STUDY ON NEAR-SURFACE WIND CHARACTERISTICS OFFSHORE PINGTAN DURING TYPHOONS IN FUJIAN PROVINCE

Yang Lihui; Wu Huanping; Zhang Xiuzhi

doi:10.19912/j.0254-0096.tynxb.2024-1621

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (7) : 458-469. DOI: 10.19912/j.0254-0096.tynxb.2024-1621

Special Topics of Academic Papers at the 74th Annual Meeting of the China Association for Science and Technology

STUDY ON NEAR-SURFACE WIND CHARACTERISTICS OFFSHORE PINGTAN DURING TYPHOONS IN FUJIAN PROVINCE

Yang Lihui¹, Wu Huanping², Zhang Xiuzhi²

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Abstract

Using the data of 7 typhoon cases by 3 offshore masts near Pingtan in Fujian Province, the analysis shows that when the masts are located on the left side of the typhoon’s forward direction, the wind direction changes counterclockwise, and when the mast is located on the right side, the wind direction changes clockwise. 180°/30 min only occurs when the center of the typhoon passes the masts. According to the changes of air pressure, wind speed, wind direction and the distance of the typhoon path from the mast during the typhoon period, the turbulence intensity, gust coefficient; Wind vertical shear index and wind direction change were calculated in three periods,such as the front eye wall area, the typhoon eye and the rear eye wall area. The results show that the turbulence intensity is the largest at 10 m in all periods with a value of 0.10-0.19, and the turbulence intensity above 30 m has little vertical variation, and the first period is the smallest. It is 0.07-0.10, the second period was 0.09-0.12, there was a large difference in the third period. The gust coefficient is the highest at 10 m, with a value of 1.26-1.60, and 1.2-1.45 at 40-90 m, The minimum in the first period is 1.18-1.30, the maximum in the third period is 1.12-1.45, and the middle in the second period is 1.20-1.38. The wind shear index at 10-40 m during the first and second periods for wind measurement towers 1 and 2 is slightly higher than that of 40-90 m, because the wind mainly comes from the sea during the two periods. The wind shear index in the third period is slightly higher than that in the first and second periods, because the wind in the third period mainly comes from land.

Key words

wind farm / typhoon / near-surface wind / turbulence intensity / gust coefficient / wind vertical shear

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Yang Lihui, Wu Huanping, Zhang Xiuzhi. STUDY ON NEAR-SURFACE WIND CHARACTERISTICS OFFSHORE PINGTAN DURING TYPHOONS IN FUJIAN PROVINCE[J]. Acta Energiae Solaris Sinica. 2025, 46(7): 458-469 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1621

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