新水沙条件下荆南四河松西河航道治理思路  

Approach to channel management of Songxi River of four rivers in south of Jingjiang River under new water and sediment condition

作　　者：李强 郭敏 郭小虎[2] LI Qiang;GUO Ming;GUO Xiaohu(Hubei Communications Planning and Design Institute Co.,Ltd.,Wuhan 430051,China;Changjiang River Scientific Research Institute,Wuhan 430019,China)

机构地区：[1]湖北省交通规划设计院股份有限公司,湖北武汉430051 [2]长江科学院,湖北武汉430019

出　　处：《水运工程》2024年第10期137-143,共7页Port & Waterway Engineering

摘　　要：三峡建库后,长江中下游来水来沙条件改变,由长江入洞庭湖的荆南四河水文泥沙边界条件随之变化,三口分流量较建库前减少23%,分沙量减少88.8%,三口河道总体由冲淤平衡转为冲刷,其中松西河冲刷占比47%,中水位下松西河河道持续展宽,部分分汊、弯道及过渡河段冲刷较为剧烈,深泓摆动幅度较大,因滩槽不稳而碍航。针对长江-洞庭湖江湖关系变化带来的航道问题,在三峡建库后新的水沙条件及演化过程研究的基础上,对碍航特性、河床演变特性及趋势进行分析,提出松西河航道以疏浚和边滩守护为主,固滩稳槽、分段实施的治理思路,以典型的裴家场河段为例制定工程方案,并开展模型试验研究,对治理思路和方案效果进行验证。研究成果旨在为类似河湖连通长河段的航道治理提供借鉴。After the construction of the Three Gorges Reservoir,the water and sediment conditions in the middle and lower reaches of the Yangtze River have changed.The hydrological and sediment boundary conditions of the four rivers in the south of Jingjiang River from the Yangtze River to Dongting Lake have changed accordingly.The three outlets have decreased by 23%compared with before the construction of the reservoir,and the sediment distribution has decreased by 88.8%.The three channels have generally changed from erosion and deposition balance to erosion,of which the Songxi River erosion accounts for 47%.The Songxi River channel continues to widen under the medium water level.The erosion of some branches,bends and transitional reaches is more intense,and the thalweg swings greatly,which hinders navigation due to the instability of the beach and trough.Aiming at the channel problems caused by the change of the relationship between the Yangtze River and Dongting Lake,based on the study of the new water and sediment conditions and evolution process after the construction of the Three Gorges Reservoir,the characteristics and trends of navigation obstruction and riverbed evolution are analyzed.The Songxi River channel is mainly based on dredging and beach protection,and the beach stabilization and channel stabilization are carried out in sections.Taking the typical Peijiachang reach as an example,the engineering scheme is formulated,and the model test is carried out to verify the treatment idea and scheme effect.The research results aim to provide reference for the channel management of similar rivers and lakes.

关 键 词：松西河 水沙变化 航道条件 治理思路 

分 类 号：U61[交通运输工程—船舶及航道工程]