[1]WEI Ning,WEI Xia,HUANG Chihua.Influence of Freeze-Thaw Effects on Soil Critical Shear Stress and Soil Rill Erodibility[J].Research of Soil and Water Conservation,2021,28(03):19-24.
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
28
Number of periods:
2021 03
Page number:
19-24
Column:
Public date:
2021-04-20
- Title:
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Influence of Freeze-Thaw Effects on Soil Critical Shear Stress and Soil Rill Erodibility
- Author(s):
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WEI Ning1, WEI Xia2,3, HUANG Chihua3
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(1.College of Science, Northwest A&F University, Yangling, Shaanxi 712100, China; 2.College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China; 3.Agronomy Department, Purdue University, USDA-ARS National Soil Erosion Research Laboratory, West Lafayette, IN 47907-2077, USA)
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- Keywords:
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effects of freeze-thaw; variable flow scouring; soil critical shear stress; soil erodibility
- CLC:
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S157
- DOI:
-
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- Abstract:
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In order to reveal the influence of freeze-thaw effects on soil erosion by water, effects of freeze-thaw on the variation of critical shear stress under the influence of effects of freeze-thaw were studied by alternately freezing-thawing tests and scouring tests. Three kinds of freeze-thaw cycles(1, 3 and 6), two kinds of soil moisture mass fractions(10% and 20%)and control test(CK)were involved. The results show that different experimental treatments have different impact degrees and different impact tendency on soil critical shear stress and soil erodibility; when test soil experiences one freeze-thaw cycle, soil critical shear stress and soil erodibilty show the increasing trend compared to the control experiment; when the freeze-thaw cycle continues to increase to 3 and 6, the soil critical shear stress and soil erodibility show the decreasing trend compared to the control experiment, and when freeze-thaw cycle is equal to 3, soil critical shear stress and soil erodibility were minimum; Soil moisture mass fraction has the significant effect on soil critical shear stress and soil erodibility; when freeze-thaw cycles are same, soil critical shear stress and soil erodibility under 10% soil moisture mass fraction are bigger than the corresponding values under 20% soil moisture mass fraction. These results can provide the support for soil erosion prediction in the context of freeze-thaw cycle.