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Self-Similar Characteristic for the Ramp Structures of Wind Speed |
SONG Zong-Peng1,2, HU Fei1, XU Jing-Jing1, CHENG Xue-Ling1 |
1State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chi-nese Academy of Sciences, Beijing 100029, China
2University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract Time series of wind speed are composed of large and small ramp structures. Data analysis reveals a power law relation between the linear slope of ramp structures and the time scale. This suggests that these ramp structures of wind speed have a self-similar characteristic. The lower limit of the self-similar scale range was 2 s. The upper limit is unexpectedly large at 27 min. Data are collected from grassland, city, and lake areas. Although these data have different underlying surfaces, all of them clearly show a power law relation, with slight differences in their power exponents.
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Received: 02 December 2013
Revised: 16 January 2014
Accepted: 19 February 2014
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Corresponding Author:
HU Fei
E-mail: hufei@mail.iap.ac.cn
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