Abstract & Overview
This study investigates storm surge and wave-induced hazards along the Cagayan Coastal Boulevard in Santa Ana, Cagayan, Philippines, using high-resolution numerical modeling. The study quantifies storm tide and wave setup contributions to coastal flooding, incorporating historical typhoon events to assess their impact on infrastructure and flood heights. A systematic shortlisting method was applied to identify critical typhoons based on key meteorological parameters: maximum wind speed (Vmax), closest approach distance, and radius of maximum wind speed (Rmax). This approach ensures that selected storms represent the most severe coastal hazard conditions for the study area. Results indicate that Typhoon Ellen (1983) generated the highest storm tide (2.43 m), while Typhoon Nuri (2008) induced the highest storm waves (3.94 m), demonstrating the significant influence of wave-driven processes. Compared to previous national-scale assessments, our study highlights that storm tide estimates without wave setup may underestimate total water levels, reinforcing the importance of wave radiation stress in open-coast environments like Cagayan. The findings inform sustainable urban coastal planning and climate adaptation strategies in highly exposed regions.