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中文摘要：
西江是珠江流域的主要水系。本文以西江流域高要站1957-2007年径流量的年序列资料为基础，通过Mann—Kendall方法表明，西江流域的径流量在统计意义上无变化趋势。进一步采用小波变换的方法，识别西江流域的径流演变特性，小波分析表明西江流域的多年径流量存在三类尺度周期性变化规律，即西江流域多年径流量的主周期为10a、38a和48a。
英文摘要：
The Xijiang River is one of the important rivers in the Pear River Basin. According to the annual runoff time series at the Gaoya Station of the Xijiang River Basin from 1957 to 2007, there was no runoff change tendency in statistical significance based on the Mann-Kendall method. This paper used the wavelet transformation method to distinguish the runoff evolution characteristics of the Xijiang River Basin. Wavelet analysis shows that the annual runoff varies mainly in three time scale, namely 10, 38 and 48 years. Therefore, the principal periods of annual runoff of the Xijiang River Basin are 10, 38 and 48 years.
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