二维数学模型在某亲水广场防洪评估中的应用

Application of Two-Dimensional Mathematical Model in Flood Prevention Evaluation of a Hydrophilic Square

针对沿河修建亲水广场侵占河道行洪断面,存在阻碍行洪安全及破坏河道现有稳定形态的问题,以某亲水广场在百年一遇工况下对河道的影响为例,采用非结构化三角形网格技术,建立河道二维数学模型。模型中将支柱附近的网格单独加密处理,利用局部拔高地形概化支柱,保持广场建设前后网格数量与大小的一致性,分析广场建设前后对百年一遇洪水的影响。结果表明:亲水广场在百年一遇设计洪水下,岸坡进行合理开挖未产生壅水;支柱阻碍水流流动,流向存在轻微偏转;左岸流速增大,右岸流速减小;水动力轴线在工程位置存在两米偏移。因此,亲水广场建设对河道行洪不构成威胁,为河道工程建设提供理论支持。

Aiming at the construction of the hydrophilic square along the river to occupy the flood cross section of the river,there are problems that hinder flood safety and destroy the existing stability of the river.Taking the influence of a hydrophilic square on the river under the condition of once in a century as an example,a two-dimensional mathematical model of the river is established using unstructured triangular mesh technology.In the model,the grids around the pillars are separately encrypted,and the terrain is used to generalize the pillars to maintain the consistency of the number and size of the grids before and after the square construction.The effect of the square before and after the construction on the flood in one hundred years is analyzed.The results show that:under the design flood of one hundred years,rational excavation of the bank slope did not generate backwater;the pillars impeded the flow of water,and there was a slight deflection of the flow direction;the flow velocity on the left bank increased and the flow velocity on the right bank decreased;The position is offset by two meters.Therefore,the construction of the hydrophilic square does not pose a threat to river flooding,and provides theoretical support for river engineering construction.