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 affected by the selection of water quality diffusion coefficient values. The influence of the diffusion coefficient 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 Lingdingyang Bay has been preliminarily recommended.
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