Coastal near ground actually measured wind field characteristics in typhoon “Soudelor” moving process

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (11) : 272-278.

ZHANG Jianguo, WEN Zujian, LEI Ying

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Abstract

Based on the field measurements of matrix layout anemometers in Dadeng island of Xiamen city, the wind velocity and direction data in four time intervals of typhoon ‘Soudelor’ are selected to analyze the coastal near ground wind characteristics during the typhoon moving. The mean wind speed and direction, wind profile, gust factor, turbulence intensity, turbulence scale and spectra in different time interval are discussed in detail. The four time intervals are corresponding to the typhoon center distance of 400km, 250km, 150km and 120km from the wind measurement towers respectively. The relationships between these parameters and typhoon center distance and height are presented. The results show that the wind profile meet the logarithmic law and the roughness length equals to 4.0m or so. The variation of gust factors and turbulence intensities is slow during whole process of moving. There is a linear relationship between gust factors and turbulence intensities. The ratio of turbulence intensity in alongwind, across-wind and vertical direction is 1:0.8:0.45. The power spectra in alongwind, across-wind agree with von Karman spectrum, but that in vertical direction does not meet. The outputs in this study are very useful for further understanding of the typhoon influences to coastal area during typhoon moving. It is also helpful to improve the wind resistance capacity of coastal engineering structures.

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field measurement / near ground wind characteristics / typhoon center distance / typhoon moving

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ZHANG Jianguo, WEN Zujian, LEI Ying. Coastal near ground actually measured wind field characteristics in typhoon “Soudelor” moving process[J]. Journal of Vibration and Shock, 2024, 43(11): 272-278

References

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