梯级水库群运行后寸滩枯水径流水文变异特性研究  

Hydrological Variation Characteristics of Cuntan in Dry Period After Operation of Cascade Reservoirs

作　　者：张燃钢 胡江[2] 徐炜[2] 杨胜发[2] 张鹏[2] ZHANG Ran-gang;HU Jiang;XU Wei;YANG Sheng-fa;ZHANG Peng(Key Laboratory of Ministry of Education for Hydraulic and Water Transport Engineering,Chongqing Jiaotong University,Chongqing 400074,China;National Engineering Research Center for Inland Waterway Regulation,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]重庆交通大学水利水运工程教育部重点实验室,重庆400074 [2]重庆交通大学国家内河航道整治工程技术研究中心,重庆400074

出　　处：《长江流域资源与环境》2022年第10期2176-2185,共10页Resources and Environment in the Yangtze Basin

基　　金：三峡后续工作科研项目(SXHXGZ-2021-1)。

摘　　要：为定量分析梯级水库群蓄水运行后对寸滩枯水期(11~4月)水文变异特性的影响,采用水文变异指标法和变化范围法(IHA/RVA)对1954~2021年寸滩站枯水期日平均流量序列的水文变异特征进行了分析,并采用重标极差R/S法对IHA指标的趋势性进行了分析。结果表明:(1)梯级水库运行后,寸滩枯水期有11个IHA指标发生高度改变,4个指标发生中度改变,9个指标发生低度改变;主要表现为枯水期月均流量和最小流量不断提升;极大流量和极小流量的发生时间提前;流量逆转次数增加。(2)水库群运行前所有IHA指标表现为无偏游走或均值回复的两种状态;而库群运行后有9个指标转变为有偏游走的持续发展趋势。(3)未来寸滩枯水期1、2月流量、最小30 d流量、最大流量和流量逆转次数将持续增加;极大和极小流量发生时间将呈均值回复的发展趋势。In order to analyse the hydrological variation characteristics of Cuntan station in dry period(November to April) after the operation of the cascade reservoirs,This study use the Indicators of Hydrologic Alteration and Range of Variability Approach(IHA/RVA) method to analyse the hydrological variation characteristics of the daily average flow series of Cuntan station from 1954 to 2021,and analyzed the trend of the IHA indicators by the Rescaled Range(R/S) method.The results as follows:(1) There are 11 indicators had height changes,4 indicators had moderate changes,9 indicators had low changes,mainly reflected in the increasing of the average monthly flow and minimum flow in dry period,the initial maximum flow occurrence time shrinks from 1-22 th November to 1-8 th November,the minimum flow occurrence times advanced nearly 20 days,and the flow reversal times increased.(2) All the trends of IHA indicators reflected in the unbiased random walk and mean-recoverting process before influenced by the reservoirs,but 9 indicators changed to biased walk after reservoirs operation.(3) In the future,the flow in January and February,the minimum 30 day flow and the flow reversal times will continue to increase,the maximum and minimum flow occurrence times will be the trend of mean-reverting process in dry period.

关 键 词：IHA-RVA R/S 水库群 寸滩站 径流特征 

分 类 号：TV211.2[水利工程—水文学及水资源]