Scour of Cohesive Soil by Submerged Circular Turbulent Impinging Jets
Publication: Journal of Hydraulic Engineering
Volume 127, Issue 7
Abstract
This paper introduces a method for estimating the scour in cohesive soils produced by a submerged vertical circular turbulent impinging jet. Determining scour in cohesive soils is a complex problem, partly because the clay particles within the soil are held together by electrochemical forces that are not easily quantifiable. As well, erosion occurs in many forms, such as the removal of individual particles or as large chunks of soil. Results of a laboratory study of scour by a circular impinging jet of a cohesive soil, consisting of 40% clay, 53% silt, and 7% fine sand, are presented. Analysis based on the mechanics of the impinging jets shows that the dimensions of the scour hole at an equilibrium state of scour are a function of the momentum flux from the jet, the impingement height (for “large” impingement heights), the viscosity and density of the eroding fluid, and the critical shear stress of the soil. Mass erosion was the predominant type of erosion observed.
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Information & Authors
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Published In
Journal of Hydraulic Engineering
Volume 127 • Issue 7 • July 2001
Pages: 598 - 606
History
Received: Jun 20, 2000
Published online: Jul 1, 2001
Published in print: Jul 2001
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