Predicting Interfacial Diffusion Coefficients for Fluxes across the Sediment-Water Interface
Publication: Journal of Hydraulic Engineering
Volume 133, Issue 3
Abstract
Calculations of interfacial diffusion coefficients are often based on tracer flux or penetration into permeable media or sediments. Based on previous investigations, a new empirical relationship for tracer-based interfacial diffusion coefficients is derived. This relationship is a powerful tool for estimating interfacial fluxes over a range of environmentally relevant conditions. Support for this relationship was found in experiments targeting the slip velocity at porous media–boundary layer interfaces. Slip measurements from flume experiments using flat permeable sediment beds and from previous studies using high permeability media were converted to interfacial diffusion coefficients based on the momentum flux needed to drive the observed interstitial flow. Slip-based estimates compared well with the tracer-based predictions over the entire range of flow-permeability conditions. This study presents a relationship for predicting fluxes across the sediment-water interface that is driven by permeability-scale processes. Predicted fluxes are comparable to those documented for other processes driving interfacial transport, such as bed topography and sediment transport.
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Acknowledgments
The writer thanks the Rinehart Coastal Research Center at the Woods Hole Oceanographic Institution and the Institute for Marine and Coastal Sciences at Rutgers University for use of both of their flume facilities. Jay Sisson and Char Fuller provided essential assistance during experimentation. John Trowbridge provided guidance and advice throughout the experiments and analysis of the data presented in this manuscript. Gary Taghon provided helpful discussions during the formulation of this analysis and Greg Characklis provided comments on the manuscript. Postdoctoral support was provided by the Institute for Marine and Coastal Sciences at Rutgers University.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 133 • Issue 3 • March 2007
Pages: 267 - 272
Copyright
© 2007 ASCE.
History
Received: Mar 11, 2005
Accepted: May 5, 2006
Published online: Mar 1, 2007
Published in print: Mar 2007
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