Plunge Pool Erosion in Cohesive Soils at Two Dams in Kansas

by Baxter E. Vieux, USDA, Soil Conservation Service, Ness City, KS, USA,

Document Type: Proceeding Paper

Part of: Water for Resource Development


Results of a field study of two plunge pools scoured by horizontal pipe outlets discharging on cohesive channels are analyzed. Formulas for critical tractive shear stress based on plasticity index, vane shear strength, and unconfined compressive strength are compared. A formula based on unconfined compressive strength is used to predict the equilibrium scour length in a cohesive soil to within 5 percent of the length measured in the field.

Subject Headings: Scour | Compressive strength | Shear strength | Dams | Shear stress | Soil strength | Piping erosion | Soil analysis | Kansas | United States

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