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	Numerical Evaluation of Depth Effects of Double-Ring infiltrometers on Soil Saturated Hydraulic Conductivity Measurements
	Luo Y.
	2012
关键词	steady-state infiltration spatial variability measurement scale drip irrigation water simulations hydrus-2d field
英文摘要	Previous research has indicated that the measurements of soil saturated hydraulic conductivity (K-s) are influenced by both the radial size and depth of a double-ring infiltrometer. Few studies are available, however, on how the depth to which an infiltrometer is driven affects K-s measurement. In this study, six inner ring depths (d(i) = 5, 10, 15, 25, 40, and 60 cm), six outer ring depths (d(o) = 5, 10, 15, 25, 40, and 60 cm), and their combinations were designed. Thus 24 sets of driven depths of infiltrometer were involved. For each infiltrometer set, 31 stochastic fields of K-s were randomly generated in the simulation domain by adopting six correlation lengths (L = 0, 10, 20, 50, 100, and 200 cm) and six standard deviations (SD = 0, 0.1, 0.25, 0.5, 0.75, and 1.0). Therefore, a total of 7224 simulations were conducted to investigate the driven-depth effect of the double-ring infiltrometer on the measurements of soil saturated hydraulic conductivity of the wetted zone (K-w). Results demonstrated that the inner ring depth plays a more important role than the outer ring depth in K-w measurements by double-ring infiltrometer, and increasing the inner ring depth could obtain a better approximation of accurate K-w measurements. Meanwhile, the outer ring added to a single-ring infiltrometer was necessary in guaranteeing vertical water flow in the inner ring and improving measurement accuracy. Considering that the disturbance of soil caused by ring installation will increase with increasing ring depth, the ring depth of 5 to 15 cm that has been adopted in most ring-infiltrometer-related field experiments is acceptable and recommended for K-w measurements.
出处	Soil Science Society of America Journal
卷	76
期	3
页	867-875
收录类别	SCI
语种	英语
ISSN号	0361-5995
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/26885]
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	Luo Y.. Numerical Evaluation of Depth Effects of Double-Ring infiltrometers on Soil Saturated Hydraulic Conductivity Measurements. 2012.

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