基于MIKE21的丁坝和导流排对河道流速的影响研究  

The influence of spur dikes and diversion banks on river velocity based on MIKE21

作　　者：李晓冰 LI Xiaobing(Hebei Institute of Investigation&Design of Water Conservancy&Hydropower Group Limited,Tianjin 300220,China)

机构地区：[1]河北省水利水电勘测设计研究院集团有限公司,天津300220

出　　处：《水科学与工程技术》2025年第2期54-56,共3页Water Sciences and Engineering Technology

摘　　要：河道工程中常设置丁坝和导流排作为导流建筑物以改善堤防的水流冲刷作用,为研究丁坝和导流排对河道流速的影响,采用MIKE21二维模型模拟,将丁坝和导流排分别概化为堤防和堤防与闸门相结合的建筑物,分析流速变化,并对建筑物概化方案提出设想。通过模型模拟得到丁坝和导流排对河道流速有一定影响,但影响较小。其原因有两方面:一是河道较宽,河流流速较小;二是丁坝和导流排的布置间距小,长度不够。此次计算将透水导流排概化为堤防和闸门相结合的建筑物,笔者认为还可以将导流排概化为桥墩计算。根据工程实际设置不同计算工况,选取不同概化方案,为工程设计提供参考依据。In river engineering,spur dikes and diversion banks are often as diversion structures to improve the anti-flow erosion effect of embankments.In order to study the impact of spur dikes and diversion banks on river flow velocity,a MIKE21 two-dimensional model is used to simulate.The spur dikes and diversion banks are respectively generalized as embankments and buildings that combine embankments and gates.The changes of velocity are analyzed,and a conceptual scheme for the building is proposed.Through the model simulation,it is found that the spur dikes and the diversion banks have some influence on the velocity of the river,but the influence is not very great.There are two reasons for this result:First,the river is wide and the velocity itself is not large.Second,the spacing between the spur dikes and the diversion row is small and the length is not enough.In this calculation,the permeable diversion bank is generalized into a building combining dike and gate,and the author thinks that the diversion bank can also be generalized into bridge pier calculation.According to the engineering practice,different calculation conditions are set up and different generalization schemes are selected to provide reference for engineering design.

关 键 词：MIKE21 丁坝 导流排 流速 

分 类 号：TV863[水利工程—水利水电工程]