水土保持研究2025，Vol.32Issue(4)：155-167,13.DOI:10.13869/j.cnki.rswc.2025.04.041
西汉水流域降水时空变化特征及区域差异研究
Study on the spatiotemporal variation characteristics and regional differences of precipitation in the Xihan River Basin
摘要
Abstract
[Objective]The aim of this study is to explore the distribution of precipitation at different spatiotemporal scales,providing theoretical support for water resource management and climate change adaptation in the Xihan River Basin.[Methods]Based on the monthly measured precipitation data in the Xihan River Basin as the foundational data from 1976 to 2022,methods including the Gini coefficient,Lorenz asymmetry coefficient,ITA innovative trend method,Pettitt test,and empirical orthogonal function(EOF)method were used to analyze the annual distribution characteristics,interannual trends,abrupt changes,continuity,periodicity,and spatiotemporal evolution features of precipitation in the basin.[Results](1)The annual precipitation distribution in the Xihan River Basin was extremely uneven,characterized by abundant precipitation in summer and minimal precipitation in winter.The annual precipitation showed a slight upward trend,with an average precipitation tendency rate of 3.893 mm/10 a,with precipitation expected to continue rising in the near future.(2)Multi-year precipitation exhibited significant spatiotemporal differences,with an abrupt change occurring in 1993.Precipitation exhibited significant periodic variations in the basin,with main cycles of 8 years,17 years,and 23 years in the upper,middle,and lower reaches,respectively.(3)Precipitation showed a regional distribution pattern,with less in the upper reaches and more in the lower reaches.There were two modes and four types of precipitation manifestation patterns in the basin's annual precipitation fields.The variance contribution rates of the two modes were 79.67%and 11.48%,with corresponding years of 41 years and 5 years.[Conclusion]The spatiotemporal variation in precipitation in the Xihan River Basin is influenced by both unique topographical factors and extreme precipitation events.When formulating water resource management and flood-drought prevention strategies in the basin,the precipitation variation patterns should be fully considered to enhance the ability to respond to climate change.关键词
西汉水流域/降水/变化特征/经验正交函数分解/区域差异Key words
Xihan River Basin/precipitation/variation characteristics/empirical orthogonal function decomposition/regional differences分类
天文与地球科学引用本文复制引用
高国琰,孙栋元,陈学林,王兴繁,武兰珍,马亚丽,舒和平,崔艳强..西汉水流域降水时空变化特征及区域差异研究[J].水土保持研究,2025,32(4):155-167,13.基金项目
甘肃省高等学校青年博士资助项目(2022QB-070) （2022QB-070）
甘肃农业大学科技创新基金—青年导师扶持资助项目(GAU-QDFC-2021-16) （GAU-QDFC-2021-16）
甘肃省水利科学试验研究与技术推广项目(23GSLK084,23GSLK088,甘水科外发[2017]76号). （23GSLK084,23GSLK088,甘水科外发[2017]76号）
