水质扩散系数在伶仃洋水域水体交换中的影响分析  

Analysis of Effect of Water Quality Diffusion Coefficient on Water Exchange in the Lingdingyang Bay

作　　者：方神光 

机构地区：[1]珠江水利委员会珠江水利科学研究院,广东广州510611

出　　处：《海洋科学进展》2012年第2期177-185,共9页Advances in Marine Science

基　　金：国家自然科学基金--珠江河口盐水入侵对有机污染物的影响机理研究(51109232);广东省自然科学基金--珠江河口盐水异重流对有机污染物的影响机理研究(10151061101000001)

摘　　要：选取珠江河口伶仃洋水域为例,建立了贴体曲线坐标系下的二维珠江河口水流数学模型,并采用纯隐格式的混合有限分析法对数学模型进行了离散和求解。在对模型验证的基础上,针对珠江河口伶仃洋水域中的水质扩散系数选取问题进行了分析和探讨。研究表明,主潮汐通道水体的置换率基本不受扩散系数取值的影响,扩散系数的影响主要体现在远离伶仃洋主潮汐通道和示踪剂浓度分界线的水域,并初步推荐了该水域示踪剂扩散系数的取值范围。A two-dimensional mathematical model under the body-fitted curvilinear coordinates was built for the flow in the Lingdingyang Bay of the Zhujiang Estuary and the pure implicit scheme of hybrid finite analytic method was used to discrete and solute the equations. Based on the validation of the mathematical model, the selection of water quality diffusion coefficient values for the Lingdingyang Bay was discussed and analyzed. It is shown that the rate of water exchange within the main tidal channel is basically not af- fected by the selection of water quality diffusion coefficient values. The influence of the diffusion coeffi- cient emerges mainly in the waters far away from the main tidal channel in the Lingdingyang Bay and from the tracer concentration boundary. The range of the diffusion coefficient values to be selected in the Ling- dingyang Bay has been preliminarily recommended.

关 键 词：扩散系数 水体交换 伶仃洋 数学模型 

分 类 号：X55[环境科学与工程—环境工程]