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利用采自澜沧江上游杂多地区的树木年轮资料重建了1293-2006年3-9月扎曲河香达水文站平均径流量序列。对重建资料进行订正,并将1955年以前的重建资料与1956-2006年实测序列衔接,应用多窗谱分析和小波分析等方法研究了扎曲河流域过去714年径流量的时间演变及周期、突变特征。结果表明,扎曲河流域径流量有着显著的2~6年为主的高频变化和20~50年为主的低频变化特征,其中ENSO分量是一个最主要的周期分量,QBO分量的振幅呈显著的18~24年缓变包络特征,而年代际分量在19世纪后期到20世纪逐渐增强。过去714年扎曲河流域径流量有12个丰水期及15个枯水期以及3个明显的突变点,且最近的一次突变是发生在20世纪初的负突变。
Using the tree ring data collected from the Heterozygos area in the upper reaches of the Lancang River, the average runoff series of the Xanda Hydrological Station from March to September in 1293-2006 were reconstructed. The reconstructed data were revised, and the reconstructed data before 1955 and the measured sequence from 1956 to 2006 were connected. The multi-window analysis and wavelet analysis were used to study the time evolution and period of runoff in the ZaQu river basin in the past 714 years. Mutational characteristics. The results show that the runoff in the Zhaqu River Basin has significant high frequency changes of 2 ~ 6 years and low frequency variations of 20 ~ 50 years. The ENSO component is one of the most important periodic components. The amplitude of the QBO component Significant 18 ~ 24 years of slow envelope characteristics, and interdecadal components in the late 19th century to 20th century gradually increased. In the past 714, the runoff in the Zhaqu River Basin had 12 wet and 15 dry periods and 3 distinct breakpoints. The most recent one is the negative mutation that occurred at the beginning of the 20th century.