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为分析桥梁雍水对行洪的影响,以汉北河竟陵大桥为例,利用TUFLOW软件计算了贴体网格、阻水面积和局部区域加糙等不同的桥墩概化方法下的雍水高度,并将计算结果与MIKE21和《公路工程水文勘测设计规范》公式的结果进行对比可知,计算工况下桥墩不会对河道行洪产生显著的影响。结果表明,贴体网格不能合理反映桥墩的阻水效应,会高估桥墩的阻水效应;合理设置阻水面积以及人工加糙系数能够取得与现行规范相一致的结果。
In order to analyze the impact of bridge Yong water on flood discharge, taking Han River Jingling Bridge as an example, the calculation of the body grid with TUFLOW software, the water blocking area and local roughing of different bridge pier generalization methods, , And comparing the calculation results with the results of MIKE21 and the formula of “Hydrological Survey and Design Code for Highway Engineering”, we can see that under the condition of calculation, the piers will not have a significant impact on flood discharge. The results show that the body-fitted grid can not reasonably reflect the water blocking effect of the piers and overestimate the water blocking effect of the piers. Reasonable setting of the water blocking area and the artificial roughness coefficient can achieve the results consistent with the current codes.