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基于边界拟合良好的曲线网格上建立的平面二维水流运动数学模型,以长江中下游不同河段为例,针对不同特性河段,系统地分析了桥梁建筑物对于河道洪水位、流速等要素的影响程度及其变化规律.研究结果表明,河道流量越大、洪水位越高、不同桥型桥墩阻水率越大,建桥后河道壅水值、壅水范围以及流速变化值、变化范围也越大;相同流量及相同桥墩阻水率情况下,河道水面纵比降越大,建桥后桥墩附近壅水及流速变化最大值越大,但壅水及流速变化影响范围却相对较小.研究成果可为工程初步选址以及设计提供技术参考.
Based on the mathematical model of planar two-dimensional flow movement established on the curve grid with good boundary fitting, taking the different reaches of the Yangtze River as an example, this paper systematically analyzes the influence of bridge structure on the flood level, The results show that the greater the river flow rate is, the higher the flood level is, the greater the water blocking rate of bridge piers is, and the changes of water swales’ value, swill water area and velocity after the bridge are built The bigger the range is. Under the same flow rate and water blocking rate of the same piers, the vertical drop of river water surface is bigger, the maximum value of water change and flow velocity near bridge pier after bridge construction is bigger, but the influence scope of change of water flow and flow velocity is relatively The research results can provide a technical reference for the preliminary site selection and design of the project.