长江上游东溪口水道新水沙条件下航槽维护措施  

Maintenance measures for navigation channel in new water and sediment conditions of Dongxikou waterway in the Yangtze River upstream

作　　者：吕韵鹏 胡江[1,2] 秦镭宁 廖江花[2] LYU Yun-peng;HU Jiang;QIN Lei-ning;LIAO Jiang-hua(Key Laboratory of Hydraulic and Waterway Engineering of Ministry of Education,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：《水运工程》2021年第8期80-86,92,共8页Port & Waterway Engineering

基　　金：国家重点研发计划项目(2018YFB1600400);重庆市社会民生科技创新专项(cstc2016shmszx30012)。

摘　　要：长江上游干支流大型枢纽群的运行导致水沙条件发生较大变化,加之2017年以前的人为采砂活动,使得长江上游东溪口滩群河段航道发生较大程度的演变。左、右两汊分流、分沙比改变,使得形态较为顺直的左槽初步满足枯水期通航的可能。采用斗笠子—东溪口水道物理模型研究新条件下左槽的航道维护措施,通过枯水期至洪水期的8组流量作为控制条件,测量分析方案前后左右槽分流比、沿程水位、流速、流向及流态的变化,模拟船舶上下滩过程。结果表明,推荐维护方案实施后,对上游斗笠子急滩影响不大;各时期航槽内流向平顺,流速稳定在3 m/s以内,船舶通航条件良好,左槽通航水位可由现在的设计水位以上5 m降低至2 m。The operation of large hub groups in the main and tributaries of the upper reaches of the Yangtze River led to the great changes in water and sand conditions. In addition, man-made sand mining activities before 2017 led to the large-scale evolution of the channel in the Dongxikou group of shoals in the Yangtze River upstream.The changes of splitting ratio and sand ratio in left and right branches, which can make the left channel with relatively straight shape meet the possibility of navigation during the dry season. We adopt the physical model of Dulizi-Dongxikou waterway to study the channel maintenance measures of the left channel under the new conditions, take 8 groups of flow rates from the dry period to the flood period as the control conditions, measure and analyze the changes of the diversion ratio, water level, velocity, direction and flow pattern of the left and right channel before and after the scheme and simulate the process of the ship going up and down the shoal. The results show that the recommended maintenance scheme has little effect on the upstream Doulizi rapid. In each period, the flow direction in the channel is smooth, the flow velocity is stable within 3 m/s, the navigation condition of the ship is good, the navigable water level of the left channel can be reduced from 5 m above the current design water level to 2 m.

关 键 词：水沙条件 航道整治 物理模型 东溪口水道 

分 类 号：U612[交通运输工程—船舶及航道工程]