水科学进展2025，Vol.36Issue(3)：372-382,11.DOI:10.14042/j.cnki.32.1309.2025.03.002
变化环境下骤发干旱的径流表征方法
A new approach to manifesting flash drought by streamflow under a changing environment
摘要
Abstract
Most existing studies on flash droughts have been conducted from the perspective of meteorological or agricultural droughts.In contrast,research from a hydrological drought perspective,such as research based on streamflow or base flow deficits,remains limited.To address this gap,a flash drought assessment method that accounts for the rapid development characteristics and water deficit conditions of streamflow was established on the basis of run theory and the threshold level method.Then,a digital filtering method was introduced for base flow separation to support the identification of flash droughts in base flow processes,thus complementing existing flash drought identification methods.The Ganjiang River basin was selected as a case study area to evaluate the proposed method.The results indicated that the average durations and onset rates of flash drought events identified from the streamflow and base flow series in the Ganjiang River basin from 1981 to 2020 were 8.40 and 9.92 pentads and 20.15 and 24.40％/pentad,respectively.Validation of the changes in key hydro-meteorological variables suggested that flash droughts characterized on the basis of streamflow performed better in capturing the initial stage of soil moisture flash drought transmission into the watershed streamflow process,whereas the base flow characterization method for flash droughts was more reliable for determining whether a flash drought event had been completely terminated within the basin water cycle process.关键词
骤发干旱/径流/基流分割/干旱评估/阈值方法/赣江流域Key words
flash drought/streamflow/base flow separation/drought assessment/threshold level method/Ganjiang River basin分类
天文与地球科学引用本文复制引用
王孟浩,江善虎,任立良,徐俊增,袁山水..变化环境下骤发干旱的径流表征方法[J].水科学进展,2025,36(3):372-382,11.基金项目
国家自然科学基金项目(52409019) （52409019）
江苏省自然科学基金项目(BK20241515) The study is financially supported by the National Natural Science Foundation of China(No.52409019)and Natural Science Foundation of Jiangsu Province,China(No.BK20241515). （BK20241515）
