输水明渠桥梁群壅水影响数值模拟分析  

Numerical simulation analysis of influence of bridge group on backwater in open channel

作　　者：闫杰超 YAN Jiechao(POWERCHINA Jiangsu Engineering Corporation Limited,Nanjing 211100,China)

机构地区：[1]中电建江苏勘测设计研究院有限公司,江苏南京211100

出　　处：《水利水电快报》2023年第12期76-81,87,共7页Express Water Resources & Hydropower Information

基　　金：国家自然科学基金项目(51779149)。

摘　　要：为研究城市输水明渠桥群产生的壅水影响问题,以成都市重要输水明渠东风渠为例,建立了东风渠涉水桥梁群的平面二维水动力数学模型,分析了桥梁座数、桥梁间距、明渠流量对桥梁群壅水的影响,以及明渠壅水与桥梁座数、距离的函数关系。结果表明:桥梁壅水与桥梁个数、距离及流量密切相关,即随着明渠上游桥梁个数的增加,上游壅水高度相应增加;随着桥梁间距离增大,明渠上游壅水高度相应减小;随着设计流量增大,上游壅水高度相应增大。明渠平均壅水高度与桥梁座数、桥梁距离均呈对数函数分布,且当流量增加时,壅水效应明显。In order to solve the problem of the backwater effect caused by urban open channel bridge group,taking Dongfeng Channel as an example,a two-dimensional hydrodynamic mathematical model of Dongfeng Channel bridge group was established,and the effects of the number of bridges,distance and discharge on the backwater effect of bridge group were analyzed.The results showed that the effect of bridge backwater was closely related to the number,distance and discharge of bridges,With the increase of the number of bridges upstream,the upstream backwater height increased correspondingly.With the increase of the distance between bridges,the height of backwater in the upper reaches of open channel decreased accordingly.The height of backwater increased with the increase of design flow.Based on the analysis of the relationship between the number of bridges,the distance of bridges and the change of flow on the effect of bridge group backwater,it was concluded that the average backwater height increased with the increase of bridge number,but decreased with the increase of bridge distance.At the same time,the backwater effect increased obviously when the discharge increases.

关 键 词：输水明渠 桥群 壅水 水动力数学模型 东风渠 

分 类 号：TV68[水利工程—水利水电工程]