渉河大桥平面二维水流数值模拟  

The numerical simulation of two dimensional flow of She River Bridge

作　　者：姬战生[1] 孟健[1] 

机构地区：[1]杭州市水文水资源监测总站,浙江杭州310016

出　　处：《吉林水利》2012年第11期33-36,共4页Jilin Water Resources

基　　金：国家自然科学基金资助项目(51109054)

摘　　要：以某铁路涉河大桥为例,根据实测河道水下地形资料进行网格概化,以河网一维数学模型计算成果作为控制边界条件,利用MIKE21建立了平面二维水流数学模型,对渉河大桥对桥址河段流场变化进行分析。结果表明,遭遇50年一遇洪水时,桥墩附近的水流流向发生了改变,流速明显增大,会对河道堤防和河床产生冲刷。该方法可在渉河大桥二维水流数值模拟分析中推广应用。Taking a railway river bridge as an example,this article has carried out mesh generalization based on the measured terrain underwater of the River,under of the boundary control condition of river network one-dimensional mathematical model,with the MIKE21 established plane flow mathematical model,and analyzed the flow field changing in the site of She River Bridge.The results show that the flow direction near the piers had changed,and the flow rate increased significantly,the river embankment protection and river bed had been eroded during the experienced 50-year flood.The method can be applied to the analysis of the numerical simulation of two-dimensional flow in She River Bridge.

关 键 词：涉河大桥 平面二维 数学模型 MIKE21 

分 类 号：O242[理学—计算数学] TV131[理学—数学]