Record of Drought and Flood Series by Tree-Ring Data in the Middle Section of Qilian Mountain Since 904 A. D.

祁连山中部公元904年以来树木年轮记录的旱涝变化。

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The informative fractal dimension and its moving change may become a practical analytical index for the change of flood series and the climatic levels.

信息分维及其变化有望成为时间序列变化趋势和气候层次的诊断指标。

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It can be seen that the frequency curve calculation is basically reasonable and show the estimation of "1482 flood" return period is rational after putting palaeofloods into flood series.

把古洪水加入到洪水系列后进行频率计算，可以看出频率曲线基本合理，说明对1482年洪水重现期的判断是合理的。

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