U型弯道内L型丁坝群对不同水位水流水力特性影响试验研究  

Experimental Study on the Influence of L-Shaped Groin Group in U-Shaped Bend on Hydraulic Characteristics of Flow at Different Levels

作　　者：杨亚杰 杨海鹏 景何仿 何斌 李昕 张茹凤 YANG Yajie;YANG Haipeng;JING Hefang;HE Bin;LI Xin;ZHANG Rufeng(School of Civil Engineering,Northern Minzu University,Yinchuan 750021,Ningxia,China)

机构地区：[1]北方民族大学土木工程学院,宁夏银川750021

出　　处：《水力发电》2024年第5期117-121,共5页Water Power

基　　金：国家自然科学基金资助项目(11861003);宁夏自然科学基金项目(2023AAC02049);北方民族大学科学计算与工程应用创新团队(2022PT_S02);北方民族大学本科生创新项目(202211407011);国家民委领军人才支持计划(11314000706).

摘　　要：弯道影响通航的同时,易造成水土流失、河床淤积等现象。L型丁坝群是一种常用的水利工程结构,能调整水流速度、改善水流动力学特性,用于保护河岸线、防止淤积。我国多数河流常年无固定水位,布置丁坝群后,不同水位下,丁坝群对水流特性的影响情况值得研究。为此,通过试验,使用粒子图像测速系统和无线水位测量系统,分别对水流流速和水位等物理量进行测量、记录,并通过Matlab软件分析了不同水位下丁坝群对水流的影响情况,得出如下结论:随着水位的增加,水流速度逐渐减小,丁坝群下游部分是防冲刷和淤积的最佳位置,且坝高水深比影响丁坝作用的发挥,当比值为2.5左右时,可使丁坝群的作用得到良好发挥,在工程设计中可予以考虑。Bends affect navigation,and at the same time,easy to cause soil erosion,river bed siltation and other problems.L-shaped groin group is a common hydraulic engineering structure,which can adjust the flow speed and improve the dynamic characteristics of the flow,and is used to protect the shoreline and prevent sedimentation.Most rivers in China have no fixed water level all the year round,and the influence of groin group on the flow characteristics under different water levels is worth studying,which can provide guidance for engineering practice.In this experiment,the particle image velocity measurement system and the wireless water level measuring system are used to measure and record the physical quantities such as flow velocity and water level,and the influence of groin group under different water levels on water flow is analyzed by Matlab software.The conclusions are drawn as follows:with the increase of water level,the speed of water flow gradually decreases,the downstream part of the groin group is the best position to prevent erosion and siltation,and the ratio of dam height to water depth will affect the role of groin group.When the ratio of dam height to water depth is about 2.5,the role of groin group can be well played,which should be considered in the engineering design.

关 键 词：U型弯道 L型丁坝群 坝高水深比 粒子图像测速系统 水力特性 

分 类 号：TV83[水利工程—水利水电工程]