基于欧拉-拉格朗日分裂法的供水管网多组分水质模拟  

Multicomponent Water Quality Simulation with Axial Dispersion Solved by Eulerian-Lagrangian Operator-splitting Method in Water Distribution System

作　　者：陈国强[1] 龙天渝[1] CHEN Guo-qiang;LONG Tian-yu(College of Environment and Ecology,Chongqing University,Chongqing 400045,China)

机构地区：[1]重庆大学环境与生态学院

出　　处：《中国给水排水》2019年第21期69-74,共6页China Water & Wastewater

基　　金：国家“十二五”科技支撑计划项目(2012BAJ25B06-003)

摘　　要：供水管网中的水质模型通常为对流反应方程,往往忽略扩散项。在水质模型中加入扩散项,并探讨了水质模拟中扩散效应的影响。采用一种适用于供水管网的欧拉-拉格朗日分裂算子法求解多组分(有机质、余氯和微生物量)传质反应模型的对流扩散反应方程组,并应用于动态水力条件下的算例管网中。实例证明,下游节点的污染物浓度随时间逐渐积累增加,尤其在管网终端扩散效应显著。相比有机质和余氯的浓度变化,轴向扩散效应和径向传质反应效应相互促进的综合效应使得微生物量显著变化,低流速情况下表现更为明显。Water quality models in water distribution system are usually convective reaction equations,and diffusion terms are often neglected.The effects of water quality simulation results by embedding axial dispersion into the classical advective-reactive model in water distribution system were explored.The Eulerian-Lagrangian operator-splitting method was employed to solve the model with axial dispersion.The results showed that contaminant concentration at downstream node was gradually accumulated with time along the upstream pipelines from the source,which was particularly reflected in the terminal.Compared with the changes of organic matter and residual chlorine,the biomass concentration might demonstrate synthetic effects of axial dispersion and reaction which were mutual promotion,and it was particularly reflected in the low flow velocity.

关 键 词：供水管网 多组分水质模拟 欧拉-拉格朗日分裂算子法 EPANET-MSX 轴向扩散 

分 类 号：TU991[建筑科学—市政工程]