基于设计基准条件的台风边界层脉动风速谱建模方法研究

Modeling method for fluctuating wind velocity spectrum in typhoon boundary layer based on conditions of design reference

利用在博贺峙仔岛观测站实测的台风黑格比数据,在莫宁-奥布霍夫相似理论框架内提出了一种数据驱动的考虑设计基准条件的台风边界层脉动风速谱建模方法。首先基于均匀各向同性湍流能谱需满足的基本模型准则,将六参数脉动风速谱统一模型简化为四参数谱模型;之后基于高频区和低频区脉动风速谱特征建立了四个谱参数的理论表达式,并利用实测的台风黑格比数据将谱参数理论表达式进行参数化处理,进而提出基于设计基准条件的脉动风速谱建模方法;最后利用台风黑格比过程中任意选取的四个1 h时长样本对上述脉动风速谱建模方法进行了验证,表明其与实测样本的风速谱具有较好的一致性。

A data-driven model was proposed to model wind velocity spectrum of typhoon boundary layer considering conditions of design reference.This model was established based on Moning-Obukhov similarity theory （MOST）and the field measured data of typhoon Hagupit on Zhizai Island,Bohe.Firstly,the six-parameter general model was simplified into a four-parameter spectral model by matching the model criteria of energy spectrum in homogeneous turbulent flow.Secondly,the theoretical expressions of the four spectral parameters were determined based on the features of wind velocity spectrum in lower and higher frequency ranges.Then the data-driven model considering conditions of design reference was established through parameterizing the four spectral parameters with the field measured data of typhoon Hagupit.Finally,the validation of the data-driven model was examined with arbitrarily selected four 1-hour length data sets in the process of typhoon Hagupit.It was shown that the wind velocity spectrum modeled using the proposed method agrees well with that obtained using the actual measured samples.