The migration of light organic liguids in an unsaturated-saturated zone of the soil

الملخص EN

A one-dimensional finite difference model for the simultaneous movement of light non-aqueous phase liquid (LNAPL) and water through unsaturated-saturated zone of the soil in a three fluid phase system with air assumed constant at atmospheric pressure is developed.

The flow equations described the motion of light non-aqueous phase liquid and water are cast in terms of the wetting and non-wetting fluid pressure heads respectively.

The finite difference equations are solved fully implicitly using Newton-Raphson iteration scheme.

The present numerical results are compared with results of Kaluarachchi and Parker (1989) and there is a good agreement between them.

The present model can be used to simulate various transport problems in a good manner.

Results proved that the maximum LNAPL saturation occurred below the source of the contaminant during LNAPL infiltration.

During redistribution, the LNAPL saturation had a maximum value at the advancing of the LNAPL infiltration front.