基于小波分析的开都河径流变化周期研究

基于开都河1956—2010年径流量资料，采用小波分析法对开都河径流变化特征进行研究，讨论开都河年径流在不同时间尺度下的小波变换时频分布特征及其丰、枯交替变化的周期规律。研究结果表明，开都河年径流变化具有同步性，现正处于偏丰期；年内径流分配主要集中于6—8月，各站点最大月径流量均出现在7月。55 a来开都河流域大山口站年径流量呈现递增趋势，变化率为1.382 m³/s，、焉耆站年径流量呈现下降趋势，变化率为-0.113 m³/s。开都河大山口和焉耆两站20~30 a左右时间尺度的周期震荡最显著，其次，11~17 a左右时间尺度的周期震荡也较为显著；开都河流域径流量变化的主周期为27 a，次周期为16 a。

Research on Period of Annual Runoff in Kaidu River Based on Wavelet Analysis

Based on the data of annual runoff from 1956 to 2010 of the Kaidu river, the characteristics of annual runoff variation trends was researched by the method of wavelet analysis,and the periodicity and mutability were discussed, the wavelet transform analysis was jointly adopted to unravel characteristics of runoff variations of the Kaidu River. Results of wavelet analysis show that annual runoff at two stations generally presented an increasing and a decreasing trend, the change rates were 1.382 m³/s and -0.113 m³/s, respectively. Annual distributions were mainly concentrated in June to Augest; the biggest monthly runoff at Dashankou and Yanqi station both occurred in July. The runoff in 11~17 a oscillation period was most notable and it was relatively notable in 20~30 a period. Principal periods of annual runoff at the Dashankou and Yanqi stations were found to be 27 a, and the secondary periods were 16 a.