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<p>Drought-flood abrupt alternation events (DFAAEs) pose growing risks to ecosystems and socio-economic systems in Southwest China. A daily-scale drought-flood abrupt alternation index (DSDFAAI) was developed using observations from 124 meteorological stations (1961–2024), and its applicability for regional detection was evaluated. Based on DSDFAAI, the spatiotemporal characteristics of DFAAEs were quantified across multiple time scales. Results indicate that drought-to-flood transitions predominated and occurred mainly during May-September. The warm-season frequency of DFAAEs showed a slight but statistically insignificant upward trend. Most events were mild, whereas moderate-to-severe flood-to-drought transitions were rare. Spatially, DFAAEs were more frequent in eastern Southwest China, with hotspots in Chongqing and Guizhou. These findings provide an observational basis for improving DFAAEs monitoring and early warning and for developing targeted risk reduction strategies in Southwest China.</p>

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Spatiotemporal variability of drought-flood abrupt alternation events in Southwest China during 1961 to 2024

  • 期刊论文

  • 发表日期：

    2026年1月26日

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  • Xiehui Li,
  • Shangru Li,
  • Lei Wang,
  • Xuejia Wang,
  • Jian Huang

摘要

Drought-flood abrupt alternation events (DFAAEs) pose growing risks to ecosystems and socio-economic systems in Southwest China. A daily-scale drought-flood abrupt alternation index (DSDFAAI) was developed using observations from 124 meteorological stations (1961–2024), and its applicability for regional detection was evaluated. Based on DSDFAAI, the spatiotemporal characteristics of DFAAEs were quantified across multiple time scales. Results indicate that drought-to-flood transitions predominated and occurred mainly during May-September. The warm-season frequency of DFAAEs showed a slight but statistically insignificant upward trend. Most events were mild, whereas moderate-to-severe flood-to-drought transitions were rare. Spatially, DFAAEs were more frequent in eastern Southwest China, with hotspots in Chongqing and Guizhou. These findings provide an observational basis for improving DFAAEs monitoring and early warning and for developing targeted risk reduction strategies in Southwest China.