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| Experimental study on near-ground wind profile characteristics of typhoon in Coastal Hilly Geomorphology of Southern Zhejiang Province |
| ZHU Yunhui1, SUN Fuxue2，JIANG Shuo2， SHI Wenhai2,3，ZHANG Chuanxiong1, LI Zhengnong4，ZHAO Zhefei3 |
1.Oujiang College, Wenzhou University, Wenzhou 325035,China;
2.College of Civil Engineering and Architectural, Wenzhou University, Wenzhou 325035,China;
3.RMIT University, VIC 3030, Australia;
4.College of Civil Engineering, Hunan University, Changsha 410082,China |
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Abstract Based on the geomorphological anemometer tower (100 m) in the coastal hills of Cangnan, Zhejiang Province, the data of wind speed and direction at different heights in the landing process of Typhoon Morakot were obtained.The characteristic parameters of wind profile, such as average wind speed and wind direction angle, turbulence degree, gust factor, coherence coefficient, turbulence integral scale and power spectral density, were further studied.The results showed that the changes of 10 min mean wind speed and wind direction angle at different heights are very synchronous under the action of typhoon, and the exponential law can well reflect the distribution of wind speed along the measured height range in the coastal hilly landform of southern Zhejiang where the wind tower is located.With the increase of height, the turbulence degree and gust factor decrease gradually, and the mean value of turbulence integral scale increases gradually, the turbulence degree is quite different from the national norms, which tend to be conservative.There is a linear relationship between turbulence and gust factor.with the increase of turbulence, the gust factor increases accordingly, and with the increase of height, the dispersion of linear relationship decreases gradually.The median profile of downwind turbulence integral scale is close to that of Japanese code; the power spectral density of fluctuating wind speed is well fitted with Von Karman spectrum in downwind direction, especially at 100 m, but varies greatly in crosswind direction; with the increase of anemometer spacing,the correlation becomes weaker rapidly, and the correlation at the high level is better than that at the low level at the same distance.
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Received: 10 October 2018
Published: 15 June 2019
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