Effects of runoff from upslope on rainfall infiltration and soil water redistribution at a planar slope

The effects of runoff from upslope on rainfall infiltration,wetting front movement and soil water redistribution are studied based on the simulated rainfall at a planar slope,while soil erosion is prevented during rainfall infiltration and evaporation is stopped during soil water redistribution.The results show that when initial soil water content is very low,the infiltration rate at hillslope with runoff from upslope has an increasing process but the average one decreases,compared with the rainfall infiltration without runoff from upslope.Runoff from upslope has a marked effect on wetting front movement at the beginning of rainfall infiltration due to upslope runoff infiltration,and then has a little effect,which implies that the wetting front movement mostly depends on the matric suction.The wave distribution of soil water along hillslope results from the fluctuation of overland flow,upslope runoff infiltration,and lateral downslope flow.