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在分析小波变换不足之处的基础上,提出了水文时间序列多分辨率分析的EMD方法,并将其应用于洮河天然年径流量时序波动特征的多时间尺度研究。结果表明其年径流量变化存在准2~6年、准8~10年、准26年的波动周期,并分析了各分量的趋势变化。EMD方法作为一种全新的非线性、非平稳信号处理理论,可以更精确地提取水文时序中不同波动周期的分量,在水文水资源系统变量的分析及预测中具有广阔的应用前景。
Based on the analysis of the inadequacies of wavelet transform, an EMD method for multi-resolution analysis of hydrological time series was proposed and applied to multi-time scale study of natural annual runoff fluctuation characteristics. The results showed that there were quasi-26-year fluctuation periods of quasi-2-6 years, quasi-8-10 years, and annual variations of annual runoff. The trend of each component was also analyzed. As a new theory of non-linear and non-stationary signal processing, the EMD method can extract components of different fluctuation periods in hydrological sequence more accurately and has broad application prospects in the analysis and prediction of system variables of hydrology and water resources.