摘要
大汶河流域河川天然径流量具有年内变化不均、年际变化幅度大的特点,为分析河川天然径流的演变规律,本文应用累积距平法、Mann-Kendall法、小波分析等多种方法对大汶河流域53年的河川天然径流的变化趋势、突变特征以及周期特性进行了研究。分析结果表明:流域河川天然径流量略呈下降趋势,且存在阶段性变化特征,并于60年代中期达到突变水平;对天然径流序列的小波分析表明,主要存在2个尺度的周期变化,现阶段处于5年尺度下的相对枯水期。
The inter-annual and annual changes of natural runoff of Dawen river basin changes obviously. In order to analyze the natural runoff law, some methods, such as the accumulative anomaly method, Mann-Kendall method, and wavelet analysis method, are used in this paper to study the variation tend, abrupt change and period of natural runoff in past 53 years. The results show that the natural runoff is on the downside, changes periodically and arrives at the level of abrupt change level in the middle of 1960s. It has two primary scales periodical change and it is in the dry season on the scale of 5 years.
出处
《节水灌溉》
北大核心
2010年第6期18-20,25,共4页
Water Saving Irrigation
关键词
大汶河
天然径流
变化趋势
突变
Da wen river
natural runoff
variation tend
abrupt change
