Study about application analysis of drought index in Sichuan Province
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Abstract:
Drought disaster was frequently occurred, which seriously restricted agricultural development of Sichuan Province. Selecting of drought index is very important in order to reasonably analyze drought situation of Sichuan Province. Based on daily meteorological data from 1960 to 2013 of 39 meteorological stations of Sichuan Province, Relative Humidity Index, Composite Index of Meteorological Drought , Standardized Precipitation Index and Standardized Precipitation- Evapotranspiration Index were calculated in 1961, 1994, 2006 and 2009～2010. Inverse distance interpolation of Arcgis was used, and spatial distribution was obtained. Application of four drought indexes in Sichuan Province were evaluated which were compared with records of drought disaster in China’s weather disaster. Results showed that: for summer drought in 1961, the moisture index M and comprehensive drought index CI showed no or slight drought,SPI index monitored results were smaller than the actual situation and SPEI index showed the hardest hit which is the best index for monitoring the drought. For the summer drought in summer, M index monitoring results showed smaller, CI index showed vacancy and were smaller in Eastern Sichuan and Western Sichuan, SPEI index showed smaller in Bazhong and Daxian, and SPI index in Chengdu and Mianyang area; For drought in 2006, M index monitoring results weresmall, and CI index werea little better which werestill smaller than actual situation, the monitoring results of SPI and SPEIwereaccordance with actual situation; For the 2009 to 2010 winter and spring drought, SPEI was the best index, M index followed and SPI index was the worst. In a word, SPEI was the best drought index reflecting the spatial distribution of drought in Sichuan Province.
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