Testing steady-state analysis of single-ring and square pressure infiltrometer data
Bagarello, V; Iovino, M; Lai, J
2016
Source PublicationGEODERMA
ISSN0016-7061
Volume261Pages:101-109
AbstractTesting reliability of the saturated soil hydraulic conductivity, K-s, estimated by applying the steady-state single-ring (SR) model to the quasi steady-state infiltration rates obtained with a single-ring pressure infiltrometer (PI) increases confidence in the estimated K-s values. Determining a means to estimate K-s from infiltration data collected with a square infiltrometer allows the use of sources of different shapes. Using numerically simulated infiltration rates for six homogeneous soils ranging in texture from sand to silty clay loam, this investigation suggested an overall good performance of the SR model, with estimated K-s values differing by not more than 25% from the true values for the 90% of the 96 considered runs. Larger errors were generally obtained for the silty clay loam soil. Even in this case, however, a small ring radius (0.038 m), a relatively high initial soil water content (initial effective saturation = 0.4) and a relatively high depth of ponding (0.10 m) allowed the obtainment of accurate predictions of K-s (error = 13%) with a run of practically sustainable duration (4 h). The SR model was also usable to analyze quasi steady-state infiltration data collected with a square infiltrometer when infiltration was assumed to occur through a circular source having the same area of the square infiltrometer. With this assumption, the estimates of K-s differed from the true values by not more than a practically negligible 16%. The results of this investigation should help better interpret K-s values obtained with the PI and also improve the experimental methodology, depending on the soil. Moreover, a wider applicability of the infiltrometer techniques, i.e. not limited to a circular source, can be expected. Soil heterogeneity should be taken into account in the future since heterogeneity is common in the field. (C) 2015 Elsevier B.V. All rights reserved.
SubtypeJournal
KeywordSaturated soil hydraulic conductivity Single-ring pressure infiltrometer Square infiltrometer Numerical simulation
Subject AreaAgriculture
WOS Subject ExtendedSoil Science
WOS KeywordSATURATED HYDRAULIC CONDUCTIVITY ; TENSION INFILTROMETER ; NUMERICAL-SIMULATION ; SPATIAL VARIABILITY ; STONY SOILS ; INFILTRATION ; FIELD ; FLOW ; EQUATION ; PERMEAMETERS
Indexed BySCI
Language英语
WOS IDWOS:000362130900010
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/44328
Collection生态系统网络观测与模拟院重点实验室_生态网络实验室
Recommended Citation
GB/T 7714
Bagarello, V,Iovino, M,Lai, J. Testing steady-state analysis of single-ring and square pressure infiltrometer data[J]. GEODERMA,2016,261:101-109.
APA Bagarello, V,Iovino, M,&Lai, J.(2016).Testing steady-state analysis of single-ring and square pressure infiltrometer data.GEODERMA,261,101-109.
MLA Bagarello, V,et al."Testing steady-state analysis of single-ring and square pressure infiltrometer data".GEODERMA 261(2016):101-109.
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