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| Web URL(s): | https://acsess.onlinelibrary.wiley.com/doi/10.2136/sssaj2000.642456x
Last checked: 02/27/2024
Access conditions: Item is within a limited-access website
https://acsess.onlinelibrary.wiley.com/doi/epdf/10.2136/sssaj2000.642456x
Last checked: 02/27/2024
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Access conditions: Item is within a limited-access website |
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| Publication Type:
| Refereed |
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| Author(s): | Carrillo, M. L. K.;
Letey, J.;
Yates, S. R. |
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| Author Affiliation: | Carrillo and Letey: Department of Soil and Environmental Sciences, University of California, Riverside, CA; and Yates: USDA-ARS, Soil Physics and Pesticides Research Unit, U.S. Salinity Laboratory, Riverside, CA |
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| Title: | Unstable water flow in a layered soil: I. Effects of a unstable water-repellent layer |
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| Article Series: | Unstable water flow in a layered soil, part 2 |
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| Source: | Soil Science Society of America Journal. Vol. 64, No. 2, March/April 2000, p. 456-459. |
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| Publishing Information: | Madison, WI: Soil Science Society of America |
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| # of Pages: | 4 |
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| Keywords: | TIC Keywords: Preferential flow; Soil profiles; Groundwater contamination; Hydrophobic soils; Saturated hydraulic conductivity; Hydraulic conductivity; Infiltration; Water pressure; Soil water content; Penetration; Surface tension; Soil water movement
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| Abstract/Contents: | "Water repellent soils are found throughout the world and can exhibit significantly different water flow characteristics as compared to a wettable soil. The purpose of the study was to determine the significance of the stability of the water repellency on the development of unstable water flow below a water repellent layer. Unstable water-repellent soil refers to a soil whose degree of repellency changes with time after contact with water. Experiments were conducted in a specially built rectangular chamber where wetting front patterns could be observed through a Plexiglas sheet. The experiments were done on water repellent sand layers that were treated to create water drop penetration time (WPDT) values of 1, 10, and 150 min. The WDPT of the layer and the ratio (hₒ + L)/h^D[p were important in the development of fingers, where hₒ is the depth of the ponded water at the soil surface, L is the depth of the water repellent layer and h^D[p is the water entry pressure head of the water repellent layer. For low WPDT (1 min) no fingers formed. As the WPDT increased, the tendency for finger formation also increased. The medium WPDT (10 min) layer caused finger formation, however, the fingers broadened and converged after continued flow and an almost uniform wetting front eventually developed. The combination of a high WPDT (150 min) and (hₒ + L)/ h^D[p < 1 produced the most dramatic and persistent fingering. The finger development across the layer and the flux through the layer was found to be a function of time. Water repellency at the soil surface has the greatest impact on infiltration because water depth may not be sufficient to overcome the water entry pressure and runoff would decrease the time of exposure to water to overcome unstable water repellency." |
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| Language: | English |
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| References: | 7 |
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| Note: | Figures
Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Carrillo, M. L. K., J. Letey, and S. R. Yates. 2000. Unstable water flow in a layered soil: I. Effects of a unstable water-repellent layer. Soil Sci. Soc. Am. J. 64(2):p. 456-459. |
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| Web URL(s):
https://acsess.onlinelibrary.wiley.com/doi/10.2136/sssaj2000.642456x
Last checked: 02/27/2024
Access conditions: Item is within a limited-access website
https://acsess.onlinelibrary.wiley.com/doi/epdf/10.2136/sssaj2000.642456x
Last checked: 02/27/2024
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
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MSU catalog number: S 590 .S65 |
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