关键词: 溶质运移, LAF（linear-asymptotic function）模型, ADE(advection-dispersion equation)模型, 弥散, 弥散度

Abstract: To quantify the non-Fickian transport in porous media, a linear function was employed to characterize the relationship between the dispersivity and migration distance, a mathematical model LAF(Linear-Asymptotic Function) was presented, solute transport tests in one-dimensional glass column were carried out, and the accuracy of LAF was contrasted with the traditional ADE (advection-dispersion equation) models according to experimental data. The results show that, although the flow satisfies Darcy’s law, there are some differences between the experimental values and the fitted values obtained from the ADE model treating the dispersivity as a constant(the maximal error value being 1.57 g/L).#br##br##br##br#The simulation accuracy is enhanced when the dispersivity is treated as a linear function of LAF:#br##br# the maximal error value is 0.62 g/L. It can better simulate solute transport in the homogeneous finite column. These conclusions have been obtained in homogeneous media. The situation is more complicated in heterogeneous porous media, and the mechanism needs further research.

Key words: solute transport, LAF（linear-asymptotic function） model, ADE (advection-dispersion equation) model, dispersion；dispersivity