平原河网地区桥渡壅水平面二维水流数值模拟  

Numerical simulation on planar 2D of bridge piers choked flow in plain rivers network regions

作　　者：姬战生[1] 张飞珍[2] 孙映宏[1] 

机构地区：[1]杭州市水文水资源监测总站,杭州310016 [2]杭州市南排工程建设管理处,杭州310020

出　　处：《黑龙江大学工程学报》2013年第1期17-21,共5页Journal of Engineering of Heilongjiang University

基　　金：国家自然科学基金项目(51109054)

摘　　要：为分析平原河网地区桥渡对桥址河段壅水及流速场变化的影响,以杭州市德胜快速路石德立交R4匝道跨备塘河桥为例,根据实测河道水下地形资料进行网格概化,以上塘河流域MIKE11一维水动力模型计算成果作为控制边界条件,利用MIKE21建立了平面二维桥渡数学模型。结果表明,遭遇20年一遇洪水时,桥墩上游一定范围内出现水位雍高,3个桥墩所在断面最大壅水高度达0.04m,最大壅水长度160m;桥墩附近的水流流向发生了改变,流速有所增大,对河道堤防和河床产生明显冲刷。该方法可在平原河网地区桥梁防洪影响分析工作中推广应用。In order to study the influence of bridge piers on choked flow and the change of velocity field in plain rivers network region, the bridge piers of R4 ramp of Shide Interchange in Desheng Expressway of Hangzhou City was taken as an example, and MIKE21 planar 2D mathematical model for bridge pier choked flow movement was set up, according to the regularization gird represented the actual rivers bed and boundary condition based on the calculation results of 1D hydrodynamic model MIKE11 of the Shangtang River basin. The results revealed that for the 20-years return period flood, the upstream of bridge piers choked flow in fixed range, and the maximum backwater height is up to 0.04 meter and the maximum backwater length is 160 meter. It is the changed flow direction and the increased flow velocity near the piers that scoured the rivers embankment and bed. The method could be used popularly to other flood control evaluation of river-crossing bridge in plain river network regions.

关 键 词：平原河网地区 桥渡 壅水 平面二维数学模型 MIKE21 

分 类 号：TV143[水利工程—水力学及河流动力学]