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Local scour around structures and the phenomenology of turbulence

Published online by Cambridge University Press:  14 August 2015

Costantino Manes  and
Maurizio Brocchini
Costantino Manes*
Affiliation:
Faculty of Engineering and the Environment, University of Southampton, SouthamptonSO17 1BJ, UK
Maurizio Brocchini
Affiliation:
Dipartimento ICEA, Università Politecnica delle Marche, via Brecce Bianche 12, 60131 Ancona, Italy
*
†Email address for correspondence: c.manes@soton.ac.uk
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Abstract

The scaling of the scour depth of equilibrium at the base of a solid cylinder immersed within an erodible granular bed and impinged by a turbulent shear flow is investigated here, for the first time, by means of the phenomenological theory of turbulence. The proposed theory allows the derivation of a predictive formula that (i) includes all the relevant non-dimensional parameters controlling the process, and (ii) contrary to commonly employed empirical formulae, is free from scale issues. Theoretical predictions agree very well with experimental data, shed light on unresolved issues on the physics of the problem, and clarify the effects of various dimensionless parameters controlling the scouring process.

JFM classification

Waves/Free-surface Flows: Hydraulics Geophysical and Geological Flows: Sediment transport Turbulent Flows: Turbulence theory
Type
Papers
Information
Journal of Fluid Mechanics , Volume 779 , 25 September 2015 , pp. 309 - 324
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Copyright
© 2015 Cambridge University Press 

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