摘要
为探究嘉陵江流域骤发干旱可识别特性与时空演变特征,基于标准化蒸发胁迫比研究了1980—2020年嘉陵江流域骤发干旱的时空分布特征,通过密度聚类算法提取骤发干旱斑块分析了斑块质心的轨迹变化,并探讨了骤发干旱暴发初期气象要素的异常情况。结果表明:流域西北部骤发干旱强度更高且发展速度更快,流域南部骤发干旱持续时间更长;流域骤发干旱事件主要发生在4—11月,且骤发干旱事件的质心主要沿东北和西北方向迁移;嘉陵江流域的骤发干旱主要由高温和降水共同主导。
To explore the identifiable characteristics and spatiotemporal evolution features of flash droughts in the Jialing River Basin,the spatiotemporal distribution characteristics of flash drought in the basin from 1980 to 2020 was analyzed based on the standardized evaporative stress ratio.Utilizing a density-based clustering algorithm,flash drought patches were extracted and the trajectory changes of the centroids were analyzed.In addition,the abnormal changes of meteorological elements during the outbreak of flash drought were explored by combining meteorological data.The results show that in the northwestern region of the Jialing River Basin,flash droughts exhibit higher intensity and faster development rates,while longer durations exist in the southern part of the basin.The main occurrence of flash drought in the Jialing River Basin is from April to November.The centroids of flash drought events in the basin predominantly migrate towards the northeast and northwest directions.The flash drought in the Jialing River Basin is primarily dominated by a combination of high temperature and precipitation.
作者
孟长青
董子娇
刘柯莹
王远坤
张验科
钟德钰
MENG Changqing;DONG Zijiao;LIU Keying;WANG Yuankun;ZHANG Yanke;ZHONG Deyu(School of Water Resources and Hydropower Engineering,North China Electric Power University,Beijing 102206,China;State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China)
出处
《水利水电科技进展》
CSCD
北大核心
2024年第4期23-30,58,共9页
Advances in Science and Technology of Water Resources
基金
国家自然科学基金项目(41901028,52279064)。
关键词
骤发干旱
标准化蒸发胁迫比
密度聚类算法
质心迁移
时空演变
嘉陵江流域
flash drought
standardized evaporative stress ratio
density-based clustering algorithm
centroid migration
spatial and temporal evolution
Jialing River Basin
