Journal of Yangtze River Scientific Research Institute ›› 2021, Vol. 38 ›› Issue (12): 25-32.DOI: 10.11988/ckyyb.20200812

• WATER RESOURCES • Previous Articles     Next Articles

Drought Frequency Analysis of Inconsistent Sequences Based on Copula Function under Hydrological Alteration: Case Study on Poyang Lake

XU Bin1,2, YUAN Zhe1,2, SUN Ke-ke1,2, YAN Bo1,2   

  1. 1. Water Resources Department, Yangtze River Scientific Research Institute, Wuhan 430010, China;
    2. Hubei Provincial Key Laboratory of Water Resources and Eco-environmental Sciences,Wuhan 430010, China
  • Received:2020-08-11 Revised:2020-12-02 Online:2021-12-01 Published:2021-12-15

Abstract: Affected by the changing environment, the inconsistency of time series has posed increasing impact on drought frequency analysis, which, however, lacks consideration of such inconsistency. We propose to analyze drought frequency in consideration of the inconsistency of time series under the circumstance of hydrological alteration by diagnosing the variations of time series, extracting drought variables, and constructing Copula joint distribution function. With the Poyang Lake as the study object, we examine the monthly water level series from 1955 to 2015 of Hukou station by the proposed method. Results manifest that downward alteration of water level series occurred in 2003, after which the drought duration and drought intensity escalated, and the return period of drought events with the same frequency plunged. Water resources management departments in the Poyang Lake area should adjust timely the countermeasures to drought events to respond to the challenges posed by hydrological alteration.

Key words: hydrological alteration, inconsistency, Copula function, drought frequency, Poyang Lake

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