超强台风山竹近地风场特性实测

Field Measurement of Near-Ground Wind Characteristics of Supper Typhoon Mangkhut

摘要:

基于356 m高的深圳气象梯度塔（SZGMT）的实测风速时程数据，分析了超强台风山竹侵袭过程风场特性的竖向分布规律。结果表明，SZGMT上游地面的平均风速剖面指数为0.238，略高于建筑结构荷载规范（GB50009-2012）的C类地貌的指数值；纵向湍流强度接近GB50009-2012 D类地貌的建议值，三向湍流强度比值较我国公路桥梁抗风设计指南的建议值小，并随高度的增加而增大；阵风因子和湍流强度呈高度线性相关，各向峰值因子的拟合结果接近2.5；纵向湍流积分尺度略大于日本规范AIJ 2004和美国规范ASCE7-2010的建议值；实测纵向风速谱和Von Karman谱具有较好的一致性。

Abstract:

Based on the wind speed records from the 356m high Shenzhen Meteorological Gradient Tower（SZMGT）， this paper analyzes the vertical distribution of wind characteristics during the invasion of the super typhoon Mangkut. The results show that： the mean wind speed profile exponent of the upstream surface of the SZGMT is 0.238， which is slightly higher than that of the Load Code for the Design of Building Structures （GB50009-2012） for terrain category C. The longitudinal turbulence intensity distribution is close to the recommended value of GB50009-2012 for terrain category D. The three-direction turbulence intensity ratio is smaller than the recommended value of Highway Bridge Wind Resistance Design Guide， and increases with the increase of height. The gust factor is highly linear with the turbulence intensity， and the fitting result of the peak factor is close to 2.5. The observed longitudinal turbulence integral scale profile is slightly larger than the recommended value of AIJ 2004 and ASCE7-2010， and the longitudinal wind speed spectra are consistent with Von Karman spectrum.