基于COHERENS模型的污染物质输运数值模拟  

Numerical Simulation of Three-dimension Flow and Pollutant Transportation of Tidal River Based on COHERENS Model

作　　者：华祖林[1] 顾莉[1] 查玉含[1] 刘晓东[1] 

机构地区：[1]河海大学环境科学与工程学院浅水湖泊综合治理与资源开发教育部重点试验室,江苏南京210098

出　　处：《环境科学与技术》2009年第4期14-18,共5页Environmental Science & Technology

基　　金：国家自然科学基金项目资助(50679019和50009001);江苏省自然科学基金项目资助(BK2000004);江苏省社会发展科技计划项目(BS2006095)

摘　　要：以COHERENS模型为基础,建立了长江下游感潮河段三维水流及污染物质输运数学模型,该模型通过σ坐标变换,使整个水域垂直方向可采用相同的分层。基于模态分裂法,将三维流动分成表面重力波(外模式)和内重力波(内模式);模型求解技术上采用算子分裂法,使用了superbee限制器TVD格式,减小非物理的数值虚拟震荡。选取长江常熟段为例,模型较好的模拟了感潮河段三维流场及污染带分布特征。该成果对感潮地区污染物输运规律及水污染控制具有指导意义。Based on COHERENS model, mathematical model of three-dimensional flow and mass transport in the downstream Yangtze tidal river was established. Through coordinate transformation in the control equations, the same layer grids in vertical direction were used to fit for local topography. Mode-splitting method for surface gravity waves and internal gravity waves was used in the model. The operator splitting method was used to solve the control equations, and TVD scheme with superbee limiter was used to reduce the fictitious numerical oscillations. Three-dimensional flow field and pollutant distribution in Changshu section of the Yangtze River were well simulated by the use of the model. The study is useful for waste pollution control in the tidal river.

关 键 词：感潮河段 COHERNES模型 数值模拟 物质输运 

分 类 号：X522[环境科学与工程—环境工程]