According to meteorological datasets from 1961 to 2005,we selected drought days,relative wetness index,standard precipitation index, temperature anomaly and percentage of sunlight anomaly as evaluation indices of drought.Based on the method of information diffusion,level standards of agricultural drought that correspond to different evaluation indices were established.Then we assessed drought in Sichuan Basin during 1961-2006 with the fuzzy comprehensive evaluation method,and gave the drought occurrences frequency of each city.The results showed that severe spring drought,severe summer drought and extremely severe late-summer drought occurred in Sichuan Basin in 2006.Late-summer drought occurred in all the 17 cities,of which 13 cities witnessed extremely severe late-summer drought in the Basin.On average,the sparse precipitation weather occurred about once every 30 years in late summer.High-temperature occurred once every 60 years.About 29%of stations encountered the shortage of precipitation,and 90% of stations encountered high temperature,which occurred once over 50 years.Spring drought and summer drought mostly occurred in northwest and south of Sichuan Basin,about once per 2.5 years,late-summer drought mostly occurred in east of Sichuan Basin,about once per 2 years.
ZHANG Shun-qian, HOU Mei-ting, WANG Su-yan
. The Drought Assessment of Sichuan Basin Based on Information Diffusion and the Fuzzy Comprehensive Evaluation Method[J]. JOURNAL OF NATURAL RESOURCES, 2008
, 23(4)
: 713
-723
.
DOI: 10.11849/zrzyxb.2008.04.019
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