摘要
针对小波变换方法的不足,运用经验模态分解(EMD)方法对黄河上游唐乃亥站1956-2014年近60年径流量数据进行多时间尺度分析,结果表明:唐乃亥站年径流量序列存在准2-3年、准7-8年、准15年和准20年的波动周期。同时,EMD方法作为一种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的分量,在水文水资源变量的分析及建模中具有广阔的应用前景。
Pointed to the shortage problem of Wavelet Transform, the annual runoff timeseries from 1956 to 2014 of Tangnaihai Station in the upper stream of the Yellow River was decomposed by multiple time - scale series with EMD method. The results showed that： the runoff time series existed with periods fluctuating about 2 -3 years, 7 -8 years,15 years and 20 years. In the meantime, the EMD as for an original multiple -reso- lution signal processing method the sub - series of different fluctuation periods can be more accurately separa- ted fromannual runoff time series. This method can be widely used into variable analysis and modeling ofo hydrology and water resources.
出处
《青海农林科技》
2015年第3期44-46,88,共4页
Science and Technology of Qinghai Agriculture and Forestry
关键词
黄河上游
年径流量
多时间尺度
经验模态分解
The upper stream of the Yellow River
Annual runoff
Multiple time - scale ~ EMD
