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.
Highlights
Bangkhuntien is a district of the Bangkok Municipality under the authority of the Governor of Bangkok Thailand
Bangkhuntien shoreline is the only muddy shoreline in the Bangkhuntien district (Ekphisutsuntorn et al, 2010). This shoreline is located in the Upper Gulf of Thailand (Ekphisutsuntorn et al, 2010) which consists of four river mouths: the Mae Klong, the Tha Chin, the Chao Phraya and the Bang Pakong (Fig. 1)
The significant wave height during typhoon LINDA passed into in this area were simulated by the Simulating WAves Nearshore Model (SWAN) cycle III model version 40.51 (Booij et al, 2004; Ekphisutsuntorn et al, 2010; Hargreaves and Annan, 2001; Hasselmann et al, 1973; Wannawong et al, 2010a; 2010b; Saleh et al, 2010)
Summary
The significant wave height during typhoon LINDA passed into in this area were simulated by the SWAN cycle III model version 40.51 (Booij et al, 2004; Ekphisutsuntorn et al, 2010; Hargreaves and Annan, 2001; Hasselmann et al, 1973; Wannawong et al, 2010a; 2010b; Saleh et al, 2010). Data collection: The bathymetry data (1: 240,000) at the Upper Gulf of Thailand were taken from the Hydrological Department of the Royal Thai Navy, wind data (10 m height) obtained from the Thai Meteorological Department (TMD) was collected in every 3 h at Pilot station in 1981-2004 and the observed significant wave height at Petchburi and Ko Srichang buoys in 1996 and 1998 (Fig. 3) were taken from the Geo-Informatics and Space Technology Development Agency (Public Organization) (GISTDA).
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