QQ客服 官方微博 反馈留言

	Testing steady-state analysis of single-ring and square pressure infiltrometer data
	Bagarello V.; Iovino, M.; Lai, J.
	2016
关键词	Saturated soil hydraulic conductivity Single-ring pressure infiltrometer Square infiltrometer Numerical simulation saturated hydraulic conductivity tension infiltrometer numerical-simulation spatial variability stony soils infiltration field flow equation permeameters
英文摘要	Testing 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.
出处	Geoderma
卷	261
页	101-109
收录类别	SCI
语种	英语
ISSN号	0016-7061
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/43373]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Bagarello V.,Iovino, M.,Lai, J.. Testing steady-state analysis of single-ring and square pressure infiltrometer data. 2016.

个性服务

查看访问统计

相关权益政策

暂无数据

收藏/分享

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。