摘要
为了更加科学地体现河流生态流量的季节性变化规律,本文在考虑年内分配不均对生态流量影响的基础上,基于渭河流域1950—2018年月径流序列资料,采用Zenga指数计算径流年内分配均匀度,用水文综合诊断系统对月径流Zenga指数序列进行变异点诊断并分析其成因,采用广义极值分布函数(GEV)确定各月生态流量。结果表明:林家村、魏家堡、临潼3个站的径流年内分配均匀度Zenga指数序列均有显著减少趋势,变异点分别为1972年、1972年、1993年;咸阳和华县站的Zenga指数序列分别在1972和1988年发生跳跃变异;变异后5个站的生态需水满足率降低,非汛期下降幅度较汛期大。经与Tennant法比较,在考虑径流年内分配均匀度变异的基础上进行河道内生态流量计算是可行、合理的。该成果可为渭河流域生态流量计算提供一种新依据。
In order to reflect the seasonal changes of river ecological flow more scientifically,based on the influence of uneven distribution during the year on ecological flow,this paper proposes the application of Zenga index to analyze the annual distribution uniformity of runoff based on the monthly runoff sequence data of Weihe River Basin from 1950 to 2018,and then it applies the hydrological comprehensive diagnosis system to analyze the variation of the homogeneity Zenga index series and to explore the physical origin.Finally,the generalized extreme value distribution function(GEV)is used to determine the ecological flow of each month.The results indicate that:The runoff annual homogeneity Zenga index series decreased significantly at Linjiacun,Weijiapu and Lintong Station in 1972,1972 and 1993,taking a hop mutation at Xianyang and Huaxian Stations in 1972 and 1988.After variation,the satisfaction rate of ecological water requirement of each station decreases,and the decline range is larger in non-flood season than in flood season.Compared with Tennant method,it is feasible and reasonable to calculate the ecological flow within the channel on the basis of considering the variation of the runoff annual homogeneity.These results can provide a new basis for the calculation of ecological flow within the Weihe River Basin.
作者
刘铁龙
刘艳
汪雅梅
罗军刚
解建仓
LIU Tielong;LIU Yan;WANG Yamei;LUO Jungang;XIE Jiancang(River and Reservoir Administration of Shaanxi Province,Xi’an 710018,China;State Key Laboratory of Eco-hydraulics in Northwest Arid Region,Xi’an University of Technology,Xi’an 710048,China)
出处
《西安理工大学学报》
CAS
北大核心
2020年第2期188-196,共9页
Journal of Xi'an University of Technology
基金
国家自然科学基金资助项目(51709222)
国家重点研发计划资助项目(2016YFC0401409)
陕西省水利科技计划资助项目(2018slkj-4)。
关键词
年内分配
Zenga指数
变异诊断
生态流量
annual distribution homogeneity
Zenga index
variation analysis
ecological flow
