The Wind Speed Fluctuation over the Desert-Oasis Ecotone during Sunny and Duststorm Weather Processes

doi:10.7522/j.issn.1000-694X.2015.00238

JOURNAL OF DESERT RESEARCH ›› 2017, Vol. 37 ›› Issue (3): 414-420.DOI: 10.7522/j.issn.1000-694X.2015.00238

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The Wind Speed Fluctuation over the Desert-Oasis Ecotone during Sunny and Duststorm Weather Processes

An Zhishan, Zhang Kecun, Tan Lihai, Cai Diwen

Key Laboratory of Desert and Desertification/Dunhuang Gobi and Desert Research Station/Gansu Center for Sand Hazard Reduction Engineering and Technoogy, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China

Received:2015-09-10 Revised:2015-10-10 Online:2017-05-20 Published:2017-05-20

Abstract

Abstract: The wind speed fluctuation characteristics of the desert-oasis ecotone in Heishanzui area of Dunhuang was studied using a portable gradient wind measurement system during sunny and duststorm weather processes. The results show that wind speed fluctuations at different heights have good correlation in both sunny days and duststorm processes in the same observation point, and more significant correlation occurs in the adjacent height. The wind speed fluctuation range increases with increasing height. Meanwhile, the fluctuation intensity of wind speed first increases then decreases along the direction from desert to oasis during sunny days, while it continuously decreases during sandstorm processes. Wind speed fluctuation rule in sunny days is similar to that in a duststorm processes. However, the correlation of wind directions in the same measuring point is more significant during duststorm processes compared with that in sunny days, and the wind speed fluctuation intensity is larger. Besides, wind speed is positively related to the fluctuation intensity, and the duststorm has certain inhibitory effect on strength of the fluctuation intensity.

Key words: desert-oasis ecotone, wind speed fluctuation, correlation, fluctuation intensity

CLC Number:

P425

An Zhishan, Zhang Kecun, Tan Lihai, Cai Diwen. The Wind Speed Fluctuation over the Desert-Oasis Ecotone during Sunny and Duststorm Weather Processes[J]. JOURNAL OF DESERT RESEARCH, 2017, 37(3): 414-420.

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The Wind Speed Fluctuation over the Desert-Oasis Ecotone during Sunny and Duststorm Weather Processes

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