Chinese Journal of Agrometeorology ›› 2015, Vol. 36 ›› Issue (03): 331-337.doi: 10.3969/j.issn.1000-6362.2015.03.011

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Risk Assessment of Agricultural Drought Disaster Based on Value at Risk Theory in Gansu Province

WANG Zhilan, WANG Jing, WANG Jinsong   

  1. Institute of Arid Meteorology, CMA/Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province/Key Laboratory of Arid Climate Change and Disaster Reduction of CMA, Lanzhou 730020, China
  • Received:2014-09-23 Online:2015-06-20 Published:2015-10-20

Abstract: he loss rate of agricultural drought was calculated, based on the data of crops area covered by drought disaster, affected by drought disaster, and no harvest by drought disaster,and crops yield data as well. The best probability model of drought loss rate was established, according to the goodness of fit test result. The agricultural drought disaster risk in Gansu province was assessed referring to value at risk (VaR) from economics and different levels of drought risk. The results showed that the effect of drought on agricultural production in Gansu province from 1950 to 2011 was relative limited, and the loss rate of agricultural drought was no more than 30%, with an average of 10%. The max loss rate occurred in 1995, with the rate of 26.8%. The best probability model of drought loss rate was generalized extreme value (GEV)model in Gansu province in last 62 years. The agricultural loss rate was 18.8% if facing drought once of ten years, 25.7% facing drought once of 50 years,and 28.3% facing drought once of 100 years.

Key words: Value at risk, Probability distribution, Goodness of fit test, Risk assessment of drought, Gansu province