Numerical evaluation of depth effects of double-ring infi ltrometers on soil saturated hydraulic conductivity measurements

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	Numerical evaluation of depth effects of double-ring infi ltrometers on soil saturated hydraulic conductivity measurements
	Luo Yi; Lai Jianbin
	2012
关键词	Soil surveys Computer simulation Hydraulic conductivity Measurements Soils
英文摘要	Previous research has indicated that the measurements of soil saturated hydraulic conductivity (Ks) are infl uenced by both the radial size and depth of a double-ring infi ltrometer. Few studies are available, however, on how the depth to which an infi ltrometer is driven affects Ks measurement. In this study, six inner ring depths (di = 5, 10, 15, 25, 40, and 60 cm), six outer ring depths (do = 5, 10, 15, 25, 40, and 60 cm), and their combinations were designed. Thus 24 sets of driven depths of infi ltrometer were involved. For each infi ltrometer set, 31 stochastic fields of Ks 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 infi ltrometer on the measurements of soil saturated hydraulic conductivity of the wetted zone (Kw). Results demonstrated that the inner ring depth plays a more important role than the outer ring depth in Kw measurements by doublering infi ltrometer, and increasing the inner ring depth could obtain a better approximation of accurate Kw measurements. Meanwhile, the outer ring added to a single-ring infi ltrometer 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-infi ltrometer-related field experiments is acceptable and recommended for K w measurements. Soil Science Society of America.
出处	Soil Science Society of America Journal
卷	76 期:3 页:867-875
收录类别	EI
语种	英语
内容类型	EI期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/27627]
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 Yi,Lai Jianbin. Numerical evaluation of depth effects of double-ring infi ltrometers on soil saturated hydraulic conductivity measurements. 2012.