| Abstract: | A coupled convective-dispersive model was developed to describe the solute movement of four ionic species (Ca2+, Na+, SC42 and CI) through soil. The model considers precipitation and dissolution of calcium sulfate as well as cation exchange or adsorption during steady-state water flow in saturated soil columns. With the model hypothetical miscible displacement experiments were carried out. The governing partial differential equations were solved numerically with an implicit Crank-Nicolson scheme. With the use of obtained results the effect of various model parameters on the shape of the calculated breakthrough curves was investigated. It was found that the processes of dissolution and precipitation, cation exchange or adsorption do have a definite influence on the shape of the breakthrough curves. |
