三门峡站天然年径流量周期性分析

Analysis on Periodicity of Natural Annual Runoff Rate at Sanmenxia Station

采用自相关和方差谱密度分析方法,对黄河三门峡站1470～2002年、1919～2002年和1949～2002年3个系列天然年径流量的近似周期成分进行了识别、表示和提取.研究表明:1470～2002年序列首先存在11年、其次存在3年的近似周期成分;1919～2002年和1949～2002年序列明显存在3年的近似周期成分.

The paper conducts identification,presentation and extraction on three approximate period series of natural annual runoff rate of 1470~2002,1919~2002 and 1949~2002 of Sanmenxia Station on the Yellow River by using the methods of autocorrelation and variance spectral density analysis.The study shows that the composition of approximate period exists firstly in 11 years then in 3 years in 1470~2002 series and remarkably exists in 3 years in 1919~2002 and 1949~2002 series.