Numerical Simulation of Red Soil Water Infiltration under Bubbled Irrigation Condition

Based on the indoor bubbled irrigation experiment, the mathematical model of soil water infiltration is established according to the movement theory of unsaturated soil water, and it is solved by the software of HYDRUS-3D. The relative error between the simulated value and the measured value of soil water content is small, and the two values have good consistency, so the model can be used to simulate the red soil water infiltration under bubbled irrigation condition with HYDRUS-3D.The simulation result shows that the characteristic value of soil water movement increases with the increase of flow rate, and its latitude decreases with the time, the inflow is directly proportional to the migration speed of wetting front and the increase rate of soil moisture content, the relationship between soil water content and infiltration flow is equal proportion when the infiltration is stable.