基于小波变换的韩江年径流多时间尺度演变特征分析

Multiple Time Scales Analysis of Annual Runoff Series Based on Wavelet Transform in Hanjiang River

运用小波分析的多分辨率功能,对韩江近62年年径流多时间尺度演变特征进行分析。结果表明:韩江年径流演变过程存在明显的多时间尺度特征,在不同的时间尺度分辨率下,会表现出不同的周期交替现象,主要存在17年、12年、7年及4年左右的振荡周期。径流量在整个研究时域内主要经历了6次丰枯交替变化,从中尺度来看,未来几年可能会出现持续来水偏少的状况。

Based on Wavelet Transform Method , the annual runoff time series data of recent 62 years in Hanjiang River has been analyzed , and it is shown that the annual runoff evolution process is with multiple time scales features .It has high and low periods . The major periods are about 17 years, 12 years, 7 years and 4 years.It interchanges periodic law between the wet period and the drought period by 6 times.By this law, Hanjiang River will be low inflow in the coming years .