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利用db3小波分解和重构1965～2007年长江源沱沱河站、直门达站和黄河源吉迈站、唐乃亥站春汛期、夏汛期和枯水期流量数据,除沱沱河外,各站春汛期、夏汛期和枯水期流量皆呈下降趋势,各站流量下降速率依次为夏汛期>春汛期>枯水期。沱沱河站多年流量呈增加趋势,夏汛期变化速率依然高于春汛期。应用复Morlet小波分别分析上述4个水文站实测流量的周期特征。黄河源总体存在11～12 a波动周期;长江源春汛期有4～6 a波动周期,夏汛期有13～14 a波动周期。不同流域春汛期、夏汛期和枯水期主周期分布规律不同。
Using db3 wavelet to decompose and reconstruct the data of spring flood season, summer flood season and dry season of the Yangtze River source Tuotuohe, Zhimenda and Yellow River source Jimai and Tangnaihai stations from 1965 to 2007, except the Tuotuohe River, , The summer flood season and the dry season both showed a downward trend, and the rate of decline in the stations was Xiaxun> Spring flood> dry season. The Tuotuohe Station has been increasing its annual flow for many years, and the rate of change in summer flood season is still higher than that in spring flood season. The periodic Morlet wavelet analysis is applied to the periodic characteristics of the measured flow of the above four hydrological stations. The Yellow River source generally has a period of 11 ~ 12 a fluctuation; the Yangtze River source has a period of 4 ~ 6 a fluctuation in spring flood season and a 13 ~ 14 a fluctuation period in summer flood season. The distribution pattern of main period in different flood season in spring flood season, summer flood season and dry season is different.