不同桥墩概化方法在防洪评价中的应用研究

Study on the Application of Different Bridge Pier Generalization Methods in Flood Control Evaluation

基于非结构网格和二维水流数学模型,采用4种常用的桥墩概化方法,模拟计算了桥梁建设前后的壅水和流速、流向变化,得出不同概化方法在防洪评价中的适用性,为桥梁工程的建设以及防洪评价报告的审批提供一定的技术参考。计算结果表明,将桥墩作为陆地边界概化的直接模拟法(1)能最好地反映实际水工结构和地形的变化,计算结果可作为防洪评价的重要依据。

Based on unstructured grid and two-dimensional flow numerical model,four kinds of pier generalization methods are used to simulate and calculate the back-water,velocity and flow direction changes before and after bridge pier.The applicability,advantages and disadvantages of different generalization methods in flood control evaluation are obtained,which provides technical reference for the construction of bridge engineering and the approval of flood control evaluation report.The calculation results show that the direct simulation method(1) deduction method with pier as land boundary generalization can best reflect the changes of actual hydraulic structure and topography,and the calculation results can be used as an important basis for flood control evaluation.