摘要
结合降水量对农业生产的影响特点将全年降水量分成5个时段。根据聚类分析的结果将不同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。
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.
出处
《热带地理》
北大核心
1998年第3期201-204,215,共5页
Tropical Geography
基金
湖北省科委重点科技研究项目!0890
关键词
降水量
自相关
功率谱
周期变化
湖北
Precipitation
Autocorrelation analysis
Power spectral analysis
Periodic oscillation
