新建梅汕铁路梅江特大桥防洪影响数值模拟研究

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关键词：梅江特大桥；防洪影响；数值模拟；涉水桥梁；壅水

中图分类号： TV212.5+3 文献标志码：A 文章编号：1003-5168（2025）21-0054-05

DOI：10.19968/j.cnki.hnkj.1003-5168.2025.21.010

Abstract： [Purposes] This study conducts a numerical simulation on the flood control impact of the newly built Meijiang Grand Bridge projectof the Meizhou-Shantou Railway.This aims to provide technical support for bridge flood control engineering construction [Methods] A two-dimensional flow mathematical model was used to calculate and analyze the changes in backwater，flow velocity，flow pattern， hydrodynamic axis，and beach-trough morphology in the river reach caused by the bridge construction. [Findings] The results indicate that the bridge project induces only minor backwater in the river channel，with a limited influence range on the nearby water levels，thus posing a minor impact on river flood control safety.The impact on flowvelocity isconfined to thevicinityof theproject，with minimal changes; the overallflow field remains smooth，flow velocity alters slightly within a small range，and the general flow regime remains unchanged.[Conclusions] This study provides areliable technical basis for the optimal design and construction of water-crossing bridges，assessment of river flood conveyance safety，and planning of measures to eliminate or mitigate impacts.

Keywords： Meijiang Grand Bridge; flood control impact; numerical simulation; water-crossing bridge; backwater

0 引言

利用二维水流数学模型，通过数值模拟来计算桥址河段工程建设前后壅水、流速、流态、水动力轴线及滩槽的变化，从而为桥梁防洪评价提供基础数据，为工程建设决策提供技术支撑，亦为水行政主管部门审批提供依据。（剩余3887字）