三峡水库蓄水后下荆江险工段近岸河床演变分析  

Nearshore riverbed evolution of key dangerous reach of lower Jingjiang River after impoundment of Three Gorges Reservoir

作　　者：石建华 李宁波 袁虎 龙慧 

机构地区：[1]长江水利委员会荆江水文水资源勘测局,湖北荆州434020

出　　处：《人民长江》2013年第1期18-21,33,共5页Yangtze River

基　　金：国家重点基础研究发展计划"973"项目"长江中游通江湖泊江湖关系演变及环境生态效应与调控"(2012CB417001)

摘　　要：自三峡水库蓄水运用以来,下荆江大部分已加固的原险工河段相对稳定。对下荆江水沙变化特性和重点河段河床演变情况的分析表明,局部河势仍在调整之中,主要表现为主流摆动频繁、水流顶冲点下移。以下荆江向家洲、北门口、北碾子湾和七弓岭等为例,分析了三峡水库蓄水后水下坡比、冲刷坑的变化,以及近岸河床的年际、年内冲刷特点。结果表明,在护岸工程较为薄弱或未实施的局部河段,水下坡比变陡,存在潜在崩岸险情,应加强护岸工程的巡查和加固工作。Since the impoundment of Three Gores Reservoir, most of the dangerous river reaches reinforced in lower Jingjiang River are stable. The characteristics of flow and sediment variation and riverbed evolution of key river sections are analyzed. It shows that the river regime in some regions is still in adjustment with the features of frequent swings of the main stream and downward movement of scouring point. Taking the Xiangjiazhou, Beimenkou, Beinianziwan and Qigongling for case study, the variation of underwater bank slope and scouring pit are studied, so are the annual and inter - annual scouring of uearshore riverbed. The results show that in the regional sections where the bank is weak or unreinforced, the underwater bank slope steepens, so the risk of bank collapse exists and the touring inspection and reinforcement of bank protection project should be strengthened.

关 键 词：下荆江 护岸工程 河床演变 三峡水库中图法 

分 类 号：TV85[水利工程—水利水电工程]