基于二维平面水流数学模型的平原河道上跨改建桥梁流场影响分析  

Analysis of the Effect of Reconstructing River-Crossing Bridgeson the Flow Field in Plain Rivers Based on the Palar Two-Dimensional Mathematical Model of Water Flow

作　　者：程正果 CHENG Zhengguo(Anhui Modern Transportation Design and Research Institute,Hefei,Anhui Province,230000 China)

机构地区：[1]安徽省现代交通设计研究院,安徽合肥230000

出　　处：《大众科学》2024年第6期41-43,共3页China Public Science

摘　　要：模型基于全方位不可压缩与雷诺数均匀分布的纳维斯托克斯方程,并服从于非线性布西尼斯克方程假定和静水压强的假定,通过对皖北平原河流上跨桥梁的河道二维水流数学模型研究,分析了平原河流在上跨桥梁改建后的流场变化,对比流速、流向变化,分析认为工程实施后,河道流速较小,减轻了洪水期现状河道的岸坡及主河槽的冲刷,受桥墩阻水作用影响,桥墩局部流场发生细微变化,但对河道流场的影响程度和影响范围较小,在较短河段内便可消除,工程对整个河道的流场影响较小。The model is based on the Navier Stokes equation with omnidirectional incompressibility and uniformly-distributed Reynolds number,and is subject to the assumptions of the Boussinesq equation and hydrostatic pressure.This paper studies the two-dimensional mathematical model of water flow of rivers with rivercrossing bridges in plain rivers in Northern Anhui,analyzes flow field changes in plain rivers after the reconstruction of river-crossing bridges,and compares the changes in flow velocity and directions.The analysis shows that after the implementation of the project,the flow velocity of the river is relatively small,which reduces the erosion of the bank slope and main channel of the current river during the flood period,and that due to the water-blocking effect of bridge piers,the local flow field of the bridge piers changes slightly,which has the relatively small degree and scope of influence on the flow field of the river and can be eliminated in a shorter river section,and the project has a relatively small impact on the flow field of the entire river.

关 键 词：NAVIER-STOKES 方程 桥梁改建 平原河流 二维平面水流数学模型 

分 类 号：U442.35[建筑科学—桥梁与隧道工程]