摘要
为研究云南省径流年内变化特性,分析其变化的主要影响因素,以云南省6大流域9个代表水文站1956-2016年实测月年降水和径流资料为依据,基于不均匀性、集中度和相对变化幅度对径流年内分配进行分析。研究表明:①各代表站多年平均径流年内分配不均匀系数C_(u)在0.55~1.21之间,集中度C_(n)在0.23~0.66之间,全省径流存在年内分配不均匀性;②各年代径流C_(u)和C_(n)比较,总体为下降趋势,特别是2000年以后径流年内分配在逐渐向均匀化演变;③滇中长江流域和红河流域的径流集中程度较高,澜沧江流域和珠江流域径流年内分配过程有坦化现象;④径流年内过程分配均匀化趋势与流域内人类活动有密切联系。
To study the annual variation characteristics of runoff in Yunnan Province and analyze the main influencing factors,based on the observed monthly and annual rainfall and runoff data of 9 representative hydrological stations in 6 major river basins in Yunnan from 1956 to 2016,this paper analyzes the annual runoff distribution in terms of the uniformity,concentration and relative variation range.The research shows that:①The uniformity coefficient(C_(u))of runoff distribution in many years ranges from 0.55 to 1.21,and the concentration(C_(n))ranges from 0.23 to 0.66,so the runoff is unevenly distributed in the whole province.②The C(u) and C_(n) decrease in general.Especially after 2000,the annual distribution of runoff shows a trend of uniformity.③The runoff concentration is relatively high in the Yangtze River Basin and the Honghe River Basin,and the annual runoff distribution is flat in the Lancang River Basin and the Zhujiang River Basin.④The uniformity trend of annual runoff distribution is closely related to human activities in the basin.
作者
谷桂华
李学辉
余守龙
段路松
GU Guihua;LI Xuehui;YU Shoulong;DUAN Lusong(Yuxi Branch of Yunnan Hydrology and Water Resources Bureau,Yuxi 653100,China;Yunnan Hydrology and Water Resources Bureau,Kunming 650106,China;Lincang Branch of Yunnan Hydrology and Water Resources Bureau,Lincang 677000,China)
出处
《人民珠江》
2021年第3期30-36,共7页
Pearl River
基金
云南省第三次水资源调查评价项目(YNSZY-2018-04)。
关键词
径流
不均匀系数
集中度
影响因素
云南
runoff
uniformity coefficient
concentration
influencing factors
Yunnan
