| 引用本文: | 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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| 摘要: |
| 气候变暖背景下，全球水循环的进一步加快导致干旱发生的风险和不稳定性逐渐增大，对人类生产、生活的危害日益加剧。本文以标准化降水蒸散指数SPEI作为干旱指数，采用极点对称模态分解方法ESMD将SPEI时间序列进行趋势与周期分解，对全国流域尺度上的干旱时空演变特征进行研究。结果表明：①1960-2019年各个流域的干旱时间变化特征具有差异性，其中内陆河流域的干旱增加趋势最为明显，SPEI线性倾向率为-0.192/10a；②ESMD分解结果表明全国干旱呈现出增加趋势，且第一主周期为2.07年，第二主周期为5年；③轻旱、中旱、重旱、特旱、干旱的频率均值分别为13.5%、10.4%、5.5%、2.3%、31.8%，强度均值分别为0.74、1.23、1.67、1.86、1.18。④ENSO与干旱的关系最为密切，而NAO对干旱的影响并不显著。 |
| 关键词: 干旱;时空演变;标准化降水蒸散指数SPEI;中国 |
| DOI： |
| 分类号:S166 |
| 基金项目:贵州省水利厅科技项目(KT202001),国家自然科学基金项目(52179015),华北水利水电大学研究生教育创新计划基金资助（YK-2021-45） |
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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 |
