Improving Risk Projection and Mapping of Coastal Flood Hazards Caused by Typhoon-Induced Storm Surges and Extreme Sea Levels

Seawater inundation mapping plays a crucial role in climate change adaptation and flooding risk reduction for coastal low-lying areas. This study presents new elevation model called the digital impermeable surface (DISM) based on topographical data acquired by unmanned aerial vehicle (UAVs) improving seawater mapping. The proposed DISM model, along with bathtub was used to assess vulnerability significant tropical cyclone events region of Victoria Harbor Hong Kong. simulations were evaluated typhoon news reports which indicated actual storm surge conditions. Our findings revealed that obtains higher accuracy than existing (DEM) (DSM) RMSE 0.035 m. demonstrated skill DEM DSM better accounting water-repellent functionality each geospatial feature water inflow under real-life affirmed at least 88.3% inundated areas could be recognized successfully this newly-designed model. also accelerating sea level rise may pose threat comparable those induced super typhoons end 21st century two representative emission scenarios (RCP4.5 RCP8.5). overtop protective measures facilities, making it susceptible flood-related hazards.