摘要
以某跨河桥梁为例,分别采用水面线法和流量分配公式对其防洪评价中桥梁壅水计算和冲刷计算进行了分析探讨,结果表明,通过水面线法推求不同断面壅水高度时,桥位断面和上游断面间距是影响计算结果的主要因素;而采用流量分配公式计算桥位冲刷深度时,计算结果主要受到河槽河滩流量分配的影响。文章分析基本上解答了困扰跨河桥梁防洪评价报告编写过程中,设计人员在计算方法选择及过程设计等方面的难题,为跨河桥梁壅水计算和冲刷计算结果的准确合理提供了保证。
Taking a river crossing bridge as an example, the backwater calculation and scour calculation of the bridge in flood control evaluation are analyzed and discussed respectively by using the water surface profile method and the flow distribution formula. The results show that when the backwater height of different sections is calculated by using the water surface profile method, the distance between the bridge site section and the upstream section is the main factor affecting the calculation results. However, when the scour depth of bridge site is calculated by the discharge distribution formula, the calculation results are mainly affected by the discharge distribution of river channel and shoal. The analysis of the article basically solves the problems that perplex the designers in the selection of calculation methods and process design during the preparation of flood control evaluation report for river crossing bridges,and guarantees the accuracy and rationality of backwater calculation and scouring calculation results for river crossing bridges.
作者
文星
WEN Xing(Bayingolin Mongol Autonomous Prefecture Water Resources and Hydropower Survey and Design CO.LTD.,Korla 841000,China)
出处
《河南水利与南水北调》
2022年第12期50-51,68,共3页
Henan Water Resources & South-to-North Water Diversion
关键词
跨河桥梁
防洪评价
壅水计算
冲刷计算
river crossing bridge
flood control evaluation
backwater calculation
scour calculation
