南水北调中线沉藻池布置方案优化  

Optimization of layout plan for the sedimentation tank of the Middle Route of South-to-North Water Transfers Project

作　　者：吴永妍 李书友 郭辉[3] 刘少华 黄明海[3] WU Yongyan;LI Shuyou;GUO Hui;LIU Shaohua;HUANG Minghai(Changjiang Institute of Survey,Planning,Design and Research Corporation,Wuhan 430010,China;South-to-North Water Diversion Middle Route Industrial Development Co.,Ltd.,Beijing 100038,China;Changjiang River Scientific Research Institute of Changjiang Water Resources Commission,Wuhan 430010,China)

机构地区：[1]长江勘测规划设计研究有限责任公司,武汉430010 [2]南水北调中线实业发展有限公司,北京100038 [3]长江水利委员会长江科学院,武汉430010

出　　处：《南水北调与水利科技（中英文）》2024年第4期798-809,共12页South-to-North Water Transfers and Water Science & Technology

基　　金：国家重点研发计划项目(2021YFC3200202);长江勘测规划设计研究有限责任公司自主研发项目(CX2019Z01)。

摘　　要：南水北调中线总干渠联通工程处拟新建沉藻池,实现总干渠藻类等混合物集中沉降和处理。通过现场试验研究总干渠水体藻类等混合物沉降特性,并采用二维水动力数值仿真分析沉藻池在设计工况条件下的水流特性,提出导流墩的优化布置思路。结果表明:在水深基本一致条件下,随着断面平均流速的增加,有效沉降距离增加,有效沉降率有所降低;在沉藻池初始设计方案下,藻类等混合物可在沉藻池内进行沉降,但沉藻池利用效率不足;布置纵向导流墩后,可有效改善沉藻池内水流平顺性和水体交换能力;在设计工况下,沉藻池内回流区水域面积占比从57%降低至7%,池内水流平均流速从约0.10 m/s降低至约0.07 m/s,平均水龄从约18 h降低至约6 h。研究成果可为中线沉藻池工程布置提供基本技术支撑。South-to-North Water Transfers Project is a large-scale water diversion project to alleviate the severe shortage of water resources in northern China.Practical experience show that algae can grow rapidly under specific conditions along the main canal.The mixture of algae residues moves with water flow and is prone to siltation in the static water area near the discharge gate and diversion outlet,as well as in the front pool of the pumping station.Therefore,algae sedimentation tank was proposed to build near the Middle Route of South-to-North Water Transfers Project to settle the algae and other mixtures in the main canal.Due to being short of universal standard for the design of sedimentation tanks,the required planar distance for settling algae and other mixtures need to be studied,so as to provide key design parameters for its engineering layout.The method of on-site experiments was used to study the sedimentation characteristics of algae and other mixtures in the main canal of the Middle Route Project.In this way,the effectiveness of the length of the sedimentation tank could be estimated.Then,the method of numerical simulation was adopted to analyze the water flow characteristics in the sedimentation tank under design condition.The existing plan may not be effective in settlement efficiency.Thus,some improved schemes were proposed characterized by setting diversion piers,and their effects were explored by numerical simulation.The results indicated that with the increase of the average flow velocity,the effective settlement distance increases while the effective settlement rate decreases, when the water depth is basically the same. For the initial design scheme, the mainstream leans towards the left side of the tank, and there is a large area of low flow velocity reflux on the right side of the tank, which accounts for about 57% of the total area. When longitudinal diversion piers were arranged evenly along the cross-section in the inlet diffusion zone, the percentage of water area of the recirculation zone in

关 键 词：南水北调中线 沉藻池 工程布置 导流墩 沉降距离 

分 类 号：TV135.3[水利工程—水力学及河流动力学]