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根据三峡库区2007-2011年期间的日水位资料,首先对库区水位序列进行小波消噪,然后采用Morlet小波函数对水位消噪时间序列进行了多时间尺度小波分析,揭示三峡水库水位调度变化的多时间尺度的结构特性,并分析不同尺度下的水位调度周期性变化规律.结果表明:各年日水位调度变化出现阶段性的变化特点,主要集中在6-12月,且其波幅明显高于其他月份;不同年份水位调度存在不同时间尺度的变化周期,2007-2011年周期性分析结果显示,2007年的变化周期为57d和17d;2008年的变化周期为56d和9d;2009年的变化周期为64d和36d;2010年的变化周期为64d和25d;2011年的变化周期为64d.
According to the daily water level data of the Three Gorges Reservoir from 2007 to 2011, the water level series in the reservoir area are first de-noised by wavelet, and then Morlet wavelet function is used to carry out multi-time scale wavelet analysis on the water level de-noising time series to reveal the variation of water level regulation And the regularity of periodicity of water-level dispatching under different scales was analyzed.The results showed that the variation of water-level dispatching in each year showed a periodical change mainly concentrated in June-December and its amplitude was obviously higher In other months, the water level dispatching varied in different time scales in different years. From 2007 to 2011, the periodic analysis showed that the change periods in 2007 were 57d and 17d, the change periods in 2008 were 56d and 9d, and the changes in 2009 The period is 64d and 36d; the period of change in 2010 is 64d and 25d; the period of change in 2011 is 64d.