| Cite this article: | 李建德,徐飞飞,王健,等.不同负压设置对微型盘式入渗仪测定结皮入渗性能的影响[J].灌溉排水学报,0,():-. |
| Lijiande,Xufeifei,Wangjian,et al.不同负压设置对微型盘式入渗仪测定结皮入渗性能的影响[J].灌溉排水学报,0,():-. |
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| Effects of different negative pressure settings on the infiltration performance of soil physical crusts measured by Mini Disc Infiltrometer |
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Lijiande1,2, Xufeifei1,2, Wangjian1,2, Wangkanghong3, Yangqinxia3, Xuedong3
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1.Northwest A&2.F University;3.Hancheng Soil and Water Conservation Workstation
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| Abstract: |
| 【Objective】To quantitatively describe the effect of negative pressure setting on the measurement of crust infiltration performance of Mini Disc Infiltrometer. 【Methods】Through artificial rainfall simulation, taking the soil physical crust on the loess slope as the research object, the Mini Disc Infiltrometer was used for infiltration test, and five negative pressure gradients (1-5cm) were set to quantify the influence of different negative pressure settings on the determination of infiltration index. AtAt the same time, compared with the results obtained by the fixed head method, the saturated hydraulic conductivity as the standard, the accuracy of the two calculation methods based on Wooding model and Philip model are analyzed and compared. 【Results】: The constant head method has repeatability and accuracy, The saturated hydraulic conductivity of structural crust is 74.00 cm/d and that of sedimentary crust is 12.00 cm/d ; The indexes of soil cumulative infiltration, steady infiltration rate, infiltration rate and hydraulic conductivity of two kinds of crust were measured by micro disc infiltration instrument. The measurement results decreased with the increase of negative pressure setting of the instrument; When micro-disk infiltration meter is used to calculate soil saturated hydraulic conductivity, the calculation method based on Philip model is more accurate, but the result is greatly affected by the setting of negative pressure. Through van Genuchten parameter optimization, the parameters are calibrated with reference to the saturated hydraulic conductivity obtained by the constant head method α And N, the structural crusts are 0.039 and 2.72 respectively, and the sedimentary crusts are 0.024 and 2.83 respectively. 【Conclusion】The influence of different negative pressure settings on the measurement results and the applicability of the given parameters of the instrument to the calculation of soil saturated hydraulic conductivity must be considered when using the Mini Disc Infiltrometer for infiltration test, so as to accurately describe the soil infiltration characteristics and provide a theoretical basis for soil erosion prediction. |
| Key words: Mini Disc Infiltrometer; Structural crusts; Sedimentary crust; Saturated hydraulic conductivity; van Genuchten parameter |
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