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- W2014103649 abstract "Estimates of characteristic times to approach steady state flow in multidimensional infiltration in the landscape depend on the magnitude and character of the capillary length scale λ c and the associated capillary time scale t c . Here we derive relationships between λ c and t c and readily measured field properties sorptivity S and hydraulic conductivity K or S at two supply heads. We explore the relations between λ c and t c and other macroscopic and microscopic length, potential, and time scales. In addition, we show that the microscopic characteristic length λ m associated with λ c gives physically plausible estimates of flow‐weighted mean pore dimensions. We contrast values of λ c , t c , and λ m for undisturbed field soils with those of repacked materials for water supply potentials close to zero. Large λ m for the undisturbed surface soils are attributed to preferential flow. Data from here and elsewhere reveal no apparent trend of λ c with soil texture, with most λ c of the order of 100 mm. We suggest that the characteristic size of devices used to determine hydraulic properties of field soils should be greater than or equal to λ c for representative measurements. The geometric mean time of approach to steady state flow when water is supplied at potentials near or greater than zero is found to be 1.7 hours. This value together with published results suggest that the time of approach to steady state flow from multidimensional cavities is of the order of 1 hour for many field situations." @default.
- W2014103649 created "2016-06-24" @default.
- W2014103649 creator A5075042650 @default.
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- W2014103649 date "1987-08-01" @default.
- W2014103649 modified "2023-09-30" @default.
- W2014103649 title "Macroscopic and microscopic capillary length and time scales from field infiltration" @default.
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- W2014103649 doi "https://doi.org/10.1029/wr023i008p01514" @default.
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