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### 1961~2010年河西地区平均风速时空变化趋势分析

1. 南京大学地理与海洋科学学院海岸与海岛开发教育部重点实验室, 江苏 南京210023
• 收稿日期:2013-07-18 修回日期:2013-09-11 出版日期:2014-11-20 发布日期:2014-11-10
• 通讯作者: 潘少明，教授。E-mail:span@nju.edu.cn
• 作者简介:张克新 (1980-)，男，甘肃省民勤县人，博士研究生，研究方向为土壤侵蚀、干旱区域环境与绿洲建设等。E-mail:xbsdzkx2008@163.com
• 基金资助:
国家自然科学基金项目(41166002,41271289,41230751)共同资助

### Spatial and Temporal Trends of Average Wind Speed in Hexi Area in 1961-2010

Ke-xin ZHANG, Shao-ming PAN, Li-guo CAO

1. Ministry of Education Key Laboratory for Coastal and Island Development, School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing, Jiangsu 210023,China
• Received:2013-07-18 Revised:2013-09-11 Online:2014-11-20 Published:2014-11-10

Abstract:

Hexi area is characterized with a vulnerable ecological system and severe soil erosion in the northwest of China. Analyzing the trend of the average wind speed is critical for wind resources management and soil erosion control in this region. Based on the monthly average wind speed of the 15 weather stations in Hexi area from 1961 to 2010 and using the methods of climate trending rate, 5 years running mean tread, Inverse Distance Weighted interpolation, Mann-Kendall abrupt change test and wavelet analysis method, the spatial and temporal trends of the average wind speed as well as the possible influential factors were analyzed in Hexi area of Gansu Province from 1961 to 2010. The main results are as follows: 1) The annual average wind speed was 2.9 m/s in Hexi area. The annual average wind speed obviously decreased at the rate of approximately 0.14m/(s·10 a) (α=0.001) in Hexi area during the period of 1961-2010. Furthermore, on the seasonal scale, the decreased rate of four seasons was similar. The mainly reason why the annual average wind speed decreased significantly was that the frequency of 5 or more than 5 levels of wind have decreased over recent years. 2) This trend has different spatial distribution in Hexi area. The average wind speed decreased significantly in the whole region and different subregions in recent 50 years, the decreasing rate in Guangzhou County and Yumen City were the biggest and the smallest one was in Wushaoling area. 3) Abrupt change was found in the long-term climate variation. The Mann-Kendall abrupt change test showed that the year of 1985 can be viewed as turning point of the abrupt change on an annual wind speed basis. While from the perspective of seasonal wind speed, the abrupt change points in summer and autumn appeared slightly earlier than those in spring and winter. The abrupt change of the average wind speed happened in 1985 in summer and autumn while that of spring appeared in 1987. The abrupt change of winter happened in 1986. 4) Morlet wavelet analysis revealed that average wind speed exhibited quasi-periodic variations of around 6 years, 19 years and 25 years.

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