Capability of convection-dispersion transport mode to predict transient water and solute movement in undisturbed soil columns

摘要

The capacity of the convection-dispersion model coupled with the Richards equation to predict transient transport of water and solutes in porous media is studied in a laboratory soil column. The solutes used are ~3H_2O as a conservative tracer and ~14C-labeled dibutylphthalate (DBP)as a sorbing solute. To account for multiple nonideal transport processes, a model was developed that may consider hysteresis of the water retention curve, sorption nonequilibrium (sorptin kinetics and sorption hysteresis)and mobile and immobile water domains during solute transport.