广东水利水电Issue(6)：29-33,5.
石羊河流域西大河干旱指数演变规律分析
Analysis of the Evolution Law of Drought Index in the West River of Shiyang River Basin
摘要
Abstract
The drought index,as an important indicator reflecting the degree of climate drought,is a key parameter for revealing regional climate drought changes.This study takes the main tributary of the Shiyang River in the inland river basin of Hexi,Gansu Province,as the research object.Based on the measured data of the Xida River Reservoir hydrological station,using time series theory,multiple trend and mutation testing methods,and combined with power spectral density method,the evolution law of drought index from 1981 to 2022 was systematically analyzed.The research results indicate that the drought index showed an overall downward trend from 1981 to 2022,with a significant mutation occurring in 2010.The study period can be divided into two characteristic stages:1981-2009(high value period)and 2010-2022(low value period);The change in drought index follows a main cycle of about 10 years,and after 2020,the drought situation in the Xihe River Basin has entered a new cycle of change.关键词
干旱指数/时间序列/演变规律/西大河Key words
drought index/time series/evolutionary law/the xida river分类
天文与地球科学引用本文复制引用
朱咏,雷明宇,霍飞龙..石羊河流域西大河干旱指数演变规律分析[J].广东水利水电,2026,(6):29-33,5.基金项目
甘肃省科技计划项目软科学专项(编号:23JRZA339). （编号:23JRZA339）
