Journal of Ecology and Rural Environment ›› 2017, Vol. 33 ›› Issue (4): 332-340.doi: 10.11934/j.issn.1673-4831.2017.04.006

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Characteristics of Spatio-Temporal Variation of Abrupt Alternation of Drought and Flood in Shanxi Province During Summers in 1961-2013

LIU Yu-feng1, YUAN Zhi-hua2, GUO Ling-xia1, KONG Wei3, ZHANG Li4, WU Lin5   

  1. 1. College of Resources and Environment & History and Culture, Xianyang Normal University, Xianyang 712000, China;
    2. College of Economics and Management, Xianyang Normal University, Xianyang 712000, China;
    3. Research Center of Ecological Construction and Industrial Development, Hebei North University, Zhangjiakou 075000, China;
    4. Northwest Institute of Historical Environment and Socio-Economic Development, Shaanxi Normal University, Xi'an 710062, China;
    5. The Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Shijiazhuang 050021, China
  • Received:2016-05-17 Online:2017-04-25 Published:2017-04-01

Abstract:

The research on abrupt alternation of drought and flood is of important significance to regional agricultural production and the campaigns of flood control and drought relief in summer. Summer drought-flood abrupt alternation index (DFAI) is calculated based on the data of monthly precipitations in the summers of 1961-2013 recorded in the 16 weather stations in Shanxi Province. Spatio-temporal variation of the abrupt alternations of drought and flood is characterized through Linear Tend Analysis, Mann-Kendall Test and Inverse Distance Weighted Interpolation (IDW) of the data. Results show as follows: (1) The overall variation of DFAI in Shanxi Province during the period presented an insignificant declining trend. The events of abrupt shift from flood to drought or vice versa occurred mainly around the 1970s, and during that period of years DFAI intensity also exhibited an insignificant declining trend which means the events of drought-flood abrupt alternation decreased in intensity; (2) DFAI is an index that reflects changes in precipitation in the summer periods from May to June and from July to August in Shanxi Province. The positive/negative values or negative/positive values of DFAI during the periods of May-June and July-August indicated shift from flood to drought or vice versa during the summer periods; (3) DFAI and DFAI intensity experienced abrupt change in 1978 and 2005, respectively. (4) In 1976, a typical year of abrupt shift from drought to flood, the regions high in DFAI were found in the northeastern, central eastern and southwestern parts of Shanxi Province, while in 2002, a typical year of abrupt shift from flood to drought, and the regions high in absolute DFAI value were in the central part of Shanxi Province. Spatially, the variation of DFAI exhibited a sharp difference between north and south of the Province. (5) The events of abrupt shift from drought to flood occurred mainly in the northeast, middle-west and southwest of Shanxi Province, while those from flood to drought displayed a valley-like curve along a belt from the northeast to the southwest of Shanxi Province.

Key words: Shanxi Province, drought-flood abrupt alternation, spatio-temporal change, abrupt change

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