文献类型：期刊文献

中文题名：基于自适应网格加密的桥梁防洪风险数值模拟研究

英文题名：Numerical Simulation on Flood Risk Analyzes of Bridge Based on Adaptive Mesh Refinement Scheme

作者：林金波[1];赫岩莉[1];毛鸿飞[1];孙一方[1];吴光林[1]

机构：[1]广东海洋大学海洋工程学院,广东湛江524088

年份：2022

卷号：20

期号：4

起止页码：189

中文期刊名：水利与建筑工程学报

外文期刊名：Journal of Water Resources and Architectural Engineering

基金：湛江市海洋青年人才创新项目(2021E05009;2021E05007);湛江市非资助科技攻关计划项目(2021B01160;2021B01416);广东海洋大学科研启动费资助项目(060302072103;060302072102;R20068)。

语种：中文

中文关键词：桥梁;防洪风险评价;数值模拟;Delaunay网络剖分方法

外文关键词：bridge;flood risk analyze;numerical simulation;Delaunay mesh generation method;

中文摘要：为了确保桥梁安全,消除洪水灾害的威胁,在桥梁建设前对拟建桥梁进行细致的防洪风险分析就显得尤为重要。利用有限体积方法,结合Delaunay网格剖分方法,进行自适应网格加密,建立高效的桥梁工程防洪风险评价模型。通过桥墩周围网格局部加密的方式,维持大范围河道大尺度计算网格,从而降低网格数量,提高计算效率。模型验证通过溃坝算例说明使网格数量大幅降低的同时维持了较高的计算精度。利用数值模型对某桥梁工程进行防洪风险评价,结果表明:桥梁工程的建设使桥墩附近流速降低,桥墩间流速增大约0.5m/s左右,桥梁上下游断面流速降低约0.2m/s;桥梁上下游河道断面水位稍有抬升,设计洪水标准条件下桥梁上下游河道断面最高水位为540.70m,低于桥梁底部最低高程540.94m,拟建桥梁工程能够满足河道防洪要求。

外文摘要：To ensure bridge safety and eliminate the threat of flood disaster,it is particularly important to conduct a detailed flood control risk analysis on the proposed bridge before the bridge construction.An efficient flood risk analyze model of bridge is established by using finite volume method combined with Delaunay mesh generation method which can adaptively refine the mesh.By locally refining the mesh around the pier,the large mesh size of large-scale river channel is maintained.Consequently,the mesh number is reduced and the calculation efficiency is improved.Comparing the results of water level and velocity calculated by different mesh models with the analytical solution,a greatly reduce of the mesh number is achieved meanwhile a high calculation accuracy is maintained by the local mesh refinement method.The numerical model is then used to analyze the flood risk of a bridge project.The results show that the construction of the bridge reduces the velocity near the pier and increases the velocity between the piers by about 0.5 m/s.The upstream and downstream section velocity of the bridge are reduced by about 0.2 m/s.The upstream and downstream water level of the bridge are increased slightly.The maximum water level around the bridge is 540.70 m,which is lower than the minimum bottom elevation 540.94 m of the bridge,under the design flood standard.The bridge can meet the flood control requirements of the river.