Determination of infiltration rate from border irrigation advance and recession trajectories |
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| Institution: | 1. Department of Marine Science, University of Otago, Dunedin, New Zealand;2. School of Biological Sciences, Victoria University of Wellington, Wellington 6140, New Zealand;3. Department of Biological Sciences, University of Cape Town, Cape Town, South Africa;4. Key Laboratory of Freshwater Animal Breeding, Ministry of Agriculture, College of Fisheries, Huazhong Agricultural University, Wuhan 430070, PR China;5. Freshwater Aquaculture Collaborative Innovation Center of Hubei Province, Wuhan 430070, PR China;6. Wriggle Coastal Management Limited, P.O. Box 1622, Nelson 7001, New Zealand;3. Auburn University Harrison School of Pharmacy, Department of Phamacy Practice, 4201 Walker Building, Auburn University, AL, 36849, USA;1. Department of Agricultural and Environmental Sciences (DiSAA), Universitá degli Studi di Milano, 20133 Milan, Italy;2. Centro Ricerche sul Riso, Ente Nazionale Risi (ENR), 27030, Castello d’Agogna (PV), Italy;1. Agricultural Engineering Department, College of Food and Agriculture Sciences, King Saud University, PO Box 2460, Riyadh 11451, Saudi Arabia;2. Prince Sultan Research Institute, and Prince Sultan International Prize for Water (PSIPW) Research Chair, King Saud University, Saudi Arabia;3. Agricultural Engineering Research Institute (AEnRI), Agricultural Research Center, PO Box 256, Giza, Egypt |
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| Abstract: | A volume-balance technique utilizing irrigation advance and recession functions, numerical integration, and an optimization procedure was developed to determine infiltration parameters. The procedure is simple yet rational and accounts for spatial variability of soil characteristics. The required data are flow rate, the coefficients and exponents of the advance and recession functions, and inflow shut-off time. In a field experiment on a clay loam soil (typical of southern Alberta) at the Lethbridge Research Centre, infiltration rates estimated by this technique were similar and in close agreement with those measured with a ring infiltrometer. Except for two border strips, there were no significant mean differences between simulated (Is) and measured (Im) infiltration rates. In the two non-conforming border strips, field measured infiltration rates were higher than those simulated with the volume balance approach, most likely due mainly to spatial variability of soil characteristics and partly to lateral flow which occasionally occurs when measuring infiltration with a ring infiltrometer. |
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