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| Web URL(s): | https://acsess.onlinelibrary.wiley.com/doi/10.2136/sssaj2000.642450x
Last checked: 02/27/2024
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https://acsess.onlinelibrary.wiley.com/doi/epdf/10.2136/sssaj2000.642450x
Last checked: 02/27/2024
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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 stable water-repellent layer |
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| Article Series: | Unstable water flow in a layered soil, part 1 |
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| Source: | Soil Science Society of America Journal. Vol. 64, No. 2, March/April 2000, p. 450-455. |
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| Publishing Information: | Madison, WI: Soil Science Society of America |
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| # of Pages: | 6 |
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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; Soil water movement; Transport processes in soil systems; Sand
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| Abstract/Contents: | "The development of preferential water flow in a soil profile can cause accelerated movement of pollutants to the groundwater thus reducing groundwater quality. This study investigated the effects of a stable water-repellent soil layer on the development of unstable water flow in a homogenous profile. Stable water-repellent soil is defined as one whose degree of water repellency does not change with time after contact with water. The effects of water entry pressure (h^D[p), water-repellent layer depth (L) and depth of ponded water at the soil surface (hₒ) on the development of unstable flow were investigated using homogenous coarse sand packed into a specially built rectangular chamber. The hydraulic conductivity of the water repellent soil was also measured as a function of h^D[p and hₒ in a separate experiment using the constant head method. The hydraulic conductivity and the water content of the water repellent soil increased as hₒ/h^D[p increased. No water penetrated the water repellent layer for values of (hₒ + L)/h^D[p < 1, unstable flow developed for values between 1 and 1.5 and a stable front developed for values > 1.5. The conclusion is that stable flow occurred when the water flux through the water repellent layer exceeded the saturated hydraulic conductivity of the underlying wettable layer. The water flux through the water repellent layer was a function of the hydraulic conductivity of the water repellent layer which increased as hₒ/h^D[p increased." |
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| Language: | English |
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| References: | 28 |
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| Note: | Figures
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 stable water-repellent layer. Soil Sci. Soc. Am. J. 64(2):p. 450-455. |
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| Web URL(s):
https://acsess.onlinelibrary.wiley.com/doi/10.2136/sssaj2000.642450x
Last checked: 02/27/2024
Access conditions: Item is within a limited-access website
https://acsess.onlinelibrary.wiley.com/doi/epdf/10.2136/sssaj2000.642450x
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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