浙南滨海丘陵地貌台风近地风剖面特性实测研究

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振动与冲击 ›› 2019, Vol. 38 ›› Issue (12) : 133-139.

论文

朱云辉1,孙富学2,姜硕2,史文海2,3,张传雄1,李正农4,赵喆斐3

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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

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摘要

基于浙江苍南滨海丘陵地貌测风塔（100m），实测获得了台风“莫拉克”登陆历程中不同高度风速及风向数据，并进一步研究了不同高度的平均风速和风向角、湍流度、阵风因子、相干系数、湍流积分尺度和功率谱密度等风剖面特性参数。研究表明：在测风塔所置浙南滨海丘陵地貌，台风作用下不同高度处的10min平均风速和风向角的变化非常同步，指数律能较好的反映风速沿实测高度范围内的分布规律；随着高度的增加，湍流度、阵风因子呈逐渐减小的趋势，湍流积分尺度均值呈逐渐增加的趋势；湍流度与我国规范差异较大，国家规范偏于保守；湍流度与阵风因子之间基本为线性关系，随着湍流度的增大，阵风因子相应增大，且随着高度增加，线性关系的离散度逐渐变小；顺风向湍流积分尺度的中位数剖面与日本规范较为接近；脉动风速的功率谱密度在顺风向与Von Karman谱在拟合较好，尤其是100m处，而在横风向相差较大；随着风速仪间距增大，相关性迅速变弱，同等间距时，高处要比低处的相关性好。

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.

导出引用

朱云辉1,孙富学2,姜硕2,史文海2,3,张传雄1,李正农4,赵喆斐3. 浙南滨海丘陵地貌台风近地风剖面特性实测研究[J]. 振动与冲击, 2019, 38(12): 133-139

ZHU Yunhui1, SUN Fuxue2，JIANG Shuo2， SHI Wenhai2,3，ZHANG Chuanxiong1, LI Zhengnong4，ZHAO Zhefei3. Experimental study on near-ground wind profile characteristics of typhoon in Coastal Hilly Geomorphology of Southern Zhejiang Province[J]. Journal of Vibration and Shock, 2019, 38(12): 133-139

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