| Cite this article: | 陈正发,李靖,相彪,等.基于SPI的云南省多尺度干旱时空演变特征识别[J].灌溉排水学报,0,():-. |
| CHEN Zhengfa,LI Jing,XIANG Biao,et al.基于SPI的云南省多尺度干旱时空演变特征识别[J].灌溉排水学报,0,():-. |
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| DOI： |
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| Identification of Spatial-temporal Evolution Characteristics of Multi-scale Drought in Yunnan Province Based on SPI |
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CHEN Zhengfa, LI Jing, XIANG Biao, Duan Qingsong, Li Shufang, Wang Shufang
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College of Water Conservancy,Yunnan Agricultural University
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| Abstract: |
| 【Objective】Identifying the spatial-temporal distribution and evolution characteristics of regional drought has important guiding significance for the prevention and control of drought disasters and the formulation of scientific water and soil resources management measures. 【Methods】Based on the meteorological data of 36 meteorological stations in Yunnan Province in recent 31 years, the time-space distribution and evolution characteristics of multi-scale meteorological drought in Yunnan Province are quantitatively identified by using the standardized precipitation index (SPI) model, GIS spatial analysis, nonparametric Mann-Kendall trend test and other research methods. 【Results】The results show that (1) the SPI on annual and seasonal scales shows a fluctuating trend. Except for the slight increase trend of SPI in spring, the SPI on summer, autumn, winter and annual scales shows a slight decrease trend. The change range of SPI in autumn is the largest and that in winter is the smallest. SPI12 is distributed between -1.95 and 1.44. (2) The annual drought frequency ranges from 32.26% to 50.00%, and the dominant drought grades are mild drought and extreme drought. The high-value areas of drought frequency are distributed in Wenshan, Honghe, Kunming, Chuxiong and Dehong areas. (3) The drought frequencies in spring, summer, autumn and winter were 39.86%, 39.83%, 38.43%, and 41.33% respectively. Although the difference in drought frequency between the four seasons was small, the drought grades dominated by different seasons were quite different. Except for spring, the dominant drought level in each season includes extreme drought; the higher the drought level, the wider the drought range. (4) On the annual scale, except that the drought evolution of 5 stations shows an increasing trend, the other stations have no obvious evolution trend; The drought evolution of most stations showed a decreasing trend in spring, while 11, 6 and 2 stations showed an obvious increasing trend in summer, autumn and winter respectively. 【Conclusion】 The annual scale and seasonal scale drought frequency distribution and evolution trend in Yunnan Province have obvious heterogeneity characteristics. The regional drought is dominated by seasonal drought, among which the spring drought and winter drought are generally higher in frequency and grade. Generally speaking, the higher the drought grade is. The higher the corresponding drought range is also larger. |
| Key words: drought model; meteorological drought; seasonal drought; standardized precipitation index; Yunnan province |
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