Gusty wind disturbances and large-scale turbulent structures in the neutral atmospheric surface layer

被引：2

作者：

HaiHua Gu ^{[1
]}

GuoHua Wang ^{[1
]}

Wei Zhu ^{[1
]}

XiaoJing Zheng ^{[2
]}

机构：

[1] Key Laboratory of Mechanics on Disaster and Environment in Western China, Lanzhou University

[2] Research Center for Applied Mechanics, School of Mechano-Electronic Engineering, Xidian University

来源：

Science China(Physics,Mechanics & Astronomy) | 2019年 / Mechanics & Astronomy)2019卷 / 11期

基金：

中央高校基本科研业务费专项资金资助; 中国国家自然科学基金;

关键词：

atmospheric surface layer; gusty wind disturbances; large-scale motions;

D O I：

暂无

中图分类号：

P425 [风];

学科分类号：

0706 ; 070601 ;

摘要：

This study analyzes the contribution of large-scale turbulent structures, including very large-scale and large-scale motions, to the streamwise turbulent kinetic energy and momentum flux in comparison with the contribution of the gusty wind disturbances based on the high-quality data obtained from the field measurements conducted in the near-neutral surface layer. The results of this study denote that the gusty wind disturbances contain only a portion of the energy contained in very large-scale motions and do not contain any of the information contained in large-scale motions. The amount of lost contributions to the streamwise turbulent kinetic energy and momentum flux increases linearly with the friction velocity, eventually becoming 53% and 67%,respectively. This indicates that large-scale turbulent structures(very large-scale motions and large-scale motions) better describe the coherent structures in the atmospheric surface layer when compared with the gusty wind disturbances.

引用

页码：102 / 108

页数：7

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