Effects of climate change and typhoon intensity on extreme ocean dynamic environments: a case study of typhoon YAGI
摘要
With the influence of climate change and rising sea surface temperatures, typhoon intensity in the South China Sea has exhibited an increasing trend. This study using the WRF model, the Jelesnianski typhoon model, and the SWAN model to reconstruct wind and wave fields during Typhoon YAGI. SWAN's default WU wind drag formula is unsuitable for wave simulation during typhoon YAGI, while the FIL formula provides more accurate results. The one-dimensional wave energy spectra at M3 oil platform during typhoon YAGI peaks at 298.6 m2/Hz, with a corresponding frequency of 0.0736 Hz and HS of 13.13 m. When typhoon YAGI reached M3 oil platform, a significant discrepancy between wind and wave directions was simulated near Hainan Island, resulting in a bi-modal spectrum. The extreme wind and wave design parameters for the M3 oil platform affected by Typhoon YAGI, using 40 (1984–2023) years of hindcast-typhoon data. The 100-year and 50-year return period wind and wave parameters was enhanced by 4.18 m/s, 3.63 m/s, and 0.73 m, 0.64 m, respectively by Typhoon YAGI. An idealized approaching 50-year return period typhoon profile is proposed based on the simulated typhoon data, offering a reference for assessing extreme environmental load conditions at M3 oil platform.