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A general model for the helical structure of geophysical flows in channel bends.

Azpiroz-Zabala, M. and Cartigny, M.J.B. and Sumner, E.J. and Clare, M.A. and Talling, P.J. and Parsons, D.R. and Cooper, C. (2017) 'A general model for the helical structure of geophysical flows in channel bends.', Geophysical research letters., 44 (23). 11,932-11,941.

Abstract

Meandering channels formed by geophysical flows (e.g. rivers and seafloor turbidity currents) include the most extensive sediment transport systems on Earth. Previous measurements from rivers show how helical flow at meander bends plays a key role in sediment transport and deposition. Turbidity currents differ from rivers in both density and velocity profiles. These differences, and the lack of field measurements from turbidity currents, have led to multiple models for their helical flow around bends. Here we present the first measurements of helical flow in submarine turbidity currents. These ten flows lasted for 1-to-10 days, were up to ~80-metres thick, and displayed a consistent helical structure. This structure comprised two vertically-stacked cells, with the bottom cell rotating with the opposite direction to helical flow in rivers. Furthermore, we propose a general model that predicts the range of helical flow structures observed in rivers, estuaries and turbidity currents based on their density stratification.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1002/2017GL075721
Publisher statement:© 2017. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Date accepted:21 November 2017
Date deposited:08 December 2017
Date of first online publication:11 December 2017
Date first made open access:04 January 2018

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