What question did this study set out to answer?

To evaluate how soil detachment rates relate to aggregate size, tensile strength, flow shear stress, and stream power in shallow flows on low slopes.

March 1, 1991Soil Science Society of America Journal

Soil Detachment by Shallow Flow at Low Slopes

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To evaluate how soil detachment rates relate to aggregate size, tensile strength, flow shear stress, and stream power in shallow flows on low slopes.
Measured soil detachment rates in a hydraulic flume across three aggregate size classes of two distinct soils.
Tested hydraulic conditions using flow depths ranging from 0.5 to 2.0 cm across bed slopes of 0.5 to 2%.
Characterized aggregates through wet aggregate stability and tensile strength tests, and analyzed detachment predictors using multiple linear regression.
Detachment rates increased with greater flow depth and bed slope, fitting logarithmic regression models incorporating depth, slope, and either mean weight diameter (R² = 0.94) or tensile strength (R² = 0.91).
Detachment rates showed no functional dependence on flow shear stress or flow stream power.
Aggregates in the largest size class detached at a faster rate than aggregates in the two smaller size classes.

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Implication

Flume experiment demonstrates increased detachment rates in structured soils under higher slope and depth, indicating hydraulic geometry outperforms shear stress models.

Cite This Study

Nearing et al. (1991) studied this question.

synapsesocial.com/papers/6a037a083d6355fe2288c99b https://doi.org/10.2136/sssaj1991.03615995005500020006x

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Implication

Flume experiment demonstrates increased detachment rates in structured soils under higher slope and depth, indicating hydraulic geometry outperforms shear stress models.

Soil Detachment by Shallow Flow at Low Slopes

Key Points

Discussion

Implication

Cite This Study

Soil Detachment by Shallow Flow at Low Slopes

Key Points

Discussion

Implication

Cite This Study

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