长江科学院院报2017，Vol.34Issue(5)：5-8,4.DOI:10.11988/ckyyb.20160482
多沙河流水沙变化特征小波分析
Wavelet Analysis on Flow and Sediment Variation in Sandy Rivers
摘要
Abstract
In the aim of providing basis for the operation of sandy reservoir and reducing the influences of length and randomness of flow and sediment series,wavelet transform was adopted to analyze the variation characteristics of flow and sediment series.Standardized monthly flow and sediment series were decomposed by Multi-resolution Analysis using the db3 wavelet function,and continuous wavelet transform was used to evaluate the periodic variations of the two standardized series using the complex valued Morlet function.The flow and sediment series at the dam site of Yayangshan Hydropower Station located in Lixianjiang watershed were taken as an example.The reconstruction of the lowest frequency part revealed the trend of the flow and sediment series.According to the local rainfall and soil and water conservation,the result is considered reasonable.Wavelet variances were obtained to identify the dominant period as 2-year approximately for both flow series and sediment series and reveal the synchronization between them.The results indicate that wavelet transform is effective for nonstationary stochastic series analysis.关键词
小波变换/水沙序列/径流/含沙量/时间尺度/多分辨率分析/小波方差Key words
wavelet transform/flow and sediment series/runoff/sediment concentration/time scale/multi-resolution analysis/wavelet variances分类
天文与地球科学引用本文复制引用
邵雪杰,顾圣平,曹爱武,何海祥,于婷婷..多沙河流水沙变化特征小波分析[J].长江科学院院报,2017,34(5):5-8,4.基金项目
国家"十二五"科技支撑计划项目(2013BAB06B01) （2013BAB06B01）
