相干结构对0814号强台风“黑格比”湍流特性的影响

1.深圳大学土木与交通工程学院,广东深圳518060;2.深圳市海上基础设施安全与监测重点实验室,广东深圳518060;3.哈尔滨工业大学(深圳)土木与环境工程学院,广东深圳518055

结构工程;台风;相干结构;风特性;非平稳性;非高斯性

Influence of coherent structure on turbulence characteristics of 0814 strong typhoon Hagupit
LI Lixiao1,2,HUANG Yuqing1,CHEN Shangxin1,HUANG Xigui3,XIAO Yiqing3,and CHEN Xianchuan1

1.College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, Guangdong Province, P. R. China;2.Shenzhen Key Laboratory of Structure Safety and Health Monitoring of Marine Infrastructures, Shenzhen 518060, Guangdong Province, P. R. China ;3.College of Civil and Environmental Engineering, Harbin Institute of Technology, Shenzhen 518055, Guangdong Province, P. R. China

structural engineering; typhoon; coherent structure; wind characteristics; nonstationary; non-Gaussian

DOI: 10.3724/SP.J.1249.2022.06629

备注

为了探究实测台风眼壁强风区和风眼区风速非平稳性的形成机理,以0814号强台风“黑格比”实测数据为研究对象,用离散小波变换结合假设检验的方法对风场的相干结构进行辨识与提取,探讨相干结构对风速非平稳性、非高斯性以及风场湍流特性参数的影响规律.研究结果表明:对于0814号强台风“黑格比”,相干结构是造成风场脉动风速具有非平稳性和非高斯性的关键因素,提取相干结构后非平稳样本的非平稳性和非高斯性显著减弱;相干结构对各湍流参数的平均贡献介于6.42%~32.40%.相干结构持时占样本时长的比值平均为10.60%,对湍动能贡献占比最高达40.50%.相干结构具有“短持时、高含能”的特点,是造成湍流参数值异常偏大的根本原因.研究可为非平稳风作用下结构精细化抗风设计提供参考.
In order to explore the formation mechanism of the nonstationary wind speed in the eye wall regions and eye region of a typhoon, taking the measured data of No. 0814 strong typhoon Hagupit as the research object, we identify and extract the coherent structure of the measured wind field by discrete wavelet transform combined with hypothesis testing, and analyze the influence of the coherent structure on the nonstationary and non-Gaussian wind speed and study the influence of the coherent structure on the wind turbulence characteristics. The results show that for the 0814 typhoon Hagupit process, the coherent structure is the main reason that leads to the nonstationary and non-Gaussian fluctuating winds in the typhoon field, and with the coherent structures being exacted from the original winds, the nonstationary and non-Gaussian characteristics of the nonstationary wind samples are significantly weakened. The average contribution of the coherent structure to the turbulence parameters ranges from 6. 42% to 32. 40%. The duration of the coherent structure is about 10. 60% of the sample duration, however, its contribution to turbulent kinetic energy is up to 40. 50%. The coherent structure has the characteristics of short duration and high energy content, which is the cause of the abnormally large turbulence parameter value. This study can provide a reference for the refined wind resistance design of structures under the action of nonstationary wind.
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