Numerical analysis for transport and distribution of light non-aqueous phase liquids in homogeneous vadose zone

The numerical simulation for transport and distribution of Light non-aqueous phase liquids in homogeneous vadose zone was carried out. The results shows that the migration discipline of light non-aqueous phase liquids are different with water-soluble contaminants. The down rates and distribution law of light non-aqueous phase liquids related with media permeability and water holding capacity,also both shows the upper part of the capillary with a residual area and gathered zone rules in homogeneous media. The coarse granular media while making the oil phase down fast, but threat to groundwater smaller. Despite the downward speed of light non-aqueous phase liquids in fine-grained media is slower, it remain in the soil more than in coarse granular media,once the oil phase come into the capillary zone with a gathering area, it can easily give risky to groundwater overcoming the capillary force backwater. The paper provide theoretical basis on diesel pollution control and reparation effectively.