汾河天然年径流量波动特征多时间尺度分析的EMD方法

EMD Method for Multiple Time-scale Analysis on Fluctuation Characteristic of Natural Annual Runoff Time Series of Fen River

针对小波分析的不足之处,运用EMD法对汾河河津水文站还原后的天然径流量时序进行多时间尺度分析,并揭示了各分量的趋势变化及影响因素。研究表明,EMD作为一种全新的多分辨率信号处理方法,可以更精确地提取年径流量时序中不同波动周期分量,在水文水资源领域具有广阔的应用前景。

Through analyzing problem of wavelet analysis,the annual runoff time series from 1956 to 2000 of Hejin hydrological station in Fen River are decomposed into multiple time-scale series with EMD method. The results show that the runoff time series have periods about 2～4,8,15 and 40 years,and the trends and factors of the IMF sub-series are discussed. The study shows that ,sub-series of different fluctuation periods can be separated from annual runoff time series more accurately with EMD that is an original multiple--resolution signal processing method and can be used widely in hydrology and water resources domain.