摘要
针对弯曲河道交汇区污染物离散系数的分布特征进行研究,通过建立U形弯曲交汇河道水气两相流数学模型,进行交汇区水动力数值模拟。数学模型经试验数据验证后,模拟分析了不同汇流比对弯道交汇区水流结构和离散特性的影响,离散系数采用二维离散张量法进行计算。结果表明,支流入汇导致交汇断面附近纵向和横向离散系数达到峰值,该峰值随着汇流比的增大而增大;横向离散系数沿程分布呈现单峰结构,纵向离散系数沿程分布呈现双峰结构。
The distribution characteristics of pollutant dispersion coefficient in the confluence of a curved river with tributary are studied. The mathematical model of air-water two-phase flow in the U-shaped confluent channel is established and verified by the data of previous laboratory experiments. Based on the simulation results,the influence of different discharge ratio on the flow structure and dispersion characteristics of confluent curved river is analyzed,in which the dispersion coefficient is calculated by the two-dimensional tensor method. The results show that the dispersion coefficient reaches the peak value in the vicinity of convergence,and the peak value increases with the increase of discharge ratio. Moreover, the longitudinal dispersion coefficient shows a single peak distribution along the river,while the transversal dispersion coefficient presents a double-peak structure.
作者
顾莉
赵欣欣
戴波
吴健祎
褚克坚
GU Li;ZHAO Xinxin;DAI Bo;WU Jianyi;CHU Kejian(Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes of Ministry of Education, Hohai University, Nanjing 210098, China;National Engineering Research Center of Water Resources Efficient Utilization and Engineering safety, Hohai University, Nanjing 210098, China;Nanjing Hydraulic Research Institute,Nanjing 210029, China;College of Environment, Hohai University, Nanjing 210098, China)
出处
《河海大学学报(自然科学版)》
CAS
CSCD
北大核心
2018年第3期189-195,共7页
Journal of Hohai University(Natural Sciences)
基金
国家自然科学基金(51379058
51479064)
中央高校基本科研业务费专项资金(2016B06714)
关键词
离散系数
弯曲交汇河道
汇流比
二次环流
数值模拟
离散张量
dispersion coefficient
confluent curved river
discharge ratio
secondary flow
numerical simulation
dispersion tensor