| Cite this article: | 来和鑫,朱晓萌,张泽中,等.1960-2019年中国流域尺度干旱时空演变特征研究[J].灌溉排水学报,0,():-. |
| LAI Hexin,ZHU Xiaomeng,ZHANG Zezhong,et al.1960-2019年中国流域尺度干旱时空演变特征研究[J].灌溉排水学报,0,():-. |
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| Study on the Spatio-Temporal Patterns of Drought During 1960-2019 in Different Sub-Basins of China |
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LAI Hexin1, ZHU Xiaomeng2, ZHANG Zezhong1, WANG Fei1
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1.School of Water Conservancy,North China University of Water Resources and Electric Power;2.Guizhou Provincial Water Conservancy Research Institute
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| Abstract: |
| Under the background of climate warming, the further acceleration of the global water cycle leads to the increasing drought risk and instability, which is harmful to human production and life. In this paper, the Standardized Precipitation Evapotranspiration Index (SPEI) was used as a drought index, and the Extreme-point Symmetric Mode Decomposition (ESMD) method was used to decompose the period and trend of SPEI time series. Thus, the temporal and spatial evolution characteristics of drought were investigated in different sub-basins of China. The results indicated that: ① The temporal variation characteristics of drought were different in various sub-basins from 1960 to 2019, and the most obvious drought increasing trend occurred in the Continental River Basin, with an SPEI linear tendency rate of -0.192/10a. ② The ESMD results showed that the drought was increasing in China, with a first and second main cycle of 2.07 years and 5 years. ③ For mild drought, moderate drought, severe drought, extreme drought and drought, the average frequency was 13.5%, 10.4%, 5.5%, 2.3% and 31.8%, and the average intensity was 0.74, 1.23, 1.67, 1.86 and 1.18, respectively. ④ENSO has the closest relationship with drought, while NAO has no significant impact on drought. |
| Key words: drought; spatio-temporal patterns; Standardized Precipitation Evapotranspiration Index; China |
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