NDLI: Stochastic method to determine the scale and anomalous diffusion of gusts in a windy atmospheric boundary layer

Content Provider	Springer Nature Link
Author	Cheng, Xueling Hu, Fei Zeng, Qingcun
Copyright Year	2014
Abstract	In the atmospheric boundary layer, especially during strong wind period, the coherent structures are obvious and related to the direct interaction of the air masses with the ground. In this paper, we used the observation data during dust weather in Northwest Gansu to study the coherent structure and their “anomalous diffusion”. The structures in the atmospheric boundary layer included turbulent fluctuations and gusty wind disturbances, and could be denoted as “critical events”. Their fractal dimensions were expressed by the complex index μ of waiting times. Although the complex index can indicate the ability of the system to generate coherent structures, it has a strong dependence on the threshold marking the “critical events”. Hence, the continuous time random walk method was used to analyze the coherent structures. The scaling law of anomalous diffusion of coherent structures was obtained, and the diffusion scaling exponent H that indicated the ability of diffusion of different structures was analyzed. The exponents changed with structure scales which were affected by velocities and heights. At small scales, it was almost isotropic, and at large scales, the coherent structures were obvious and the diffusion was anomalous.
Starting Page	4890
Ending Page	4898
Page Count	9
File Format	PDF
ISSN	10016538
Journal	Chinese Science Bulletin
Volume Number	59
Issue Number	34
e-ISSN	18619541
Language	English
Publisher	Science China Press
Publisher Date	2014-08-19
Publisher Place	Heidelberg
Access Restriction	Subscribed
Subject Keyword	Gust Scaling law Anomalous diffusion Coherent structure Atmospheric boundary layer Science Life Sciences Physics Chemistry/Food Science Earth Sciences Engineering
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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