梯级水库调度影响下沅江入洞庭湖径流量演变特征分析  

Analysis on evolution of runoff entering into Dongting Lake from Yuanjiang River under influence of cascade reservoirs dispatch

作　　者：陈继祖 许斌[2] 孙可可[2] CHEN Jizu;XU Bin;SUN Keke(Changde Reservoir Resettlement Affairs Centre,Changde 415000,China;Water Resources Department,Changjiang River Scientific Research Institute,Wuhan 430010,China)

机构地区：[1]常德市库区移民事务中心,湖南常德415000 [2]长江科学院水资源综合利用研究所,湖北武汉430010

出　　处：《水利水电快报》2021年第2期8-11,19,共5页Express Water Resources & Hydropower Information

摘　　要：为精准识别各入洞庭湖水系水量变化对洞庭湖径流特征的影响,选取沅江作为研究对象,以桃源水文站1966~2018年的流量序列为基础,采用水文变异诊断系统,对梯级水库联合调度下沅江入洞庭湖径流量的演变特征进行分析。结果表明:在梯级水库联合调度影响下,加之流域河道外用水的不断增加等因素,在年际演变特征上,1~5月径流整体呈现中变异和弱变异,沅江年均流量总体呈现出减少的态势;在年内分配演变特征上,沅江径流的年内分配变化趋势不显著。研究成果可为沅江流域水库群的调度运行等精细化管理提供一定的依据,也可为洞庭湖其他来水分析提供一定参考。To accurately identify the impact of water volume change in the river system of Dongting Lake on its run⁃off characteristics,we selected the Yuanjiang River as our research subject,and employed the hydrological varia⁃tion diagnostic system and the runoff series from 1966 to 2018 at the Taoyuan hydrological station to find out the evolution characteristics of inner-annual and inter-annual runoff entering into Dongtin Lake from the Yuanjiang River under the joint operation of cascade reservoirs.The results showed that,under the double influences of the joint operation of cascade reservoirs and the increasing water usage in the basin,in terms of the inter-annual varia⁃tion characteristics,the average annual flow of the Yuanjiang River experienced moderate variation and weak varia⁃tion as a whole from January to May,and the average annual flow of the Yuanjiang River followed a decreasing trend;in terms of inner-annual variation characteristics,the annual distribution trend of the Yuanjiang River run⁃off was less significant.This paper can help improve fine operation management of cascade reservoirs in the Yuanji⁃ang River Basin and provide references for analyzing water into Dongting Lake.

关 键 词：径流演变 梯级水库 水库调度 水文变异诊断系统 沅江 洞庭湖 

分 类 号：TV121[水利工程—水文学及水资源]