摘要
涉水桥梁的高密度建设可能对河道产生一些不利影响。为探究桥群对河道水动力的累积影响,通过建立平面二维水动力学模型分析平原河道中桥群建设前后河道壅水高度、流速等水动力特性的变化,得到河道水动力对桥梁数量、桥梁距离的响应关系。结果表明:桥群会对上游河道形成桥前壅水和墩前冲高,墩前冲高远大于桥前壅水,冲高影响在距桥群上游8倍墩宽的距离时几乎消失;河道水动力累积影响随桥群数量的增加而显著增加;当桥梁之间距离超过160倍墩宽时,累积影响几乎消失。因此,在桥梁建设中需合理设置桥梁数量、桥梁间距以减小桥群的累积影响。
The proliferation of river-crossing bridges at high densities may have adverse effects on rivers.To investigate the cumulative impact of bridge clusters on the hydrodynamic characteristics of river channels,a twodimensional hydrodynamic model is employed to analyze how the construction of bridge clusters influences various hydrodynamic characteristics,such as water height and velocity.The study aims to establish a relationship between the number of bridges,bridge spacing,and hydrodynamic characteristics of river channels.The findings reveal that bridge clusters create a backwater effect upstream of the bridges and induce a surge in water height near the piers.The surge height near the piers is significantly higher than the backwater effect near the bridges.However,the impact of the surge height diminishes when the distance between bridges is eight times the width of the piers.Furthermore,the cumulative impact on the river channel increases substantially with an increase in the number of bridge clusters.Once the distance between bridges exceeds 160 times the pier width,the cumulative impact on the river channel nearly disappears.Therefore,it is crucial to consider the number of bridges and bridge spacing in bridge construction to minimize the cumulative impact of bridge clusters.
作者
李阳帆
吕馨怡
徐华
王晓俊
杜德军
LI Yangfan;LÜXinyi;XU Hua;WANG Xiaojun;DU Dejun(The National Key Laboratory of Water Disaster Prevention,Nanjing Hydraulic Research Institute,Nanjing 210029,China;Jiangsu Provincial Hydraulic Engineering Planning Office,Nanjing 210029,China)
出处
《水利水运工程学报》
CSCD
北大核心
2024年第3期34-41,共8页
Hydro-Science and Engineering
基金
国家重点研发计划资助项目(2022YFC3204504)
江苏省水利科技项目(2021004)。
关键词
桥群
水动力
桥梁间距
累积影响
bridge clusters
hydrodynamics
bridge spacing
cumulative impact
