虽然达西定律描述了在孔隙介质中流体的宏观流动方式，但是它没有给出有关的分子弥散流动的情况。
Though Darcy's law describes the macro flow model in porous media, it doesn't consider the molecule's dispersion flow.
非均匀介质中的弥散过程是依赖距离的，这起源于非均质结构的多尺度性质。
The dispersion process in heterogeneous porous media is distance dependent, which result from the multi scaling property of heterogeneous structure.
放射性核素在地质介质中的迁移，除了受到地下水的对流-弥散作用外，还受到地下水中多种化学作用的影响。
Migration of radionuclides in geologic media is controlled by not only convection-dispersion effect but also many chemical processes.
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