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一、弥散理论及弥散系数概述 1.弥散作用 由于可溶解物质进入地下水系统中的随即逐渐扩展,就宏观的扩展范围而言,是超出地下水流按平均流速应该分布的范围;就微观的扩展浓度而言,可溶解物质只有在开始与地下水流相接触时有明显的浓度分界面,随后此分界面即在可溶解物质的扩展中消失。在水力学中,通过多孔介质的流动可由达西定律来表述,它是以断面平均值为对
First, the dispersion theory and dispersion coefficient overview 1. Dispersion As the dissolution of substances into the groundwater system then the gradual expansion of the macroscopic expansion of the scope, is beyond the groundwater flow should be based on the average flow rate of the range; the microscopic expansion of the concentration In this case, the soluble material has a clear concentration interface only when it begins to come into contact with the groundwater flow, and then the interface disappears as the soluble material expands. In hydraulics, the flow through porous media can be described by Darcy’s law, which is based on the average cross-section