连续弯曲河道点源污染物输运特性三维数值模拟  

Three-dimensional numerical simulations of transport characteristics of point source pollutant in a sinuous open channel

作　　者：陆圣杰 朱海[1] 徐洁如 王玲玲[1] 华祖林[2] 武显扬 LU Shengjie;ZHU Hai;XU Jieru;WANG Lingling;HUA Zulin;WU Xianyang(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;College of Environment,Hohai University,Nanjing 210098,China;College of Landscape Architecture,Nanjing Forestry University,Nanjing 210037,China)

机构地区：[1]河海大学水利水电学院,江苏南京210098 [2]河海大学环境学院,江苏南京210098 [3]南京林业大学风景园林学院,江苏南京210037

出　　处：《水利水电科技进展》2023年第2期16-26,共11页Advances in Science and Technology of Water Resources

基　　金：国家重点研发计划(2021YFC3200403);中央高校基本科研业务费专项(B200204044);中国长江三峡集团有限公司科研项目(202003251)。

摘　　要：为研究连续弯道水流中污染物的输运过程,参考连续弯道水流标量示踪试验,构建了水动力-污染物耦合三维大涡模拟数值模型,分析了点源污染物不同横向和垂向释放位置对下游河道污染物浓度分布特性的影响。结果表明:连续弯道内的纵向流速、涡量与紊动能大小存在关联且二次环流对污染物的输运及混合起主导作用;点源在连续弯道进口的横向和垂向布设位置将显著影响污染物的混合速率和空间分布范围;当点源在横向上布置于弯道进口中心和中心偏凸岸处,或在垂向上布置于弯道进口底床或水深中间处,下游污染物的混合速率最大,且影响范围更广;近场的污染物混合速率和影响范围呈正相关关系;连续弯曲河道中,点源位置的差异对污染物混合的影响主要体现在单个周期的弯道内。To investigate the process of pollutant transport in sinuous open channel flow,a 3D hydrodynamic-pollutant coupled large-eddy simulation model was established according to the scalar tracer experiment.The influence of different release positions in transverse and vertical directions of point source on the concentration distribution in the downstream was analyzed.The results show that the streamwise velocity,vorticity and turbulent kinetic energy have clear relations and the secondary currents exert dominant impact on transport and mixing.Besides,the variance in transverse and vertical position of point source has significant influence on mixing efficiency and spatial distribution of pollutant.Specifically,the point source placed near the center of cross section in transverse direction or near the bottom of channel in vertical direction will result in a higher mixing efficiency and a wider influence range.There exists a positive correlation relationship between mixing rate and distribution range in the near field.The variance of point source position in a sinuous open channel mainly influences the pollutant’s mixing within a single period.

关 键 词：连续弯道水流 点源污染物 输运特性 混合规律 大涡模拟 

分 类 号：TV133[水利工程—水力学及河流动力学]