Numerical analysis on aqueous oil transport and control strategy in a soil-water system

On the basis of field investigation in the Shenfu irrigation area and in-door tests, the authors develop a coupling model of water and solute movement to quantitatively analyze the effects of climate condition, irrigation mode, chemical reaction and different control schemes on aqueous oil (effective oil) distribution with finite difference method. It's concluded that aqueous oil in the soil mainly distributes in the plough layer rather than goes into groundwater due to the strong adsorption. In addition, the control schemes of clean-waste water mixing irrigation and crop type regulation may greatly reduce the aqueous oil concentration, but clean water irrigation must be use for the complete restoration.