Probability distribution of wind speed at different time scales in Alxa Right Banner， Inner Mongolia，China

doi:10.7522/j.issn.1000-694X.2022.00115

Journal of Desert Research ›› 2023, Vol. 43 ›› Issue (2): 37-42.DOI: 10.7522/j.issn.1000-694X.2022.00115

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Probability distribution of wind speed at different time scales in Alxa Right Banner， Inner Mongolia，China

Jiaqi Zhao(), Chunlai Zhang(), Guoru Wei

State Key Laboratory of Earth Surface Processes and Resource Ecology / MOE Engineering Research Center of Desertification and Blown-sand Control，Faculty of Geographical Science，Beijing Normal University，Beijing 100875，China

Received:2022-05-08 Revised:2022-08-01 Online:2023-03-20 Published:2023-04-12
Contact: Chunlai Zhang

Abstract

Abstract:

Based on the hourly wind speed data of Alxa Right Banner from 1960 to 2015， the cumulative probability distribution of wind speed in different time scales （day， month and year） was statistically analyzed. The results show that WeibullCum distribution function is universally applicable in different time scales when describing the cumulative probability distribution of wind speed. In the cumulative probability distribution functions of multi-year averaged daily and monthly wind speed， four constant terms in WeibullCum function changes periodically. In the functions of yearly from 1960 to 2015， two constant terms change periodically and the other two terms change in a decreasing trend. According to the statistics of daily， monthly and yearly sand-driving wind frequencies from 2016 to 2020， and the probabilities of sand-driving wind in the same period， the distribution function has high prediction accuracy for monthly and yearly sand-driving wind occurrence frequencies， but it doesn't work for daily sand-driving wind occurrence frequencies resulted from the great uncertainty of wind in the daily time scale.

Key words: cumulative probability distribution function of wind speed, WeibullCum distribution function, sand-driving wind

CLC Number:

P425

Jiaqi Zhao, Chunlai Zhang, Guoru Wei. Probability distribution of wind speed at different time scales in Alxa Right Banner， Inner Mongolia，China[J]. Journal of Desert Research, 2023, 43(2): 37-42.

Figures/Tables 8

Table 1 Statistical characteristics of monthly average wind speed

风速指标	月份
风速指标	1	2	3	4	5	6	7	8	9	10	11	12
多年平均	2.95	3.42	3.92	4.15	4.23	4.09	3.98	4.06	3.59	3.15	3.03	2.98
最大值	5.49	4.58	5.78	5.78	6.13	6.34	5.73	5.85	5.03	4.28	5.02	4.80
最小值	1.48	2.28	2.60	2.83	2.60	2.86	2.90	2.42	2.23	2.12	1.91	1.76
标准偏差	0.78	0.63	0.75	0.78	0.81	0.77	0.71	0.78	0.64	0.59	0.71	0.64

Fig.1 Monthly average wind speed frequency distribution and cumulative frequency distribution in Alxa Youqi

Fig.2 Daily variation of Ad， Bd， Cd and Dd

Fig.3 Monthly variation of Am，Bm， Cm and Dm

Fig.4 Variation of Ay， By， Cy and Dy from 1960 to 2015

Fig.5 Comparison between probability and actual frequency of daily sand-driving wind from 2016 to 2020

Fig.6 Comparison between probability and actual frequency of monthly sand-driving wind from 2016 to 2020

Fig.7 Comparison between probability and actual frequency of annual sand-driving wind from 2016 to 2020

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Probability distribution of wind speed at different time scales in Alxa Right Banner， Inner Mongolia，China

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