摘要
为了研究黄河干流与支流交汇河段水质演变趋势,从水环境系统变化规律出发,以黄河小北干流与汾河入黄河交汇河段为研究区域,建立实尺度三维大涡模拟模型,实现高精度污染物传输模拟。结果表明:汾河入黄河干流交汇口横断面流速不均匀系数大,水流流速分布不均,紊动能最大值为0.036 m^(2)/s^(2),汇合口下游左岸形成了较大范围的低流速区,引起污染物滞留;受地形影响,在汾河入黄后污染物在汾河入黄口下游形成约11 km长的污染带;计算区域河段宽深比大,污染物垂向混合扩散效应极小,扩散过程以二维为主,污染物横向扩散梯度与水体紊动能分布显著相关。
In order to investigate the evolution trends of water quality in the main stream and tributaries of the Yellow River Basin and based on the change law of the water environment system, the Fen River into the lower north main stream of the Yellow River was taken as the research section, and the real-scale large eddy simulation model was established to realize high-precision simulation. The results show that the confluence of Fen River into the Yellow River has a large coefficient of uneven flow velocity and uneven flow velocity distribution, and the maximum turbulent energy is 0.036 m^(2)/s^(2). A wide range of low flow velocity zones are formed in the left bank downstream of the confluence, causing the retention of pollutants. Affected by the topography, a pollution zone of about 11 km downstream the confluence of the Yellow River and the Fen River is formed. The vertical mixed diffusion effect of pollutants in the calculated area is very small due to the large width-depth ratio, and the diffusion process of pollutants is mainly characterized by two-dimensional distribution. The lateral diffusion gradient of concentration is significantly correlated with the distribution of turbulent kinetic energy in water.
作者
余真真
朱海
毛颂平
闫莉
张雷
赵丽萍
YU Zhenzhen;ZHU Hai;MAO Songping;YAN Li;ZHANG Lei;ZHAO Liping(Yellow River Water Resources Protection Institute,Zhengzhou 450004,China;College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;Yellow River Institute of Hydraulic Research,Zhengzhou 450003,China)
出处
《人民黄河》
CAS
北大核心
2022年第4期100-106,共7页
Yellow River
基金
国家自然科学基金资助项目(51709126,51779101)
中国博士后基金项目(2016M601710)。
关键词
黄河小北干流
汾河入黄河段
大涡模拟
复杂水动力条件
污染物浓度场
Lower north main stream of Yellow River
confluence of main stream and Fen River
large eddy simulation
complex hydrody⁃namic conditions
pollutant concentration field
