基于小波分析的三峡水库调度水位变化特性

Water level regulation variations of Three Gorges reservoir based on wavelet analysis

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.

Based on annual water level data of Three Gorges reservoir （TGR） from 2007 to 2011, the wave- let domain denoising and Morlet wavelet analysis are used to study the annual water level, which reveals more complex structure of time scales of the TGR, and analyzes the periodic variation regularity of water level regulation of TGR. The results show as follows, the variations of daily water level regulation have a periodic change characteristic, which were mainly concentrated in June to December; and the amplitudes were higher than orther months obviously. The daily water level of different years has the periodic varia- tion in time scales. Results from the periodic analysis of 2007-2011 show that the periodic oscillations of 2007 were 57-day and 17-day; the periodic oscillations of 2008 were 56-day and 9-day; the periodic oscilla- tions of 2009 were 64-day and 36-day; the periodic oscillations of 2010 were 64-day and 25-day; the periodic oscillation of 2011 were 64-day.