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Shear flow and viscosity in single-layer hydraulics

Published online by Cambridge University Press:  01 February 2006

ANDREW McC HOGG
Affiliation:
Research School of Earth Sciences, The Australian National University, Canberra, ACT, 0200, Australia
GRAHAM O. HUGHES
Affiliation:
Research School of Earth Sciences, The Australian National University, Canberra, ACT, 0200, Australia

Abstract

We calculate solutions for one-layer hydraulically controlled flows with viscosity. Viscosity and bottom drag produce two key modifications to inviscid hydraulic theory: the position of the hydraulic control point is altered, and the solution requires knowledge of the velocity profile over the entire domain. Hence, analytically tractable solutions are not generally possible and a numerical technique is developed to calculate such flows.

In this paper, bottom drag and fluid viscosity are treated as independent parameters, allowing the influence of each parameter on flux, flow dissipation and position of hydraulic control to be quantified. We find that the flow is determined primarily by the bottom drag, and, surprisingly, the largest perturbation from this state occurs for intermediate values of fluid viscosity.

Type
Papers
Copyright
© 2006 Cambridge University Press

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