Author(s): Guannan Wang; Zhuowei Zhou; Xin Xu; Wenbo Gao; Quanke Su
Linked Author(s): Guannan WANG
Keywords: Typhoon-induced storm surge waves higher-resolution terrain sea-level rise
Abstract: Impacted by global climate change, storm surges induced by tropical cyclones (i. e. heavy wind, rogue wave, and sea-level rise) impose severe threat to the safety of coastal infrastructure and population in Hong Kong. To more accurately simulate the significantly impact of typhoon-induced storm surges on the region, a coupled numerical model with higher-resolution terrain and multi-scale nested grid for Hong Kong was established based on the atmospheric model (WRF), the ocean model (FVCOM), combined with the wave models (WaveWatch III and Delft-3D). Compared to the field-measured data, the reliability of the model was validated. Based on the multiple severe typhoons passed through Hong Kong in the past 25 years, the coupled effect of tide, typhoon-induced storm surge, and waves on Hong Kong was addressed. The results verify that improved methods, i. e. high-resolution terrain, multi-scale grids from offshore to coast, and more suitable physical parameterization schemes, can enhance the accuracy and stability of wave models in simulating the coastal waves. The dependency characteristics between typhoon-induced sea level rise, waves and typhoon intensity were addressed. This study can provide reliable data for the decision-making on the disaster prevention and mitigation for coastal infrastructure in Hong Kong under typhoons.
Year: 2025