摘要
为保障赣江尾闾主支枢纽二期围堰预进占施工期间的通航安全,采用二维水流数值模拟方法,对不同施工场景和工况下临时航道的水动力过程进行了模拟分析,提出了临界通航水流条件和改善措施。结果表明:保留一期上游围堰可以起到导流的作用,能够改善局部通航水流条件;预进占工程会改变河道局部水流流向,对局部航道横向流速有影响,但总体上对航道通航水流条件影响不大;保留一期下游围堰会增大左侧临时航道分流比,显著扩大临时航道纵向流速超过2 m/s的范围,对通航不利;在现状、现状围堰拆除和二期围堰预进占施工情况下,调整后的临时航道横向流速超过0.5 m/s的断面数量分别比调整前减少66.7%、70%和66.7%,通航条件得到明显改善。
To ensure navigation safety during the pre-advance construction period of the second-stage cofferdam at the main branch project in the lower reaches of the Ganjiang River,a two-dimensional hydrodynamic numerical simulation method was employed to model and analyze the hydrodynamic processes of the temporary navigation channel under various construction scenarios and working conditions.Threshold navigation flow conditions and corresponding improvement measures were proposed.The results demonstrate that retaining the upstream section of the first-stage cofferdam serves a flow-diversion function,thereby improving local navigation flow conditions.Although the pre-advance construction alters the local flow direction in the river channel and affects lateral flow velocities in certain sections of the temporary channel,its overall impact on navigation flow conditions remains limited.However,retaining the downstream cofferdam of the first stage increases the diversion ratio of the left temporary channel,significantly expanding the range where longitudinal flow velocities exceed 2 m/s,which adversely affects navigation.After implementing adjustments,the numbers of cross-sections in the temporary channel with lateral flow velocities exceeding 0.5 m/s under current conditions,after removal of the existing cofferdam,and during the pre-advance construction of the second-stage cofferdam decreased by 66.7%,70%,and 66.7%,respectively,compared to pre-adjustment conditions,indicating a notable improvement in navigation conditions.
作者
邱勇
张涛涛
刘子涵
肖洋
吴宇泽
吴承景
徐林万
QIU Yong;ZHANG Taotao;LIU Zihan;XIAO Yang;WU Yuze;WU Chengjing;XU Linwan(Jiangxi Ganfu Weilv Renovation Co.,Ltd.,Nanchang 330025,China;School of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou 215009,China;College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;Yangtze Institute for Conservation and Development,Hohai University,Nanjing 210098,China;State Key Laboratory of Water Disaster Prevention,Hohai University,Nanjing 210098,China)
出处
《水利水电科技进展》
北大核心
2025年第6期126-133,共8页
Advances in Science and Technology of Water Resources
基金
国家自然科学基金长江联合基金项目(U2240209)
国家自然科学基金项目(52309102,52379075)
水利部重大科技项目(SKS-2022124)。
关键词
枢纽工程
通航水流条件
数值模拟
赣江
key project
navigation flow condition
numerical simulation
the Ganjiang River
