基于小波分析的入库径流变化研究

基于桂林市青狮潭水库1958—2011年入库径流资料,采用Morlet小波分析方法对入库径流在不同时间尺度下的变换时频分布特征及丰枯变化的情况进行了分析。结果表明,青狮潭水库入库径流序列具有多时间尺度变化特性,主要存在8,15,22,32 a左右的周期变化。这4个主要周期变化,主导着青狮潭水库入库径流的趋势变化特性,尤其是以32 a的周期变化为主,入库径流大致经历了枯→丰→枯→丰→枯的变化。

Study of Inflow Runoff Variation Based on Wavelet Analysis

Based on the flow data during 1958 — 2011 ,the wavelet transform time - frequency distribution and wet and dry conditions change of inflow runoff in Qingshitan Reservoir are studied using the Morlet wavelet analysis method .The results show that the series of inflow runoff in Qingshitan Reservoir have characteristics of multiple time scales .There are mainly 8 , 15 ,22 and 32 years or so periodic variations .This four major periodic variation ,dominated the variation characteristics of trend on inflow runoff in Qingshitan Reservoir .Especially in the 32 years periodic variations ,inflow runoff roughly experi-enced the variation of dry — wet — dry — wet — dry .