Study on Ponded Water Infiltration and Soil Water Redistribution in Red Soil

Laws of water infiltration and soil water redistribution in red soil were studied through indoor soil column simulated experiments. During infiltration period, the depth of wetting front and the infiltration volume had a linear relation with the square root of time, the velocity of wetting front had a power relation with time, and the infiltration rate had a linear relation with the reciprocal of the square root of time. During redistribution period, soil water content decreased with soil depth, and soil water content at the same depth decreased with time under preventing evaporation conditions. Regardless of preventing evaporation or not, soil water suction decreased firstly and then increased with the increase of soil depth, and soil water suction at the same depth increased with time. In addition, the original soil water content significantly influenced infiltration and redistribution. The lower the original soil water content was, the quicker the water infiltrated and the slower the water redistributed.