The effect of initial moisture content and rain (sprinkler) intensity on wetting front advance during rain (sprinkler) infiltration |
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| Institution: | 1. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China;2. Global Institute for Water Security & School of Environment and Sustainability, University of Saskatchewan, Saskatoon, Saskatchewan S7N 3H5, Canada;1. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, Sichuan 610059, China;2. School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA, USA;1. Department of Geological Engineering, Chang''an University, Xi''an 710054, Shaanxi, China;2. Key Laboratory of Western China Mineral Resources and Geological Engineering, Ministry of Education of China, Xi''an 710054, Shaanxi, China;3. Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;4. Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, China;5. University of Chinese Academy of Sciences, Beijing 100049, China;6. Beca Ltd., P.O. Box 6345, Auckland, New Zealand;7. School of Architecture, Building and Civil Engineering, Loughborough University, Loughborough LE11 3TU, United Kingdom;1. MOE Key Laboratory of Mechanics on Disaster and Environment in Western China, Department of Geological Engineering, Lanzhou University, Lanzhou, Gansu Province 730000, China;2. Research Center on Landslides, Disaster Prevention Research Institute, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan |
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| Abstract: | A laboratory experiment was carried out on a 5 cm inside diameter by 70 cm long column of silty clay soil under five initial moisture contents, and five sprinkler intensities using a sprinkler simulator. A general equation was derived taking into account the initial moisture content and water application rate, to compute the wetting front advance during sprinkler infiltration. The experimental results strongly supported the derived equation, and the wetting front advance could be predicted under any combination of initial moisture content and sprinkler intensity. The study also revealed that the advance of wetting front increases either by increasing the sprinkler intensity or initial moisture content.The numerical solution of the partial differential equation of water flow offered by HANKS et al. (1969) was applied to compute the wetting front advance during the sprinkler infiltration. A good agreement was found between the two methods of computations; the derived equation and the differential equation. However, the solution of the partial differential equation needs very accurate estimation of K ? Θ and ψ ? Θ relation-ships to achieve reliable results. |
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