水资源与水工程学报2026，Vol.37Issue(3)：66-73,8.DOI:10.11705/j.issn.1672-643X.2026.03.08
1961-2020年西南地区干旱特征的时空演变
Spatiotemporal variation of drought characteristics in southwest China from 1961 to 2020
摘要
Abstract
To reveal the spatiotemporal evolution patterns of drought characteristics in southwest China,this study selects the standardized precipitation evapotranspiration index(SPEI)as the drought indicator based on CHM_Drought dataset.Wavelet analysis and run theory were employed to analyze the spatiotemporal dif-ferentiation patterns of multidimensional drought features in southwest China from 1961 to 2020.The results indicate that the drought frequency in southwest China was 13.3%,with 2009 being the most severe drought year,and Guizhou Province exhibiting the highest drought frequency.Drought variations followed 18-year and 3-year principal cycles,suggesting a long-term drying trend and short-term wetting trend in the region.Regional droughts were predominantly mild to moderate,with relatively severe drought events in spring and autumn.Frequency of drought months showed a higher incidence in the east than in the west,while duration was greater in the west than in the east.High-intensity drought zones concentrated in north-west Sichuan and north Guizhou.Regional droughts presented a significant spatial differentiation pattern.Yunnan Province experienced frequent extreme droughts in summer and autumn;Guizhou suffered from se-vere drought events in summer and winter;Sichuan exhibited severe spring droughts;Chongqing demonstra-ted balanced seasonal drought patterns;and Tibet Autonomous Region faced prominent risks of cold-season extreme droughts.Precipitation exhibited the most pronounced effect on regional drought,with seasonal droughts primarily determined by temperature,precipitation,and total radiation.关键词
标准化降水蒸散发指数(SPEI)/游程理论/时空演变/小波分析/干旱特征/西南地区Key words
standardized precipitation evapotranspiration index(SPEI)/run theory/spatiotemporal varia-tion/wavelet analysis/drought characteristics/southwest China分类
天文与地球科学引用本文复制引用
王子轩,黄克威,林杉,胡兆永..1961-2020年西南地区干旱特征的时空演变[J].水资源与水工程学报,2026,37(3):66-73,8.基金项目
科技基础资源调查专项(2022FY100205) （2022FY100205）
国家自然科学基金项目(42201146) （42201146）
大学生创新创业训练计划项目(202610610098) （202610610098）
