基于二维水动力模型与经验公式的桥梁壅水计算及其对比分析

发布时间：2019-01-15 22:37

【摘要】：本文以海南省南渡江六座桥梁为例,利用MIKE21数值模型计算不同频率洪水下各桥的桥前壅水值,并与经验公式计算结果进行对比分析。结果表明:MIKE21数值模型能够较好地模拟复杂地形,率定与验证过程中相对误差均小于5%,纳西效率系数均大于0.8;与二维模型计算结果相比,D’Aubuisson与Henderson经验公式计算结果偏小,在桥墩阻水面积比小于10%的情况下,Henderson公式计算结果比D’Aubuisson公式计算结果更接近二维模型计算值;而铁科院陆浩公式计算结果偏大。因此,对于处在复杂地形或是所在河道具有重要防洪任务的桥梁,建议采用数学模型计算壅水值,以便求得更加合理的计算结果,为防洪影响评价工作提供分析计算的依据。
[Abstract]:Taking six bridges of Nandujiang River in Hainan Province as an example, MIKE21 numerical model is used to calculate the backwater values in front of each bridge under different frequency floods, and the results are compared with the results of empirical formula. The results show that the MIKE21 numerical model can simulate the complex terrain well, the relative error in the process of rate determination and verification is less than 5, and the Naxi efficiency coefficient is more than 0.8. Compared with the results of two-dimensional model, the results of D'Aubuisson and Henderson's empirical formula are smaller. When the ratio of water resistance area of bridge piers is less than 10%, the result of Henderson formula is closer to the value of two-dimensional model calculation than that of D'Aubuisson formula. However, the calculation result of Lu Haogong formula in the Institute of Iron Sciences is on the high side. Therefore, it is suggested that the mathematical model be used to calculate the backwater value for bridges with complex topography or important flood control tasks in the river course, so as to obtain more reasonable calculation results and provide the basis for the analysis and calculation of flood control impact assessment.
【作者单位】：北京师范大学水科学研究院水沙科学教育部重点实验室;黄河勘测规划设计有限公司天津设计院;
【基金】：国家自然科学基金(51579007)
【分类号】：U442.33

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