| Simulation of soil infiltration characteristics under different wetted soil percentage |
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| DOI：10.7606/j.issn.1000-7601.2016.04.02 |
| Key Words: drip irrigation wetted percentage infiltration characteristics soil water content numerical simulation |
| Author Name | Affiliation | | WANG Ping | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China | | HU Xiao-tao | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China | | WANG Wen-e | Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| Designed wetted percentage and dripper discharge are two important parameters in the design of drip irrigation system, affecting the size of wetted body and growth status of plant. With the aim of elucidating the influence of dripper discharge and thereby designing wetted percentage according to soil moisture migration and wetting soil characteristic, this paper based on the theory of unsaturated dynamics and the characteristics of soil moisture transfer under drip irrigation, and established a model of soil water movement, HYDRUS-3D software, to solve the soil infiltration model under different wetted soil percentage. The contrast of measured and simulated values showed that at the end of irrigation, the relative error between simulated and measured values of each observation point were less than 10%, and those for wetted soil percentage were 4.75%～11.78%. By simulating the wetted soil moisture migration under different condition using the established model, we obtained the rule of wetting body characteristics. Dripper discharge mainly affected the migration distance in horizontal direction, design wetted soil percentage had a greater influence on vertical direction. When the dipper discharge is the same, the larger the design wetted soil percentage, the greater the average moisture content in wetted body and the bigger radius of high water zone (water content>0.410 cm3·cm-3). When the design wetted percentage was the same, the radius of high water cut in wetted body increased as the dripper discharge increased. |
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