Measuring Saturated Hydraulic Conductivity using a Generalized Solution for Single-Ring Infiltrometers
- L. Wu *a,
- L. Panb,
- J. Mitchellc and
- B. Sandend
- a Dep. of Environmental Sciences, Univ. of California, Riverside, CA 92521 USA
b Earth Sci. Div., Lawrence Berkeley National Lab., Univ. of California, Berkeley, CA 95720 USA
c Kearney Agri. Center, Univ. of California, Parlier, CA 93648 USA
d Univ. of California Coop. Ext., Kern County, Bakersfield, CA 93307 USA
Saturated hydraulic conductivity is a measure of the ability of a soil to transmit water and is one of the most important soil parameters. New single-ring infiltrometer methods that use a generalized solution to measure the field saturated hydraulic conductivity (K s) were developed and tested in this study. The K s values can be calculated either from the whole cumulative infiltration curve (Method 1) or from the steady-state part of the cumulative infiltration curve by using a correction factor (Method 2). Numerical evaluation showed that the K s values calculated from the simulated infiltration curves of representative soil textural types were in the range of 87 to 130% of the real K s values. Field infiltration tests were conducted on an Arlington fine sandy loam (coarse-loamy, mixed, thermic, Haplic Durixeralfs). The geometric means of the K s values calculated from the field-measured infiltration curves by Method 1 and Method 2 were not significantly different. The geometric mean of the K s calculated from the detached core samples, however, was about twice that of the K s calculated from the infiltration curves, which was consistent with earlier findings. Unlike the earlier approaches, Method 1 calculates K s values from the whole infiltration curve without assuming a fixed relationship between saturated hydraulic conductivity and matric flux potential ϕmPlease view the pdf by using the Full Text (PDF) link under 'View' to the left.
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