Accuracy of Saturated Soil Hydraulic Conductivity Estimated from Numerically Simulated Single-Ring Infiltrations

doi:10.2136/vzj2018.06.0122

	Accuracy of Saturated Soil Hydraulic Conductivity Estimated from Numerically Simulated Single-Ring Infiltrations
	Bagarello, Vincenzo 1; Iovino, Massimo 1; Lai, Jianbin 2,3
刊名	VADOSE ZONE JOURNAL
	2019-02-28
卷号	18 期号:1 页码:12
ISSN号	1539-1663
DOI	10.2136/vzj2018.06.0122
通讯作者	Lai, Jianbin(laijianbin@igsnrr.ac.cn)
英文摘要	The single-ring pressure infiltrometer (PI) method is widely used to determine saturated soil hydraulic conductivity, K-s, directly in the field. The original and still most common way to analyze the data makes use of the steady-state model developed by the Canadian School in the 90s and two (two-ponding-depth, TPD, approach) or more (multiple-ponding-depth, MPD, approach) depths of ponding. The so-called Wu method based on a generalized infiltration equation allows analysis of the transient infiltration data collected by establishing a single ponding depth of water on the infiltration surface. This investigation, making use of simulated infiltration runs for initially unsaturated sand to silty clay loam soils, showed that, with a run duration of practical interest (e.g., 2 h), the PI can be expected to yield more accurate estimates of K-s in coarse-textured soils than in fine-textured soils even if the transient method is used instead of the steady-state method. Performing a three-level experiment and analyzing the estimated steady-state infiltration rates with both the TPD and MPD approaches is a way to predict the reliability of the estimated K-s value. The K-s accuracy should be acceptable if the two approaches yield similar results. Otherwise, the MPD approach should be expected to yield more accurate K-s estimates than the TPD approach. The transient method does not solve the K-s inaccuracy problems in fine-textured soils because obtaining accurate K-s data requires that the portion of total infiltration varying linearly with time represent a high percentage of total infiltration, but this percentage is small in fine-textured soils when the run does not exceed a few hours. This investigation opens some new perspective on the use of infiltration data to make predictions on the expected reliability of the K-s calculations with reference to both steady-state and transient data analysis procedures.
资助项目	[SKHL1719]
WOS关键词	HEAD WELL PERMEAMETER ; PRESSURE INFILTROMETER ; SPATIAL VARIABILITY ; GENERALIZED SOLUTION ; FIELD MEASUREMENT ; IN-SITU ; WATER ; FLOW ; SORPTIVITY ; HILLSLOPE
WOS研究方向	Environmental Sciences & Ecology ; Agriculture ; Water Resources
语种	英语
出版者	SOIL SCI SOC AMER
WOS记录号	WOS:000460018300001
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/49263]
专题	中国科学院地理科学与资源研究所
通讯作者	Lai, Jianbin
作者单位	1.Univ Palermo, Dip Sci Agr Alimentari & Forestali, Viale Sci, I-90128 Palermo, Italy 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Yucheng Comprehens Expt Stn, Beijing 100101, Peoples R China 3.Sichuan Univ, State Key Lab Hydraul & Mt River Engn SKHL, Chengdu 610065, Sichuan, Peoples R China
推荐引用方式 GB/T 7714	Bagarello, Vincenzo,Iovino, Massimo,Lai, Jianbin. Accuracy of Saturated Soil Hydraulic Conductivity Estimated from Numerically Simulated Single-Ring Infiltrations[J]. VADOSE ZONE JOURNAL,2019,18(1):12.
APA	Bagarello, Vincenzo,Iovino, Massimo,&Lai, Jianbin.(2019).Accuracy of Saturated Soil Hydraulic Conductivity Estimated from Numerically Simulated Single-Ring Infiltrations.VADOSE ZONE JOURNAL,18(1),12.
MLA	Bagarello, Vincenzo,et al."Accuracy of Saturated Soil Hydraulic Conductivity Estimated from Numerically Simulated Single-Ring Infiltrations".VADOSE ZONE JOURNAL 18.1(2019):12.