Statistical Characteristics of Drought disasters in Sichuan Basin
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Abstract:
The statistical analysis of drought disasters over Sichuan Basin in recent 30 years is conducted by using the local drought standards of the Sichuan Meteorological Service (DB51/T581 2007) with the daily precipitation data of 17 cities and 103 counties from 1980 to 2009. The main results indicate that summer droughts in May and June occur most frequently in Sichuan Basin, mainly in the Chengdu plain, including Chengdu, Deyang, and Mianyang. Summer droughts in July and August occur the least frequently. The areas frequently attacked by spring droughts in March and April, summer droughts in May and June, and summer droughts in July and August are mainly distributed from northwest to southeast in the basin, and the occurrence frequency of drought disasters in the Sichuan Basin has a growing trend on the whole; especially, the occurrence frequency of severe droughts increases rapidly. The frequency in the 1990s increased 110.3% comparing with that in the 1980s, and that in the 2000s increased 20% comparing with that in the 1990s, which is 2.5 times of that in the 1980s.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.