Investigation of wind characteristics of typhoon boundary layer through field experiments and CFD simulations
Investigation of wind characteristics of typhoon boundary layer through field experiments and CFD simulations
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通过现场试验和CFD模拟研究台风边界层的风特征
DOI：
10.3389/feart.2022.1058734
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发表时间：
2023-01
期刊：
影响因子：
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通讯作者：
Tiantian Li;H. Qu;Shengming Tang;Jie Tang;Jiaming Yan;Limin Lin;Yongping Li;Yuhua Yang
中科院分区：
文献类型：
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作者：
Tiantian Li;H. Qu;Shengming Tang;Jie Tang;Jiaming Yan;Limin Lin;Yongping Li;Yuhua Yang
传统测风塔一般在100 m以下，而100 m以上的台风边界层高分辨率观测资料较少，这限制了台风边界层的研究和工程应用，如台风多发区高层建筑和风力机的抗风设计。本文对超强台风利奇马（2019）的边界层风场进行了观测、模拟和分析。为了获得100 m以上的台风边界层观测数据，将多普勒测风激光雷达与传统的测风塔相结合，对台风边界层进行了观测。此外，本文还采用基于大涡模拟（LES）的计算流体动力学（CFD）方法，进一步研究了复杂地形对近地面风场特性的影响。结果表明，100 m以下平均风速廓线符合幂律分布。而台风登陆前后，在100-300 m高度的平均风速廓线上出现了一个不能用幂律描述的局地反向急流或低空急流。同时，湍流强度随高度的增加而增大，并经历较大的波动。此外，地面高程与拟合的平均风速廓线的幂指数之间存在显著的负相关关系。本研究为进一步了解台风边界层的风场特征提供了有用的资料。
High-resolution observations of typhoon boundary layer above 100 m are rare as traditional wind towers are generally below 100 m, which limits the study of typhoon boundary layer and engineering applications such as wind-resistant design of tall buildings and wind turbines in typhoon-prone regions. In this study, boundary layer winds of super typhoon Lekima (2019) are observed, simulated and analyzed. Together with traditional wind tower, Doppler wind lidar is utilized for observations of typhoon boundary layer in order to obtain measured data above 100 m. Besides, Computational Fluid Dynamics (CFD) simulation based on Large Eddy Simulation (LES) method is conducted to further investigate the impact of complex terrain on the near-surface wind characteristics. The results show that the power law fits the mean wind speed profile well below 100 m. However, before and after the typhoon lands, a local reverse or low-level jet occurs in the mean wind speed profile at the height of 100–300 m, which cannot be depicted by the power law. Meanwhile, the turbulence intensity increases with height and experiences larger fluctuations. In addition, there is a significant negative correlation between the ground elevation and power exponents of the fitted mean wind speed profiles. This study provides useful information to better understand wind characteristics of the typhoon boundary layer.