JOURNAL OF NATURAL RESOURCES ›› 2011, Vol. 26 ›› Issue (9): 1496-1505.doi: 10.11849/zrzyxb.2011.09.005

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Evolutive Characteristics and Differentiation Rules of Agricultural Flood in Dongting Lake Basin from 1950 to 2009

LI Jing-bao1, HU Wei1, YIN Hui2, MAO De-hua1, ZENG Fa-ming1, DENG Chu-xiong1, DAI Yong1   

  1. 1. College of Resources and Environment Science, Hunan Normal University, Changsha 410081,China;
    2. Institute of Karst Geology, CAGS, Guilin 541004,China
  • Received:2010-08-30 Revised:2011-07-05 Online:2011-09-20 Published:2011-09-20

Abstract: Dongting Lake Basin is an important agricultural production area in China, however agricultural flood remains obstruction factors in restricting agricultural sustainable development. Based on the flood data from 1950 to 2009, by using the measurable and qualitative methods, the paper analyzes the evolutive characteristics and regional differentiation of agricultural flood in Dongting Lake Basin. The results show that: 1) Annual frequent basin-wide or regional agricultural floods present mountain torrent disasters, among them, disastrous floods and extraordinary floods present increasing trend. 2) Long-term span evolutive process abnormal indices of flood disasters present two wave crest periods and four trough periods, abnormal indices of flood suffering present three wave crest periods and three trough periods. Rates of flood disaster and flood suffering present isochronous changes, but the short-term span has varied in different stages of the inverse relationship between rates of flood disaster and flood suffering. 3) Agricultural flood has mutations, but the characteristics of total evolutive trends present rise. 4) According to disaster environment, flood causing factors, and the level of economic development, the relative and absolute disaster condition of agriculture differs regionally from east to west, and north to south, on aspects of time and space.

Key words: agricultural flood, abnormal indices of flood disasters, abnormal indices of flood suffering, Dongting Lake Basin

CLC Number: 

  • S422