| 引用本文: | 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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| 摘要: |
| 【目的】定量描述负压设置对微型盘式入渗仪测定结皮入渗性能的影响。【方法】通过人工模拟降雨，以黄土坡面土壤物理结皮为研究对象，采用微型盘式入渗仪进行入渗试验，设置5个负压梯度（1-5cm），量化不同负压设置对入渗指标测定的影响，同时与以定水头法得到的结果进行对比饱和导水率为标准，分析比较基于Wooding模型与Philip模型两种计算方法的准确度。【结果】：定水头法具有可重复性与准确性，得到结构结皮饱和导水率为74.00 cm/d，沉积结皮饱和导水率为12.00 cm/d；采用微型盘式入渗仪测定两类结皮的土壤累积入渗量、稳渗速率、吸渗率、导水率等指标，测定结果随仪器负压设置增大而减小；微型盘式入渗仪法测算土壤饱和导水率时，基于Philip模型的计算方法更为准确，但结果随负压设置影响较大，以定水头法得到的饱和导水率为参照，率定van Genuchten参数α与n，结构结皮分别为0.039与2.78，沉积结皮分别为0.024与2.83。【结论】采用微型盘式入渗仪进行入渗试验时必须考虑不同负压设置对测定结果的影响和仪器给定参数对土壤饱和导水率计算的适用性，以准确描述土壤入渗特性，为土壤侵蚀预报等提供理论依据。 |
| 关键词: 微型盘式入渗仪；结构结皮；沉积结皮；土壤饱和导水率；van Genuchten参数 |
| DOI： |
| 分类号:S152.7 |
| 基金项目:国家自然科学(坡耕地微地形水力连通性及入渗机理研究41771308) |
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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 |
