Infiltration model and numerical simulation of the soil water movement in furrow irrigation

Based on unsaturated soil water movement theory,the mathematical model of furrow irrigation is developed to un-derstand the characteristic of Two-dimensional soil water movement in furrow irrigation.The simulation results are verified by the laboratory experiments and agreed well with the experiments measurement values,which shown that the mathematical model can be used to study the two-dimensional soil water infiltration in furrow irrigation.The soil wetted volume characteristic of furrow irrigation are simulated and analyzed under different factor combination by this model,the results indicate that soil initial water content and furrow spacing have slight effect on the accumulation infiltration quantity of furrow irrigation,meanwhile the soil character,bulk density,water depth and bottom width have obvious effect on the accumulation infiltration quantity.The bottom width and soil initial water content have a littler influence on the wetting pattern and the wetting soil movement migration,but the soil character and bulk density have a great influence on it.The water depth and furrow spacing have an effect on the water contribution near the zero flux plane,the vertical moist front migration has accelerated after interference infiltration near the zero flux plane.Taking these results as the foundation,the two-dimensional infiltration model for furrow irrigation was established which contained the wetted perimeter.