Study On The Influence Of Different Underlying Surface Treatment On Rainfall Infiltration Law Based On Hydrus-2d

Therefore,the utilization of rainfall and irrigation water should be based on the principle of high efficiency and conservation.In recent years,the implementation of water-saving irrigation techniques such as drip irrigation under film has improved the water use efficiency,but the ridging and mulching treatment of drip irrigation under film have changed the conditions of farmland underlying surface to a certain extent,and the infiltration process of rainfall will be affected to a certain extent.In order to analyze the effects of film mulching and ridging on rainfall infiltration process,two different underlying surface treatments,film-mulching ridging and level,were selected to observe the soil moisture content changes before and after natural rainfall,and two different underlying surface treatments were selected in the experiment,that is,film-mulching ridging and level of the ground.At the same time,Hydrus-2D was used to simulate the field data to increase the surface of ridging without film,and to compare and summarize the rainfall infiltration law of three kinds of underlying surface under different rainfall intensity conditions.The experimental data analysis results show that:(1)By comparing the accumulated infiltration amount under different rainfall intensity,the accumulated infiltration amount of the flat surface is larger than that of the film-covered ridge-forming,which shows that the soil water infiltration capacity is weakened by the film-mulching and ridge-forming,and the soil water infiltration capacity is weakened by the film-mulching and ridge-forming.However,when rain intensity is large,there is little difference between the infiltration amount of the flat ground and the ridging of the film.(2)Rainfall intensity also affects the distribution of monitoring profiles on different underlying surfaces.At the initial stage,the relationship between infiltration and rain intensity is positive,but when the rainfall intensity reaches 40mm/h,the infiltration volume does not increase but decreases.At the same time,this rule also has a synchronous reaction in the wet front movement and so on.(3)The soil moisture content,infiltration depth,cumulative infiltration amount and wet front migration under the condition of ridging and film mulching are lower than those of the flat ground,but with the increase of rainfall duration,the soil moisture content,infiltration depth and wetness front movement are lower than those of the flat ground under the condition of ridging and film mulching.The difference between the two underlying surfaces decreases gradually,and the infiltration of the flat surface decreases when the rainfall conditions are dispersed for a long time.(4)To study the effect of film ridging on the rule of rainfall infiltration,and to providereference for irrigation water consumption.When the conditions of scattered rainfall are mostly in the study area,ridging with film mulching can reduce irrigation water consumption more efficiently.