A study on near-earth wind profile characteristics of typhoon “Soulik” in southeast coastal area

LI Dongliang,ZHANG Hongjie,HAN Junke

Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (16) : 118-123.

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PDF(3133 KB)
Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (16) : 118-123.

A study on near-earth wind profile characteristics of typhoon “Soulik” in southeast coastal area

  • LI Dongliang1,ZHANG Hongjie2,HAN Junke2
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Abstract

To explore the change of mean wind speed, turbulence intensity and gust factor along the height, a 500 kV transmission tower located in Ningde Fujian was chosen and the wind data during typhoon “Soulik” were collected from five anemometers arranged at 15 m, 27 m, 53 m, 67 m, and 82 m height.The results show that the rough factor decreases with wind speed when it is less than 12 m/s, and there is little change when wind speed over 12 m/s.The friction velocity increases with wind speed.The change of the near-earth boundary calculated by the formula is not obvious with time, the average height of neutral ABL is 2 007.89 m, which is much higher than the 350 m of gradient height, recommended by Chinese National Load Code for open terrain.The profile of mean wind speed agrees well with the power law and the log law.In this paper, the expressions of longitudinal, lateral and vertical turbulence profiles were obtained by exponential fitting.Finally, the actual gust factor was fitted as the shape of Gi=α(z/10)β, and the empirical expression of gust factor was obtained.

Key words

typhoon “Soulik” / wind profile / turbulence / gust factor / power law

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LI Dongliang,ZHANG Hongjie,HAN Junke. A study on near-earth wind profile characteristics of typhoon “Soulik” in southeast coastal area[J]. Journal of Vibration and Shock, 2021, 40(16): 118-123

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