摘要
针对小波变换的不足之处,以及河川径流变化所具有的复杂多时间尺度性和不确定性,为深入研究河流之间年径流量变化的关系,以汾河河津水文站和沁河武陟水文站为例,首先运用EMD方法对二者1956年—2000年还原后的天然径流量时序进行多时间尺度分解,得到具有不同周期的波动分量;再运用SPA方法对由此得到的集对进行研究.结果表明,汾河与沁河年径流量变化关系的同、异、反特性具有显著的时间尺度性,即二者的同一性主要体现在短周期尺度水平上,差异性主要体现在中短周期尺度水平上,对立性主要体现在中长周期尺度水平上.
Through analyzing problem of wavelet transform and then complicated muhiple time-scale and uncertainty characteristics of runoff time series fluctuation, to analyze deeply fluctuation relationship of annual runoff time series between rivers, the natural annual runoff time series from 1956 to 2000 of Hejin hydrological station on the Fenhe River and Wuzhi hydrological station on the Qinhe River are decomposed into muhiple time-scale series with original empirical mode decomposition (EMD) method to obtain fluctuation components with different periods, the decompositions show that there are about 2-4, 8, 15, and 40 years periods for Fenhe River and about 2-4, 6-8, 10-12, and 32 years for Qinhe River. Then set pair analysis(SPA) method is applied to study the resulted set pairs, the results show that the relationship characteristics of annual runoff fluctuations between Fenhe River and Qinhe River, such as homology and opposition, change with different time-scale apparently, namely, the homology is represented through short time scale level, the difference is represented through middle-short time scale level and the opposition is represented through middle-long time scale level.
出处
《应用基础与工程科学学报》
EI
CSCD
2009年第5期716-724,共9页
Journal of Basic Science and Engineering
基金
国家自然科学基金(50579049)