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| Web URL(s): | https://acsess.onlinelibrary.wiley.com/doi/10.2136/sssaj1999.03615995006300030002x
Last checked: 03/01/2024
Access conditions: Item is within a limited-access website
Notes: Abstract only
https://acsess.onlinelibrary.wiley.com/doi/epdf/10.2136/sssaj1999.03615995006300030002x
Last checked: 03/01/2024
Requires: PDF Reader
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 & Yates: U.S. Department of Agriculture-Agricultural Research Service, U.S. Salinity Laboratory, Riverside, California 92521; and Letey: Department of Soil and Environmental Sciences, University of California, Riverside, California 92521 |
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| Title: | Measurement of initial soil-water contact angle of water repellent soils |
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| Section: | Division S-1 - Soil Physics
Other records with the "Division S-1 - Soil Physics" Section
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| Source: | Soil Science Society of America Journal. Vol. 63, No. 3, May/June 1999, p. 433-436. |
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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: Hydrophobic soils; Measurement; Methodology; Mathematical equations
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| Abstract/Contents: | "Water repellent soils are common throughout the world. Water repellency significantly affects infiltration, evaporation, and other water-soil interactions. Various indices, such as the water-solid contact angle (θ), water drop penetration time (WDPT), and 90° surface tension (γ^D[N^D[D), have been proposed to characterize the degree of water repellency. The water repellency of many soils is not stable, but changes with time after contact with water. No method is available to measure the initial soil-water contact angle. The purpose of this study was to establish a technique to measure the initial soil-water contact angle. We combined previously published theoretical relationships to develop the equations cosθ = [(γ^D[N^D[D/γ^D[w)¹^D]/² - 1] and h^D]p = 2[(γ^D[wγ^D[N^D[D)¹^D]/² - γ^D[w]/rρg, where γ^D[w is the water surface tension, h^D[p is the breakthrough pressure head, r is the pore radius, ρ is the water density, and g is the gravitational constant. The validity of these relationships was established by treating two sand materials with octadecylamine or solvent extracts from peat moss to create various levels of water repellency. An instrument was developed to measure h^D[p. A linear relationship was found between h^D[p and γ¹^D]/²^D[N^D[D, as specified by the equation. The value of r was computed from the slope h^D[p vs. γⁱ^D]/²^D[N^D[D curve, and this r value was combined with h^D[p in the capillary rise equation to compute cosθ. Good agreement was found between measured and predicted relationships between cosθ and γ¹^D]/²^D[N^D[D. The major conclusion is that the value of θ can be determined by measuring γ^D[N^D[D, which is easily done in the field or laboratory." |
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| Language: | English |
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| References: | 15 |
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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. 1999. Measurement of initial soil-water contact angle of water repellent soils. Soil Sci. Soc. Am. J. 63(3):p. 433-436. |
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| Web URL(s):
https://acsess.onlinelibrary.wiley.com/doi/10.2136/sssaj1999.03615995006300030002x
Last checked: 03/01/2024
Access conditions: Item is within a limited-access website
Notes: Abstract only
https://acsess.onlinelibrary.wiley.com/doi/epdf/10.2136/sssaj1999.03615995006300030002x
Last checked: 03/01/2024
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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