Acta Geographica Sinica ›› 2019, Vol. 74 ›› Issue (3): 557-571.doi: 10.11821/dlxb201903012

• Climate Change and Surface Process • Previous Articles     Next Articles

Identification of hydrologic drought characteristics under water system connectivity variation in river system of three outlets of Jingjiang river

Wen DAI1,2(), Dianqing LU1(), Jingbao LI1, Jinfeng WANG2, Zengyou ZHAO2   

  1. 1. College of Resources and Environment Science, Hunan Normal University, Changsha 410081, China
    2. School of Tourism and History and Culture, Liupanshui Normal University, Liupanshui 553004, Guizhou, China
  • Received:2017-12-27 Revised:2018-11-12 Online:2019-03-25 Published:2019-03-19
  • Supported by:
    National Natural Science Foundation of China, No.41571100;Hunan Key Discipline Construction Project, No.2011001


Based on the monthly runoff data of five stations in three outlets of Jingjiang river from 1956 to 2016, hydrologic drought characteristic variables were identified by run length theory. The probability distribution functions of drought duration, drought intensity and peak value were selected by Kolmogorow-Smirnov's goodness test. A Copulas function was constructed to deeply study the river hydrologic drought characteristics after the river connectivity variation in this region. The results showed that: (1) The year 1989 was the break point of the river system connectivity in three outlets of Jingjiang river (1956-2016). (2) The hydrologic drought characteristics changed significantly before and after river system connectivity break point. The frequency, duration, intensity and peak value of hydrologic drought increased. (3) The two-dimensional joint recurrence periods under the same single variable recurrence period in the pre-variation era in each site were much longer than those in the post-variation era but the two-dimensional co-occurrences return periods of pre-variation were shorter than those of post-variation. (4) The hydrologic drought duration, drought intensity and peak value in river system of the three outlets in Jingjiang river showed an increasing trend after river system connectivity variation. Under the same single variable recurrence period, the drought duration was longer, the drought intensity was greater and the peak value was higher. (5) The magnitude of hydrologic drought characteristics was different before and after variation of river system connectivity, and the variation ranges of hydrologic drought characteristics were different in different river systems.

Key words: hydrologic drought, drought characteristics, Archimedean Copulas function, river system connectivity variation, three outlets of Jingjiang river