Acta Geographica Sinica ›› 2006, Vol. 61 ›› Issue (1): 47-56.doi: 10.11821/xb200601005

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Structure and Long-term Memory of Discharge Series in Yangtze River

WANG Guojie1,2, JIANG Tong1, CHEN Guiya3   

  1. 1. Nanjing Institute of Geography and Limnology, CAS, Nanjing 210008, China;
    2. Graduate School of Chinese Academy of Sciences, Beijing 100039, China;
    3. Bureau of Hydrology, Changjiang Water Resources Commission, Wuhan 430010, China
  • Received:2005-08-11 Revised:2005-11-03 Online:2006-01-25 Published:2010-09-06
  • Supported by:

    Knowledge Innovation Project of CAS, No.KZCX3-SW-331; National Natural Science Fund, No.40371112

Abstract:

Based on the long-term monthly discharge series of Yichang, Hankou and Datong stations, this paper has explored the discharge series structure of periodicity, trend and abrupt changes as well as its long-term momery with Singular Spectum Analysis, and Detrended Fluctuation Analysis in employment. The results revealed that: 1) there is a significant 15a periodicity in the discharge series of the Yangtze River, and the 15a periodicity has been disturbed since the 1970s; 2) two abrupt and negative changes of Yichang series respectively in 1926 and 1970 have been detected in Hankou series in 1954; two abrupt changes occurred in Datong series respectively in 1955 and 1988, the former negative and the latter positive; and 3) the performance of DFA revealed a long memory in the discharge series of the Yangtze River, and the larger the upslope contributing area is, the stronger the long memory, which exhibits a cumulative effect.

Key words: discharge series, time series structure, long-term memory, Yangtze River