1961-2020年宜昌市风速变化特征研究

Study on the Change Characteristics of Wind Speed in Yichang City from 1961 to 2020

利用宜昌市1961-2020年逐日2 min平均风速资料,采用气候倾向法、Mann-Kendall检验法和小波分析法,从不同时间尺度分析平均风速的变化趋势、突变和周期特征,揭示三峡局部地区长时间序列风速变化规律。结果表明:近60年来宜昌市年平均风速有增大的趋势,递增率为0.084 m/(s·10 a);四季平均风速均呈略增大趋势,四季气候倾向率相近。8月平均风速增大最快,6月平均风速增大最慢。Mann-Kendall突变检验分析得出宜昌市年平均风速在1971、1996和2013年发生突变。小波分析结果表明,年平均风速变化有周期性规律,其第一主周期为32年。

Using the daily 2-minute average wind speed data from 1961 to 2020 in Yichang City,the climate tendency method,Mann-Kendall test method and wavelet analysis method were used to analyze the change trend,mutation,and periodic characteristics of average wind speed at different time scales,revealing the long-term wind speed variation patterns in the local area of the Three Gorges area.The results showed that the annual mean wind speed in Yichang City had increased in recent 60 years with a decreasing rate of 0.084 m/(s·10 a),and the four seasons mean wind speed had a slightly increasing trend with a similar climate tendency rate.The increase of average wind speed was the fastest in August and the slowest in June.The Mann-Kendall mutation test showed that the annual mean wind speed in Yichang City had a sudden change in 1971,1996 and 2013.Wavelet analysis showed that the annual mean wind speed changes periodically,and the first main period of the annual mean wind speed change was 32 years.