湖北省降水量的周期分析

结合降水量对农业生产的影响特点将全年降水量分成５个阶段，根据聚类分析的结果将不同的时段的降水量进行分区，由此对全省的降水量做自相关分析和功率谱分析，从而发现了降水量的变化周期。

THE PERIODIC ANALYSIS OF PRECIPITATION IN HUBEI PROVINCE

According to the influence of Precipitation on agricultural production, the year can be divided into 5 precipitation periods, and from the results of precipitation cluster analysis, Hubei Province Can be divided into 5 Precipitation regions. By using autocorrelation and power spectral analyses, the piodic oscillation for Pcipitation for each region is found. The results are as follows: 1) From power spectral method, the time series of precipitation shows mainly short waves, especially 4 year period. 2) The trend of long term variation of precipitation is not obvious. 3) Antocorrelation analysis shows that in flood season if Serious drought (flood) occurs, three years later big flood (drought) would Probably occur. That coincides with the 4 year period of precipiation from power spectral analysis.