水资源与水工程学报2026，Vol.37Issue(3)：1-10,10.DOI:10.11705/j.issn.1672-643X.2026.03.01
基于蒸发胁迫和土壤湿度的长江流域骤旱时空演变特征
Spatiotemporal evolution characteristics of flash droughts in the Yangtze River Basin based on evaporative stress and soil moisture
摘要
Abstract
Flash droughts,characterized by sudden onset,poor predictability,and great damage,sub-stantially impact both natural ecosystems and socio-economic activities.Understanding the spatiotemporal evolution of such events in the Yangtze River Basin is crucial for informing regional disaster management.Focusing on the Yangtze River Basin,we used GLEAM v4.1 evapotranspiration and soil moisture data during 1980-2023 to identify flash droughts and analyze their spatiotemporal evolution based on stand-ardized evaporative stress ratio and soil moisture percentiles methods.The flash droughts identified by these two methods differ considerably in frequency,duration,and intensity.Evaporative stress-based flash droughts occur most frequently in the northwestern upper reaches with a significant rising trend.Their average duration is 6-7 pentads with primarily mild and moderate intensity.In contrast,soil mois-ture-based flash droughts are concentrated in the middle and lower reaches with a significant increasing trend.Their average duration is 8-11 pentads with predominantly extreme intensity,which continues to increase significantly.Evaporative stress-based drought characteristics exhibit strong spatial consistency,whereas soil moisture-based droughts show inevident spatial consistency.These findings highlight the dif-ferent response features of atmospheric and soil moisture components during flash drought events,thus providing references for establishing a regional monitoring and early warning system to enhance drought resilience in the Yangtze River Basin.关键词
骤旱/蒸发胁迫/土壤湿度/时空演变特征/长江流域Key words
flash drought/evaporative stress/soil moisture/spatiotemporal evolution characteristics/the Yangtze River Basin分类
天文与地球科学引用本文复制引用
刘梦飞,江善虎,王孟浩,曾莉萍..基于蒸发胁迫和土壤湿度的长江流域骤旱时空演变特征[J].水资源与水工程学报,2026,37(3):1-10,10.基金项目
国家自然科学基金项目(52479009、52409019) （52479009、52409019）
江苏省自然科学基金项目(BK20241515) （BK20241515）
