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A new methodology for the quantitative visualization of coherent flow structures in alluvial channels using multibeam echo-sounding (MBES)

Best, Jim; Simmons, Steve; Simmons, Stephen; Parsons, Daniel; Best, J L; Oberg, Kevin; Czuba, Jonathan; Malzone, Chris

Authors

Jim Best

J L Best

Kevin Oberg

Jonathan Czuba

Chris Malzone

Abstract

In order to investigate the interactions between turbulence and suspended sediment transport in natural aqueous environments, we ideally require a technique that allows simultaneous measurement of fluid velocity and sediment concentration for the whole flow field. Here, we report on development of a methodology using the water column acoustic backscatter signal from a multibeam echo sounder to simultaneously quantify flow velocities and sediment concentrations. The application of this new technique is illustrated with reference to flow over the leeside of an alluvial sand dune, which allows, for the first time in a field study, quantitative visualization of large-scale, whole flow field, turbulent coherent flow structures associated with the dune leeside that are responsible for suspending bed sediment. This methodology holds great potential for use in a wide range of aqueous geophysical flows.

Publication Date 2010-03
Journal Geophysical research letters
Print ISSN 0094-8276
Publisher American Geophysical Union
Peer Reviewed Peer Reviewed
Volume 37
Issue 6
Article Number ARTN L06405
Institution Citation Best, J., Simmons, S., Parsons, D., Oberg, K., Czuba, J., & Malzone, C. (2010). A new methodology for the quantitative visualization of coherent flow structures in alluvial channels using multibeam echo-sounding (MBES). Geophysical research letters, 37(6), https://doi.org/10.1029/2009gl041852
DOI https://doi.org/10.1029/2009gl041852
Keywords REF 2014 submission, Turbulence structure, 2-dimensional dunes, Sediment transport, Bedload transport
Publisher URL http://onlinelibrary.wiley.com/doi/10.1029/2009GL041852/abstract;jsessionid=3C102412D1EAD1BFCEADAE73C2724647.f03t04
Additional Information Copy of article first published in Geophysical research letters, 2010, v.37, issue 6

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