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| Effects of initial soil water content and rainfall intensity on Loess infiltration capacity |
| Liu Han1,Lei Tingwu1,2,Zhao Jun2 |
| 1.Key Laboratory of Modern Precision Agriculture System Integration Research,College of Water Conservancy and Civil Engineering,China Agricultural University,100083,Beijing;2.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Institute of Soil and Water Conservation,CAS & MWR,712100,Yangling,Shaanxi: China |
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Abstract The Run-off-on-out(ROOO) method was used to measure soil infiltrability in order to research the effects of rainfall intensity and soil water content on soil infiltrability compared with Double Ring(DR) method.The experiments involved 3 soil moisture contents(2.6%,10.4% and 19.5%) and 3 rainfall intensities (20,40 and 60 mm/h).Soil infiltrability measured by the ROOO method decreased with higher initial soil water content and rainfall intensity.However,the initial soil infiltrability obtained by DR method increased with higher soil water content,as well as the stable infiltrability decreased with higher soil water content.The soil infiltrability processes measured with the ROOO method give better fittings with Kostiakov,Horton and Philip infiltration models,than those measured with double-ring infiltrometer.Moreover,the Horton infiltration model gives the best fitting results comparing with other models.
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Received: 30 June 2008
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