Research on Characteristics of Field Measured Near-earth Turbulence of Typhoon "Soulik" by Transmission Tower

• Published in: IOP conference series. Earth and environmental science 2020-07, Vol.531 (1), p.12070
• Main Authors: Hongjie, Zhang, Guo, Huang, Bin, Xie, Yu, Wang, Xingjie, Wang, Chong, Zheng
• Format: Article
• Language: English
• Subjects: Anemometers; Transmission towers; Turbulence; Turbulence intensity; Typhoons; Variation; Wind; Wind speed
• ISSN: 1755-1307; 1755-1315
• DOI: 10.1088/1755-1315/531/1/012070

To explore the variation of mean wind speed, turbulence intensity and gust factor along the height, a 500kV transmission tower located in Ningde Fujian was chosen and the wind data during typhoon "Soulik" were collected from five anemometers arranged at 15m, 27m, 53m, 67m and 82m height. The results show that the rough factor decreases with wind speed when it is less than 12m/s, And little variation when wind speed over 12m/s. The friction velocity is increase with wind speed. The variation of the near-earth boundary calculated by the formula is not obvious with time, The average height of neutral ABL is 2,007.89m, which is much higher than the 350m of gradient height. Recommended by Chinese National Load Code for open terrain. The profile of mean wind speed of typhoon "Soulik" agrees well with the power law and the log law. In this paper, the expressions of longitudinal, lateral and vertical turbulence profiles are obtained by exponential fitting. Finally, the actual gust factor is fitted as the shape of Gi=α(Z10)β, and obtained the empirical expression of gust factor.