Conference Proceedings

Shear stresses on beds with large roughness elements

V Etminan, M Conde-Frias, M Abdolahpour, M Ghisalberti, R Lowe

Proceedings of the 21st Australasian Fluid Mechanics Conference, AFMC 2018 | Published : 2018

Abstract

© 2018 Australasian Fluid Mechanics Society. All rights reserved. Large bed roughness such as vegetation, gravels, ripples, etc. alters many benthic processes including sediment transport which, in turn, significantly affects the bed stability, channel morphology. Models to predict the onset and rates of sediment transport in environmental systems are conventionally related to the bed shear stress. Several methods exist to estimate the shear stress on bare beds but none of them are strictly applicable to beds with large roughness, predominantly due to the large impact roughness can have on the near-bed mean and turbulent flow structure. Recently, a Linear Stress Model (LSM) has been proposed..

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