Spatial and temporal characteristics of average wind speed in the wind erosion region of northern China
HAN Liu;WANG Jing-pu;WANG Guang-zhen;WANG Zhou-long;WU Meng-quan;College of Resource and Environmental Engineering,Ludong University;
In order to research the temporal and spatial characteristics of wind speed changes in the wind erosion region of northern China,annual and seasonal wind speed data from the 155 meteorological stations evenly distributed in the study area were selected from 1971 to 2015,and the methods of climate trending rate,spatial interpolation and wavelet analysis method were used. The annual and seasonal wind speed characteristics,spatial variability of the range of wind speed variety and the period of wind speed changes were analyzed. The results showed as follows that the annual average wind speed was 2. 70 m·s~(-1) in the wind erosion region of northern China and reduced significantly at a rate of 0. 017 m·s~(-1)·a~(-1)( α = 0. 001) in the last 45 years. Furthermore,the seasonal wind speed trend rate were-0. 023 m·s~(-1)·a~(-1)( spring),-0. 017 m·s~(-1)·a~(-1)( summer),-0. 016 m·s~(-1)·a~(-1)( autumn),-0. 014 m·s~(-1)·a~(-1)( winter)( α = 0. 001),respectively. Wind speed decreased fastest and slowest were in1980 s and 1990 s respectively,and wind speed increased only in 2010 s. There were significant differences in different decades and seasons. The change range of wind speed had different spatial distribution in the wind erosion region of northern China. The wind speed decreased quickly in the central east,central west,northwest and east part of northern China. The southeastern part of Gansu,Ningxia,northern parts of Shanxi and Shaanxi,Liaoning and northeastern and western parts of Xinjiang provinces were areas where wind speed were not significantly decreasing. In spring and summer,the area of wind speed reduced quickly has extended,and the area of wind speed reduced slowly has extended in winter and autumn. Morlet wavelet analysis revealed that average wind speed exhibited quasi-periodic variations of around 28 year,and the average change period was about 18 years. At present,the wind erosion region of northern China is experiencing a low wind velocity stage. This paper used the latest time series data to analyze the temporal and spatial analysis of wind speed in the whole wind erosion region of northern China to improve the overall and forward understanding of wind speed changes and lay the foundation for predicting the future trend of wind speed,which is of far-reaching significance for preventing the disasters and improving the ecology and environment of the wind erosion region of northern China,and provide reference and scientific basis for the nation to develop and make plans for wind energy resources.
【Fund】： 国家自然科学基金重点项目(41330746);; 山东省自然科学基金培养项目(ZR2017PD006);山东省自然科学基金面上项目(ZR2015DM015)
【CateGory Index】： P425
【CateGory Index】： P425