Numerical simulation of wind-driven circulation and pollutant transport in Taihu Lake based on a quadtree grid  

作　　者：Xiao-dong Liu Ling-qi Li Peng Wang Zu-lin Hua Li Gu Yuan-yuan Zhou Lu-ying Chen 

机构地区：[1]Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes of Ministry of Education,Nanjing 210098,China [2]College of Environment,Hohai University,Nanjing 210098,China

出　　处：《Water Science and Engineering》2019年第2期108-114,共7页水科学与水工程（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grants No.51739002 and 51479064);the World-Class Universities(Disciplines)and Characteristic Development Guidance Funds for the Central Universities;the Priority Academic Program Development(PAPD)of Jiangsu Higher Education Institutions(Grant No.PPZY2015A051)

摘　　要：In this study,a two-dimensional flow-pollutant coupled model was developed based on a quadtree grid.This model was established to allow the accurate simulation of wind-driven flow in a large-scale shallow lake with irregular natural boundaries when focusing on important smallscale localized flow features.The quadtree grid was created by domain decomposition.The governing equations were solved using the finite volume method,and the normal fluxes of mass,momentum,and pollutants across the interface between cells were computed by means of a Godunov-type Osher scheme.The model was employed to simulate wind-driven flow in a circular basin with non-uniform depth.The computed values were in agreement with analytical data.The results indicate that the quadtree grid has fine local resolution and high efficiency,and is convenient for local refinement.It is clear that the quadtree grid model is effective when applied to complex flow domains.Finally,the model was used to calculate the flow field and concentration field of Taihu Lake,demonstrating its ability to predict the flow and concentration fields in an actual water area with complex geometry.In this study,a two-dimensional flow-pollutant coupled model was developed based on a quadtree grid.This model was established to allow the accurate simulation of wind-driven flow in a large-scale shallow lake with irregular natural boundaries when focusing on important smallscale localized flow features.The quadtree grid was created by domain decomposition.The governing equations were solved using the finite volume method,and the normal fluxes of mass,momentum,and pollutants across the interface between cells were computed by means of a Godunov-type Osher scheme.The model was employed to simulate wind-driven flow in a circular basin with non-uniform depth.The computed values were in agreement with analytical data.The results indicate that the quadtree grid has fine local resolution and high efficiency,and is convenient for local refinement.It is clear that the quadtree grid model is effective when applied to complex flow domains.Finally,the model was used to calculate the flow field and concentration field of Taihu Lake,demonstrating its ability to predict the flow and concentration fields in an actual water area with complex geometry.

关 键 词：Numerical simulation WIND-DRIVEN CIRCULATION POLLUTANT transport QUADTREE GRID Shallow-flow hydrodynamics Taihu Lake 

分 类 号：TV[水利工程]