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

A general model for the helical structure of geophysical flows in channel bends
A general model for the helical structure of geophysical flows in channel bends
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 10 flows lasted for 1–10 days, were up to ~80 m thick, and displayed a consistent helical structure. This structure comprised two vertically stacked cells, with the bottom cell rotating in 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.
0094-8276
11,932–11,941
Azpiroz, Maria
3b207eec-af03-4f88-99f8-3e8d2e8a49f6
Cartigny, M.J.B.
d252d7b1-16c6-47b1-bf86-8087070934ce
Sumner, Esther
dbba4b92-89cc-45d9-888e-d0e87e5c10ac
Clare, M.A.
2b5fe9d9-a4fa-4c54-b7ed-337d15b1c4cf
Talling, Peter J.
cda7fee6-bdff-4987-b203-450d1ce01179
Parsons, D.R.
8bc551f4-ae49-48cd-8533-82a34e749d74
Cooper, C.
bf1da25b-a7e3-4938-8b45-6961f8faf735
Azpiroz, Maria
3b207eec-af03-4f88-99f8-3e8d2e8a49f6
Cartigny, M.J.B.
d252d7b1-16c6-47b1-bf86-8087070934ce
Sumner, Esther
dbba4b92-89cc-45d9-888e-d0e87e5c10ac
Clare, M.A.
2b5fe9d9-a4fa-4c54-b7ed-337d15b1c4cf
Talling, Peter J.
cda7fee6-bdff-4987-b203-450d1ce01179
Parsons, D.R.
8bc551f4-ae49-48cd-8533-82a34e749d74
Cooper, C.
bf1da25b-a7e3-4938-8b45-6961f8faf735

Azpiroz, Maria, Cartigny, M.J.B., Sumner, Esther, Clare, M.A., Talling, Peter J., Parsons, D.R. and Cooper, C. (2017) A general model for the helical structure of geophysical flows in channel bends. Geophysical Research Letters, 11,932–11,941. (doi:10.1002/2017GL075721).

Record type: Article

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 10 flows lasted for 1–10 days, were up to ~80 m thick, and displayed a consistent helical structure. This structure comprised two vertically stacked cells, with the bottom cell rotating in 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.

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More information

Accepted/In Press date: 21 November 2017
e-pub ahead of print date: 11 December 2017
Published date: 16 December 2017

Identifiers

Local EPrints ID: 417564
URI: https://eprints.soton.ac.uk/id/eprint/417564
ISSN: 0094-8276
PURE UUID: 987af390-89db-4126-9c14-048906b90a15

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Date deposited: 05 Feb 2018 17:30
Last modified: 06 Aug 2019 17:03

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