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

被引：8
|
作者：
Gu, HaiHua [1 ]
Wang, GuoHua [1 ]
Zhu, Wei [1 ]
Zheng, XiaoJing [2 ]
机构：
[1] Lanzhou Univ, Key Lab Mech Disaster & Environm Western China, Lanzhou 730000, Gansu, Peoples R China
[2] Xidian Univ, Sch Mechanoelect Engn, Res Ctr Appl Mech, Xian 710071, Shaanxi, Peoples R China
来源：
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY | 2019年 / 62卷 / 11期
基金：
中国国家自然科学基金;
关键词：
atmospheric surface layer; gusty wind disturbances; large-scale motions; MOTIONS;
D O I：
10.1007/s11433-019-9398-5
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
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.
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收藏
页数：7
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