Quantitative Analysis of Influence of Air Resistance and Soil Bulk Density on One-dimensional Vertical Infiltration

The influence of air resistance and soil bulk density on infiltration rate, accumulative infiltration and wetting front was analyzed, and the average water content increment during infiltration was researched.Air resistance and soil bulk density have obvious influence on infiltration rate, accumulative infiltration and wetting front: the infiltration decrease ratio(IDR) of accumulative infiltration due to soil bulk density increment was a constant, and IDR was 31.79% and 52.03% for 1.4 g/cm~3 and 1.5 g/cm~3 soil bulk density compare to 1.3 g/cm~3 soil bulk density.The infiltration decrease ratio(IDR) of wetting front due to soil bulk density increment was not a constant which was influenced by time. The infiltration decrease ratio(IDR) of accumulative infiltration and wetting front due to air resistance was not a constant which was influenced by time. The average water content increments during infiltration were 0.377, 0.341 1 and 0.313 7 for 1.3,1.4 and 1.5 g/cm~3 soil bulk density, respectively, in condition of no air resistance.