波浪作用下污染物的混合和离散  

Mixing and dispersion of pollutant under the action of water waves

作　　者：袁德奎[1] 林斌良 陶建华[1] 

机构地区：[1]天津大学力学系,天津300072 [2]SchoolofEngineering,CardiffUniversity,UK

出　　处：《水利学报》2004年第8期76-80,共5页Journal of Hydraulic Engineering

基　　金：国家自然科学基金资助项目(59839330);英国皇家协会资助项目(Q809)

摘　　要：本文建立了基于Sigma坐标的对流扩散数学模型,提出了通过数值模拟结果计算波浪场中纵向离散系数的方法,并通过数值模拟对波浪作用下污染物的混合和离散进行了研究。文中研究了水质点垂向振动和波浪参数对混合过程和纵向离散系数的影响;非各向同性扩散系数对纵向离散系数的影响;以及扩散系数的垂向分布对纵向离散系数的影响。研究结果表明,水质点的垂向速度对纵向离散系数有显著影响;若按波浪场中常用的湍流模型确定湍动扩散系数的分布规律,扩散系数的垂向分布对纵向离散系数的影响并不明显。An advection-diffusion model in Sigma coordinates is developed to study the mixing and dispersion of pollutant in water under the action of wave and the method for calculating the longitudinal dispersion coefficient is proposed. The effect of vertical oscillation of water particles and the effect of waves parameters on mixing process and diffusion coefficient are investigated.Furthermore, the effect of anisotropic diffusion coefficient on longitudinal dispersion coefficient and the effect of vertical distribution of diffusion coefficient on longitudinal dispersion coefficient are also studied. It is concluded that the vertical velocity of water particles may magnificently affect the dispersion coefficient and the vertical distribution of diffusion coefficient will not remarkably affects the longitudinal dispersion coefficient.

关 键 词：混合 离散 波浪 垂向分布 Sigma坐标 

分 类 号：X55[环境科学与工程—环境工程]