Ho, VL, Dorrell, RM, Keevil, GM orcid.org/0000-0002-1607-8297 et al. (4 more authors) (2019) Dynamics and Deposition of Sediment-Bearing Multi- Pulsed Flows and Geological Implication. Journal of Sedimentary Research, 89 (11). pp. 1127-1139. ISSN 1527-1404
Abstract
Previous studies on dilute, multi-pulsed, subaqueous saline flows have demonstrated that pulses will inevitably advect forwards to merge with the flow front. On the assumption that pulse merging occurs in natural-scale turbidity currents, it was suggested that multi-pulsed turbidites that display vertical cycles of coarsening and fining would transition laterally to single-pulsed, normally graded turbidites beyond the point of pulse merging. In this study, experiments of dilute, single- and multi-pulsed sediment-bearing flows (turbidity currents) are conducted to test the linkages between downstream flow evolution and associated deposit structure. Experimental data confirm that pulse merging occurs in laboratory-scale turbidity currents. However, only a weak correspondence was seen between longitudinal variations in the internal flow dynamics and the vertical structure of deposits; multi-pulsed deposits were documented, but transitioned to single-pulsed deposits before the pulse merging point. This early transition is attributed to rapid sedimentation-related depletion of the coarser-grained suspended fraction in the laboratory setting, whose absence may have prevented the distal development of multi-pulsed deposits; this factor complicates estimation of the transition point in natural-scale turbidite systems.
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Copyright, Publisher and Additional Information: | This is protected by copyright. This is an author produced version of an article published in Journal of Sedimentary Research. Uploaded in accordance with the publisher's self-archiving policy. | ||||
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Institution: | The University of Leeds | ||||
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Institute for Applied Geosciences (IAG) (Leeds) |
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Depositing User: | Symplectic Publications | ||||
Date Deposited: | 30 Aug 2019 09:09 | ||||
Last Modified: | 26 Nov 2020 01:39 | ||||
Status: | Published | ||||
Publisher: | Society for Sedimentary Geology | ||||
Identification Number: | https://doi.org/10.2110/jsr.2019.62 |