摘要
运用EMD方法对黄河下游花园口站1952—2009年年径流量及年输沙量的时间序列资料分别进行了多时间尺度分析,得到了各自具有不同周期的波动分量以及趋势分量。结果表明:黄河下游年径流量、年输沙量的变化过程具有复杂的多时间尺度特性,是多种波动成分共同作用的结果;年径流量和年输沙量变化过程均存在3个波动周期,而趋势项呈递减的态势;相同尺度下的水、沙分量之间具有显著的相关性,而不同尺度下的水、沙分量之间基本无相关性。
The method of Empirical Mode Decomposition （EMD） was applied to the annual runoff and sediment at Huayuankou Station in the lower Yellow River from 1952 to 2009, and several intrinsic mode functions （IMFs） and one residual function were obtained from each series. The results show as follows ： there is complex multiple time-scale character in the series of annual runoff and sediment of the lower Yellow River. It is induced by the fluctuation components jointly. The annual runoff and sediment series have 3 fluctuations respectively. The residual functions of the two se- ries are depressed. The same time scale components of the two series have notable relativity, however the different time scale components have little relativity.
出处
《人民黄河》
CAS
北大核心
2012年第8期33-35,共3页
Yellow River
基金
水利部公益性行业科研专项(200901021)
关键词
EMD
多时间尺度
年径流量
年输沙量
花园口站
黄河下游
Empirical Mode Decomposition
multiple time-scale
annual runoff
annual sediment
Huayuankou Station
lower Yellow River
