8, respectively. The hazard-vulnerability (H-V) method used for risk assessment. hazard factors included depth, velocity, elevation slope. vulnerability land use type, population density property distribution. analytic hierarchy process (AHP) calculate weight values each indicator factor, ArcGIS software overlay calculation. results analysis show that as coefficient factor increases, area zone increases varying degrees. larger more serious flooding. As period effect change in highest diminishes. is largest within Luohu District (LHD), accounting 46.38%, 60.92% 45.54% total area, Futian (FTD) but its proportion has a decreasing trend, Longgang (LGD) an increasing trend. zoning map can better reflect distribution basin provide scientific basis early warning prevention drainage Shenzhen River basin.