不同桥墩概化方法对河道壅水模拟影响分析

Influence analysis of different pier generalization methods on simulation of backwater in river channel

在利用MIKE11对桥梁壅水进行计算时,不同的桥墩概化方法会对计算结果产生不同影响。基于MIKE11比较分析了内置构筑物法、等效过水面积法、更改地形法3种不同的桥墩概化方法对河道壅水高度、长度计算结果的影响。结果表明:等效过水面积法、更改地形法操作简便、参数较少、模型稳定、计算结果可靠、适用性强;内置构筑物法计算得到的壅水高度和长度较大,且模型稳定性较差、易发散。研究成果可为桥梁设计和河道管理提供参考。

When utilizing MIKE11 for the simulation of backwater in river channel caused by bridge,different pier generalization methods significantly influences the results.We analyzed the influence of three pier generalization methods of the built-in structure method,the equivalent overflow area method,and the terrain alteration method on the height and length of backwater in the river.The findings indicated that the equivalent overflow area method and the terrain alteration method were easy to operate,involved fewer parameters,ensured model result stability,and had a good applicability.In contrast,the built-in structure method tended to overestimate the backwater height and length and exhibits inferior model stability,with a propensity for divergence.The research results can provide a reference for bridge design and river management.