河流混合污染物浓度二维移流扩散研究  

Two-dimensional Migration and Diffusion Analysis of Mixed Pollutant Concentration in Rivers

作　　者：宁秀美 Ning Xiumei(Ningxia Institute of Environmental Sciences(Limited Liability Company),Yinchuan 750002,China)

机构地区：[1]宁夏环境科学研究院(有限责任公司),宁夏银川750002

出　　处：《环境科学与管理》2023年第12期56-60,84,共6页Environmental Science and Management

摘　　要：河流混合污染物浓度移流扩散,采用稳态运移原理构建污染物移流扩散模型,忽略垂向扩散时间的影响,使得分析结果不准确。为此,提出河流混合污染物二维移流扩散分析。根据污染物排入河流后的空间扩散特征,计算污染物在岸边和中心排放条件下的浓度分布,参照水体模型对污染物的影响范围,计算污染物水平和垂向的扩散时间,构建污染物浓度二维移流扩散模型,采用有限体积法求解模型,得到模型的解析解,实现对污染物浓度二维移流扩散过程的分析。实验结果表明,所提方法能够准确模拟污染物浓度二维移流扩散过程,分析结果较为可靠。In this paper,the steady-state migration principle is used to construct the migration diffusion model of the mixed pollutant concentration in rivers.The influence of vertical diffusion time is ignored,which makes the analysis results inaccurate.For this reason,a two-dimensional drift diffusion analysis of river mixed pollutants is proposed.According to the spatial diffusion characteristics of pollutants discharged into the river,the concentration distribution of pollutants at the bank and central discharge conditions was calculated.The level and vertical diffusion time of pollutants were calculated with reference to the influence range of the water body model on pollutants,and the two-dimensional displacement diffusion model of pollutant concentration was constructed.The finite volume method was adopted to solve the model and the analytical solution of the model was obtained.The two-dimensional drift diffusion process of pollutant concentration is analyzed.The experimental results show that the proposed method can accurately simulate the two-dimensional drift diffusion process of pollutant concentration,and the analytical results are reliable.

关 键 词：河流 混合污染物 污染物浓度 二维扩散 

分 类 号：X522[环境科学与工程—环境工程]