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中文摘要：
以石角站45 a的实测月径流资料为基础,研究了北江流域径流年内分配变化规律。通过计算径流年内分配不均匀性、集中程度、变化幅度等指标发现,北江径流量具有显著的洪枯季节变化,20世纪50、60年代的径流年内分配较不均匀,而70年代以来,径流年内分配较为缓和。选用db3小波函数,对各指标进行3层分解,以尺度水平3下的低频系数单支重构序列观察各指标的变化趋势,发现北江流域年内分配不均匀性指标显示为缓慢下降的趋势,尤其是70年代以后,这很可能是流域内人工水利设施对径流调节力度加大的缘故。对降雨序列的年内分配指标进行类似的分析后认为,径流不均匀系数等指标在趋势上变化的原因是流域内人工水利设施对径流的调节力度加大了。
英文摘要：
Based on the monthly runoff data for 45 years of Shijiao station on Beijiang River, the annual distribution characteristics of runoff are studied. Several indices related to the attributes of uneven, concentrate degree and amplitude of variation are calculated, and the results show that there have obvious fresh and drought seasonal changes and the runoff variation in 70＇s becomes moderate than before. Selected db3 wavelet to decompose each index for 3 - lyer, the single branch reconstruction series of low frequency coefficients in the lowest scale level show that trends of the indices of unevenness descend, especially after 70＇s. This may be the effect of strengthened manual water conservancy facilities. The analogous analysis on the indices of precipitation series draws the conclusion that the variation of the indices is the effect of regulation strengthened by the manual water conservancy works.
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