WAVELET CHARACTERISTICS OF RAINFALL VARIATION IN THE THREE GORGE REGION OF CHANGJIANG RIVER^*

Making the climatic diagnosis of Changjiang Three Gorge Region by the maximum entropy spectrum analysis and wavelet analysis,we discovered that the main periods of the annual and wintertime precipitation variation in the east subregion differ from that in the west subregion.The former is a period of about 2 years,and the latter is about 5-6 years.Their wavelet patterns are also apparently different between two subregions:the alternate positive and negative wavelet patterns for the west,but not so regular for the east.These provide a climatic background for the implementation of Three Gorge Project.We also found that the historical reason of the main periods by combing synthetically spectrum analysis and wavelet analysis could be realized.In addition we suggest a gist of the climate forecast by analogy analysis based on the 2-dimensional wavelet figures.