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| Applicability of infiltration models to line source length under vertical line source |
| CHENG Huijuan1, YU Qingfeng1*,WANG Quanjiu2,3,4 |
| 1. Vocational and Technical College of Inner Mongolia Agricultural University, Baotou, Inner Mongolia 014109, China; 2. Institute of Water Resources, Xi′an University Technology, Xi′an, Shaanxi 710048, China; 3. Research Center of Soil and Water Conservation and Ecological Environment, Chinese Academy of Sciences & Ministry of Education, Yangling, Shaanxi 712100, China; 4. State Key Laboratory of Soil Erosion and Dry land Farming on the Loess Plateau, Northwest A&F University, Yangling, Shaanxi 712100, China |
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Abstract The law of soil moisture infiltration under vertical line source irrigation was analyzed to investigate the infiltration rate and cumulative infiltration volume of different line source lengths, through the indoor soil box simulation test, three conventional infiltration models for the applicability of the infiltration law of different line source lengths were studied. The results show that the infiltration rate and cumulative infiltration volume increased with the length of the line source, all three models can simulate the infiltration law under different line source lengths, where the Kostiakov infiltration formula was the most accurate, the Philip infiltration model was more suitable for the simulation of the early and middle infiltration. Horton(deformation)infiltration formula was more suitable for the simulation of the middle and late infiltration. It was more suitable for the case where the length of the line source was greater than 20 cm. The empirical formulas of the three infiltration models under different line source lengths were obtained, the infiltration rate of the three infiltration models was higher than that of the cumulative infiltration volume, and the calculated value of cumulative infiltration amount of three infiltration models was higher than the measured value. The research results can provide a theoretical basis for the popularization and application of vertical line source irrigation technology.
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Received: 12 March 2020
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