城市行洪河道桥群阻水叠加效应量化研究  

Study on Quantitative Water-Blocking Superposition Effect of Bridge Group on Urban Flood Channel

作　　者：吴时强[1] 薛万云[1] 吴修锋[1] 周杰[1] 戴江玉[1] 庞翠超[1] WU Shiqiang;XUE Wanyun;WU Xiufeng;ZHOU Jie;DAI Jiangyu;PANG Cuichao(State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Nanjing Hydraulic Research Institute,Nanjing 210029,China)

机构地区：[1]南京水利科学研究院水文水资源与水利工程科学国家重点实验室

出　　处：《人民黄河》2019年第10期96-102,共7页Yellow River

基　　金：国家自然科学基金资助项目(51409165,51609143);江苏省水利科技项目(2016019)

摘　　要：针对城市行洪河道桥梁群形成的叠加阻水效应问题,以南京市重要行洪通道秦淮河为例,考虑桥墩不过水边界等因素,建立了秦淮河涉水桥梁群的平面二维水流数学模型,对桥群阻水叠加效应进行量化分析。分析结果表明,河道上游水流受桥梁群阻水影响,水位壅高较为明显,壅水高度随桥墩数量的增加而增大。基于计算结果,推导出了桥梁群壅水高度计算公式,并通过滁河六合城区段桥群壅水叠加影响进行了验证,验证结果良好。同时,给出了桥墩在河道两侧及河道中心的位置影响系数值,阐明了桥群壅水叠加机理;所建立的壅水叠加公式较好地反映了河道桥群的阻水叠加效应,为城市河道桥群壅水叠加影响的量化分析研究提供了科学依据。Aiming at the problem of superimposed water blocking effect formed by bridge groups on urban flood channel,taking the Qinhuai River,an important flood channel in Nanjing as an example,considering the bridge pier boundary,a two-dimensional mathematical model of the Qinhuai River was established and the water-blocking superposition effect of the bridge group was quantitatively analyzed.The results show that the upstream flow of the river channel is affected by the water blocking of the bridge group,the water level is higher,and the height of the water level increases with the increase of the number of piers.The superposition mechanism of the bridge group is clarified,and the formula for calculating the height of the bridge group is derived.The location influence coefficient of the bridge on both sides of the river channel and the center of the river channel is given.The results are verified by the bridge group of Chuhe River and the verification results are good.The established formula can reflect the water-blocking superposition effect of the bridge group well and it provides a scientific and reasonable basis for the quantitative analysis of the influence of the superimposed water from bridge group.

关 键 词：行洪河道 阻水 叠加效应 数值模拟 量化 

分 类 号：TV62[水利工程—水利水电工程]