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Boundary-layer hydrodynamics and bedload sediment transport in oscillating water tunnels

Published online by Cambridge University Press:  01 November 2010

DAVID GONZALEZ-RODRIGUEZ  and
OLE SECHER MADSEN
DAVID GONZALEZ-RODRIGUEZ*
Affiliation:
Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
OLE SECHER MADSEN
Affiliation:
Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
*
†Present address: Institut Curie, UMR 168, 11–13 rue Pierre et Marie Curie, 75005 Paris, France. Email address for correspondence: davidgr@alum.mit.edu
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Abstract

Oscillating water tunnels are experimental facilities commonly used in coastal engineering research. They are intended to reproduce near-bed hydrodynamic and sediment transport phenomena at a realistic scale. In an oscillating water tunnel, a piston generates an oscillatory motion that propagates almost instantaneously to the whole tunnel; consequently, flow is uniform along the tunnel, unlike the propagating wave motion in the sea or in a wave flume. This results in subtle differences between the boundary-layer hydrodynamics of an oscillating water tunnel and of a propagating wave, which may have a significant effect in the resulting sediment transport. In this paper, we present a zeroth-order analytical model of the turbulent boundary-layer hydrodynamics in an oscillating water tunnel. By using a time-varying eddy viscosity and by accounting for the constraints arising from the tunnel's geometry, the model predicts the oscillating water tunnel hydrodynamics and yields analytical expressions to compute bed shear stresses for asymmetric and skewed waves, both in the absence or presence of an imposed current. These expressions are applied to successfully quantify bedload sediment transport in oscillating water tunnel experiments.

JFM classification

Geophysical and Geological Flows: Coastal engineering Geophysical and Geological Flows: Sediment transport Turbulent Flows: Turbulent boundary layers
Type
Papers
Information
Journal of Fluid Mechanics , Volume 667 , 25 January 2011 , pp. 48 - 84
Copyright
Copyright © Cambridge University Press 2010

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