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- W2000985285 abstract "Many areas of the northern United States and southern Canada, and particularly the 4 million ha of unirrigated cropland of the Northwestern Wheat and Range Region in the United States, experience severe water erosion under thawing soil conditions. Modeling soil erosion in these areas is hampered by a lack of knowledge of the relation of soil properties and moisture conditions to hydraulic resistance of thawing soils. This study was conducted to determine hydraulic and erodibility parameters of frozen and thawed soil under controlled moisture tension. A tilting flume was designed and constructed to allow near-natural freezing and thawing of a soil mass and to apply shear stress from flowing water. Flow tests were conducted for 90 min under soil moisture tensions of 50, 150, and 450 mm. A linear relationship was found between detachment and applied shear stress at a given time and moisture tension. Critical shear stress values showed little change with time. Rill erodibility decreased with increased soil moisture tension but changed more rapidly during tests at 50- and 150-mm tension. At 50-mm tension, the time-average erodibility, 689 g N−1 min−1, was about the same, and the critical shear value, 1.53 N m−2, about 60% of that found in tests of a similar Palouse silt loam soil tested under 50-mm tension without freezing. This study adds to the body of knowledge that indicates that the transient nature of rill erodibility during soil freezing and thawing should be considered to improve the accuracy of continuous simulation erosion models for winter conditions." @default.
- W2000985285 created "2016-06-24" @default.
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- W2000985285 date "2010-07-01" @default.
- W2000985285 modified "2023-09-23" @default.
- W2000985285 title "Freeze-Thaw and Water Tension Effects on Soil Detachment" @default.
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- W2000985285 doi "https://doi.org/10.2136/sssaj2009.0360" @default.
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