| SPEI-based analysis of temporal and spatial variation characteristics for seasonal drought in Sichuan Basin |
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| DOI：10.7606/j.issn.1000-7601.2018.05.34 |
| Key Words: seasonal drought standardized precipitation evapotranspiration index(SPEI) temporal and spatial distribution Sichuan Basin |
| Author Name | Affiliation | | ZHANG Han | Institute of Plateau Meteorology, China Meteorological Administration, Chengdu / HeavyRain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province, Chengdu， Sichuan 610072,China
Sichuan Province Agrometeorological Center ,Chengdu, Sichuan 610072,China | | ZHANG Xi-liang | Huzhou Meteorological Bureau of Zhejiang, Huzhou, Zhejiang 313000,China | | LI Jin-jian | Chengdu University of Information Technology, Chengdu, Sichuan 610225, China | | WANG Ming-tian | Institute of Plateau Meteorology, China Meteorological Administration, Chengdu / HeavyRain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province, Chengdu， Sichuan 610072,China
Sichuan Meteorological Observatory, Chengdu, Sichuan 610072, China；Provincial Key Laboratory of Water-Saving Agriculture in Hill Area of Southern China, Chengdu, Sichuan 610065,China | | MA Ze-long | Hydraulic Science Research Institute of Sichuan Province, Chengdu, Sichuan 610072,China |
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| Abstract: |
| Based on the data of monthly precipitation and temperature from 57 meteorological stations during 1961-2012, the inter-seasonal standardized precipitation evapotranspiration index (SPEI) was calculated to analyze the temporal and spatial variation of seasonal drought in Sichuan Basin. The results showed as followings. First, due to the seasonal increase in temperature and decrease in precipitation, the four seasons of Sichuan Basin tended to be dry, and it was especially typical in autumn. The meteorological data demonstrated that the increase rate of autumn temperature was 0.154℃·10 a-1 in Sichuan Basin, and the autumn precipitation was decreasing significantly by the rate of 15.22 mm·10 a-1. Second, compared to other degrees of drought, the number of moderate drought stations in autumn had the most significant increasing trend, and it was found that an increasing trend for the number of severe drought and extreme drought stations occured since the late 1990s, resulting in the enhancing impact of drought obviously. Third, there were significant spatial differences in characteristics of regional dryness/wetness distribution as well as the variation trend in the four seasons of Sichuan Basin. The obvious drought-prone areas impacted by drought severely were located in the flat-hilly areas in the west of Basin, the hilly areas in the middle of Basin, and the mild hilly areas in the south of Basin. To these regions, it was necessary to strengthen the corresponding drought prevention measures in time to avoid the influence of extreme drought events. |
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