Impacts of Typhoon on Wave Height at Bangkhuntien Shoreline

Abstract

Problem statement: In this study, the changing of wave height at Bangkhuntien during a passage of typhoon LINDA was simulated by using the Simulating WAves Nearshore Model (SWAN) version 40.41. The study domain covered from 99-101°E longitude and 12-14°N in latitude with resolution of 2.4×2.4 km. The simulation covered 10 days during typhoon LINDA entering into the Upper Gulf of Thailand. The wave height and its changing through the Bangkhuntien shoreline were simulated. The simulated significant wave height by the SWAN model at Petchburi and Ko Srichang buoy stations were compared with the observed significant wave height at these stations for the model verification. Approach: The significant wave height at Bangkhuntien shoreline during a passage of typhoon LINDA was simulated. Results: The results indicated that the significant wave height simulated by SWAN model were in good agreement with the observed data. The average simulated significant wave height at Bangkhuntien shoreline was 0.36 m and the significant wave height was in a range of 0.1-0.5 m. before typhoon LINDA entering into the Upper Gulf of Thailand. The significant wave height increased to 2.16, 2.22 and 1.66 m at 26, 18 and 5.7 m sea water depth respectively at the Bangkhuntien shoreline during typhoon LINDA passed. Conclusion: The findings of this study could be useful for the rising wave height, erosive calculation, shoreline protection and coastal zone management when typhoons passed through the Upper Gulf of Thailand.