Research On Experiment And Numerical Simulation Of Interference Infiltration Characteristic In Film Hole Irrigation

Based on analyzing the film hole irrigation theory and research at domestic and abroad, we use the theory analysis and simulation, simulate film hole irrigation point source infiltration feature of several typical soil by RETC and SWMS-3D, and analyze film hole irrigation infiltration feature and influencing factors. According to build the common model of film hole irrigation point source infiltration average water depth which include the film hole ratio,hole diameter,clay content and soil bulk density. On the other hand, the simulation result are verified by the loess plateau typical soil indoor test data ,and we can conclude that:1) The RETC in constant model parameter can simulate film hole irrigation infiltration feature which have various typical soil numerical value, and define the different hydraulic feature parameter in various soil. We use SWMS-3D which is a common software can simulate the 3-dimensionsoil water movement characteristics to simulate the various film hole ratio,the film hole distance and the average infiltration water depth in film hole control area of film hole diameter, we can get the Kostiakov fitting model parameters. Using simulation analyses characteristics of film hole irrigation infiltration and factors, on the basis of which build the common model of film hole irrigation point source infiltration average water depth which include the film hole ratio,hole diameter,clay content and soil unit weight.2) We take the loess plateau typical soils (Luo Chuan in shaanxi Province) to experiment indoor film hole irrigation infiltration, depending on the literature we can design the opening rate and film hole diameter, using the test results and relevant documents to the establishment of mathematical model is validated. General research results show that: the film hole irrigation infiltration coefficient increases with the increasing of film hole ratio, and decreasing with the diameter and clay content.3) The researchers designed a film hole irrigation field source infiltration device, tested the medium loam in Yangling district Shaanxi Province and the sandy loam in Wei River beach in different porosity and hole diameter in full water film under the condition of three-dimensional film hole irrigation outdoor experiments, selected infiltration loops of different diameter in infiltration experiments, adjusted film hole spacing to obtain the different porosity, and according to the actual situation of crop to design the film hole diameter and film hole spacing, and formulate the field test of film hole irrigation schemes.4) Converting the infiltration amount of film hole into the average infiltration depth in control area (referred to the average infiltration depth of film hole irrigation), study of film hole ratio and average infiltration depth we can determining reasonable irrigation technology and improve reasonable irrigation technological factors and provides theory basis. Experimental results show the relationship among the film hole accumulation infiltration,soil texture,soil bulk density,porosity and diameter of film hole. Test results show that under the same soil texture and bulk density, the cumulative amount of film hole infiltration will increase with the condition of film hole diameter. In the same film hole diameter, film hole irrigation average infiltration depth increase with the film hole rate increases.If the soil bulk density is high, the average infiltration depth will be low.