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周期性和长程相关性是河川径流序列演变和波动的重要特性。论文以泾河流域杨家坪、雨落坪和张家山三个水文站1956—2001年天然径流序列为研究对象,采用功率谱周期和去趋势波动分析方法对天然径流序列进行分析,结果表明:1张家山、杨家坪和雨落坪站的天然径流序列均为“白噪声”过程,且具有0.05置信水平下显著的2.2 a周期,径流量与降水量有较好的相关性;2三个水文站的天然径流具有相同的标度不变区间(τ介于6~30个月),标度指数α分别为0.549 3(张家山)、0.555 2(雨落坪)、0.554 9(杨家坪),均大于0.5,表明三个水文站的天然径流具有长程相关性(持久性),可能影响着径流2.2 a显著周期的形成。
Periodic and long-range correlations are important characteristics of the evolution and fluctuation of river runoff sequences. In this paper, the natural runoff sequences of Yangjiaping, Yulongping and Zhangjiashan Hydrological Station from 1956 to 2001 in Jinghe River Basin are taken as the research object. The natural runoff series are analyzed by power spectrum period and trend-removing fluctuation analysis. The results show that: The natural runoff sequences of Jiashan, Yangjiaping and Yupingping stations are both “white noise” and have a significant 2.2 a period at 0.05 confidence level. There is a good correlation between runoff and precipitation. 2 Three hydrological The natural runoff of stations has the same scale invariant interval (τ between 6 and 30 months), and the scale indices α are 0.549 3 (Zhangjiashan), 0.555 2 (Yupingping), 0.554 9 (Yangjiaping) Were all greater than 0.5, indicating that the natural runoff of the three hydrological stations has long-range correlation (persistence) and may affect the formation of a significant period of 2.2 a of runoff.