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Submarine channel flow processes and deposits: a process-product perspective

Submarine channel flow processes and deposits: a process-product perspective
Submarine channel flow processes and deposits: a process-product perspective

Process-product studies have been central to the development of process sedimentology over the past few decades, with the ability to first measure flows, and then examine the resulting deposits, removing much of the ambiguity associated with previous interpretations. However, perhaps uniquely for large geomorphic systems on Earth, there are no field-scale process-product studies of submarine channels. In fact, there are remarkably few direct measurements even of the flow dynamics as a result of the difficulties of measuring these powerful, infrequent, and often inaccessible flows. Over the past decade, physical experimentation has provided the first process-product studies for model submarine channel systems, enabling us to link flow behaviour and sedimentation patterns. This has been supplemented by numerical simulations, particularly of submarine channel flow dynamics. Here for the first time, we synthesise these observations, in the context of our direct knowledge of submarine channels, to derive an overview of submarine channel flow dynamics, and process-orientated intra-channel architecture models for low and high latitude systems. In addition, we propose new models for the development and evolution of point bars and for inner bend sedimentary accumulations that can comprise point bars overlain by finer-grained oblique accretion deposits. The work reveals a rich range of flow behaviour and associated sedimentation patterns in submarine channels that are far more complex than in fluvial systems.
Submarine channel, Turbidity current, Gravity current, Point bar, Helical flow, Sedimentation
0169-555X
95-120
Peakall, J.
2351dbf6-2c4f-4250-bacf-fe1b69870f26
Sumner, E.J.
dbba4b92-89cc-45d9-888e-d0e87e5c10ac
Peakall, J.
2351dbf6-2c4f-4250-bacf-fe1b69870f26
Sumner, E.J.
dbba4b92-89cc-45d9-888e-d0e87e5c10ac

Peakall, J. and Sumner, E.J. (2015) Submarine channel flow processes and deposits: a process-product perspective. Geomorphology, 244, 95-120. (doi:10.1016/j.geomorph.2015.03.005).

Record type: Article

Abstract


Process-product studies have been central to the development of process sedimentology over the past few decades, with the ability to first measure flows, and then examine the resulting deposits, removing much of the ambiguity associated with previous interpretations. However, perhaps uniquely for large geomorphic systems on Earth, there are no field-scale process-product studies of submarine channels. In fact, there are remarkably few direct measurements even of the flow dynamics as a result of the difficulties of measuring these powerful, infrequent, and often inaccessible flows. Over the past decade, physical experimentation has provided the first process-product studies for model submarine channel systems, enabling us to link flow behaviour and sedimentation patterns. This has been supplemented by numerical simulations, particularly of submarine channel flow dynamics. Here for the first time, we synthesise these observations, in the context of our direct knowledge of submarine channels, to derive an overview of submarine channel flow dynamics, and process-orientated intra-channel architecture models for low and high latitude systems. In addition, we propose new models for the development and evolution of point bars and for inner bend sedimentary accumulations that can comprise point bars overlain by finer-grained oblique accretion deposits. The work reveals a rich range of flow behaviour and associated sedimentation patterns in submarine channels that are far more complex than in fluvial systems.

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More information

Published date: 1 September 2015
Keywords: Submarine channel, Turbidity current, Gravity current, Point bar, Helical flow, Sedimentation
Organisations: Ocean and Earth Science

Identifiers

Local EPrints ID: 378890
URI: http://eprints.soton.ac.uk/id/eprint/378890
ISSN: 0169-555X
PURE UUID: a6edc24b-e7be-45c3-a12e-b6af8f171a72

Catalogue record

Date deposited: 09 Jul 2015 10:57
Last modified: 08 Jan 2022 15:24

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Contributors

Author: J. Peakall
Author: E.J. Sumner

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