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Experimental effects of antecedent moisture and soil strength on rainwash erosion of two Luvisols, Ontario

Experimental effects of antecedent moisture and soil strength on rainwash erosion of two Luvisols, Ontario

Geoderma 37(1): 29-43

The effect of antecedent moisture on rainfall erosion was evaluated in a series of field experiments by applying artificial rainfall at 50 mm h (super -1) (0.189 J m (super -2) s (super -1) ), to two Gray-Brown Luvisols on plots of 7.8 m (super 2) . The measured soil loss is significantly related to antecedent moisture. Extrapolations from the data indicate that soil loss may differ by as much as 800 times if the full range of antecedent soil moisture is considered. For the Guelph silt loam, the maximum soil moisture effect was observed at 20 min after the beginning of simulated rainfall. Torsional shear strength of remoulded samples at field bulk density was determined by using a mechanized torvane. Field shear strength was then estimated on the basis of the shear strength-soil moisture relationship established in the laboratory. Because sharp changes in both soil shear strength and soil loss were observed around the "vane shear" liquid limit, we suggest that the influence of soil moisture is at least in part expressed via soil strength.--Journal abstract.

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Accession: 001364013

Download citation: RISBibTeXText

DOI: 10.1016/0016-7061(86)90041-8

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