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The role of biophysical cohesion on subaqueous bed form size

Parsons, Daniel R.; Schindler, Robert J.; Hope, Julie A.; Malarkey, Jonathan; Baas, Jaco H.; Peakall, Jeffrey; Manning, Andrew J.; Ye, Leiping; Simmons, Steve; Paterson, David M.; Aspden, Rebecca J.; Bass, Sarah J.; Davies, Alan G.; Lichtman, Ian D.; Thorne, Peter D.. 2016 The role of biophysical cohesion on subaqueous bed form size. Geophysical Research Letters, 43 (4). 1566-1573. 10.1002/2016GL067667

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AGU Publisher statement: An edited version of this paper was published by AGU. © 2016 American Geophysical Union. Further reproduction or electronic distribution is not permitted doi:10.1002/2016GL067667
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Abstract/Summary

Biologically active, fine-grained sediment forms abundant sedimentary deposits on Earth's surface, and mixed mud-sand dominates many coasts, deltas, and estuaries. Our predictions of sediment transport and bed roughness in these environments presently rely on empirically based bed form predictors that are based exclusively on biologically inactive cohesionless silt, sand, and gravel. This approach underpins many paleoenvironmental reconstructions of sedimentary successions, which rely on analysis of cross-stratification and bounding surfaces produced by migrating bed forms. Here we present controlled laboratory experiments that identify and quantify the influence of physical and biological cohesion on equilibrium bed form morphology. The results show the profound influence of biological cohesion on bed form size and identify how cohesive bonding mechanisms in different sediment mixtures govern the relationships. The findings highlight that existing bed form predictors require reformulation for combined biophysical cohesive effects in order to improve morphodynamic model predictions and to enhance the interpretations of these environments in the geological record.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1002/2016GL067667
ISSN: 00948276
Additional Keywords: sediment; bed forms; cohesivity; roughness; biophysical
Date made live: 12 Jul 2016 10:39 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/513945

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