水利水电技术（中英文）2025，Vol.56Issue(2)：59-70,12.DOI:10.13928/j.cnki.wrahe.2025.02.005
桥梁堵塞对河道洪水影响的三维数值模拟
Effect of bridge blockage on flood flow by three dimensional numerical simulation
摘要
Abstract
[Objective]Flash floods often contain floating debris such as driftwood and branches,which can cause bridge blockages,affecting the river's flood-carrying capacity and increasing the risk of flash flood disasters.Existing standards for evaluating the risk of flash flood disasters don't consider the impact of bridge blockages,underestimating the risk level.[Methods]takes A river channel in Huachi County,Gansu Province was took as an example,and a three-dimensional hydrodynamic numerical model was used to carry out research on the flood inundation risk under different bridge blockage rates.It analyzed the impact of different design rainstorm conditions such as 100-year,50-year,20-year,and 10-year return periods,as well as the bridge blockage rate on the flood risk.[Results]The research indicates that under no blockage conditions,the river's flood prevention capacity is greater than a 50-year return period flood.However,as the blockage rate increases,the floodwater level in the river rises.Notably,when the blockage rate reaches 80％,the bridge's flow capacity coefficient under a 50-year return period flood decreases by 60％,and under a 10-year return period flood,it decreases by 22％.An empirical relationship between the bridge's flow capacity correction coefficient and the blockage rate has been established.[Conclusion]Bridge blockages significantly reduce the river's flood-carrying capacity and increase the risk of flooding.In the assessment of flash flood disaster risk,it is necessary to consider the potential impact of bridge blockages.The empirical formula for the flow capacity correction coefficient proposed in this study can provide a reference for setting the boundary conditions within the bridge section under blockage conditions in a one-dimensional model.关键词
桥梁堵塞/洪水风险/过流能力/壅水高度/数值模拟Key words
bridge blockage/flood risk/the flow capacity/backwater height/numerical simulation分类
水利科学引用本文复制引用
荆海晓,牛磊,侯精明..桥梁堵塞对河道洪水影响的三维数值模拟[J].水利水电技术（中英文）,2025,56(2):59-70,12.基金项目
国家自然科学基金项目(52079106) （52079106）
西安市科技计划项目(23GXFW0050) （23GXFW0050）
