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引用本文:李彦彦,李冰,杨桂山,万荣荣.1960年以来洞庭湖江湖连通河道松滋口枯水期分流变化特征及应对策略.湖泊科学,2021,33(6):1885-1897. DOI:10.18307/2021.0622
Li Yanyan,Li Bing,Yang Guishan,Wan Rongrong.Characteristics of flow change in dry season and countermeasures of Songzikou River, a river-lake connected channel of Lake Dongting since 1960. J. Lake Sci.2021,33(6):1885-1897. DOI:10.18307/2021.0622
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1960年以来洞庭湖江湖连通河道松滋口枯水期分流变化特征及应对策略
李彦彦1,2, 李冰2,3, 杨桂山2,3, 万荣荣2,3
1.江苏第二师范学院城市与资源环境学院, 南京 210013;2.中国科学院南京地理与湖泊研究所, 中国科学院流域地理学重点实验室, 南京 210008;3.中国科学院大学, 北京 100049
摘要:
河湖水文连通性强弱对于维系流域水资源安全、河湖生态系统稳定等方面具有重要意义.本文首先利用1960-2019年松滋口新江口与沙道观两站与干流枝城站实测水文资料以及河道典型横断面地形资料,采用Mann-Kendall法与趋势线法分析讨论枯水期松滋口分流变化的特征与诱因,然后,针对枯水期松滋口河道的分流问题提出河道治理方案.结果表明:松滋口枯水期的流量主要来自西支.在1960-2019年间,枯水期西支分流量呈现三峡大坝蓄水运行前后从下降趋势转变为显著上升趋势,而东支分流量在下荆江裁弯后至今基本处于断流状态,下荆江裁弯、葛洲坝运行及三峡大坝蓄水运行是其分流量变化的主要诱因.根据建立分流量与水位差(干流水位与河底高程)的回归关系,模拟出在松滋口西东支现有河道的基础上,河床高程分别下降1 m与2.5 m左右,其分流量可达到或接近1960s分流量水平,有助于缓解区域水资源与环境生态问题.
关键词:  长江  荆江三口  水文连通性  江湖关系  三峡水库  松滋口  洞庭湖
DOI:10.18307/2021.0622
分类号:
基金项目:国家自然科学基金项目(41601041,41801092,41901114)、中国科学院重点部署项目(KFZD-SW-318)和江苏第二师范学院引进高层次人才科研启动经费项目(920001)联合资助.
Characteristics of flow change in dry season and countermeasures of Songzikou River, a river-lake connected channel of Lake Dongting since 1960
Li Yanyan1,2, Li Bing2,3, Yang Guishan2,3, Wan Rongrong2,3
1.School of Urban, Resource and Environmental Sciences, Jiangsu Second Normal University, Nanjing 210013, P. R. China;2.Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China;3.University of Chinese Academy of Sciences, Beijing 100049, P. R. China
Abstract:
Hydrological connectivity of rivers and lakes is of great significance for maintaining water resources security and ecosystem stability. In this paper, based on the measured hydrological data of Xinjiangkou and Shadaoguan stations in Songzikou, Zhicheng station in the Yangtze River and the topographic data of the typical cross sections from 1960 to 2019, characteristics and causes of the water diversion change of Songzikou in the dry season were analyzed and discussed by the Mann-Kendall and the trend line methods. Then, the paper put forward the river management plan for the problem of the diversion of Songzikou River in the dry season. The results show that water discharge of Songzikou in the dry season mainly came from the west branch. During 1960-2019, runoff of the west branch changed from a downward trend to a significant upward trend before and after the impoundment operation of the Three Gorges Dam in the dry season, while the east branch was in a state of draught-up after the cutoff of the Lower Jingjiang River. The main causes of runoff variation are the cutoff of the Lower Jingjiang River, and the impoundment operation of the Gezhouba Dam and the Three Gorges Dam. The simulation results show that if the river bed elevation decrease about 1 m and 2.5 m respectively in the west-east branch of Songzikou, and the water diversion could reach or approach the water discharge level in the 1960s, which is helpful to alleviate the regional water resources, environmental and ecological problems.
Key words:  Yangtze River  Jingjiang Three Outlets  hydrological connectivity  river-lake relationship  Three Gorges Reservoir  Songzikou  Lake Dongting
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