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Dynamics and Deposition of Sediment-Bearing Multi- Pulsed Flows and Geological Implication

Ho, Viet Luan; Dorrell, Robert M.; Keevil, Gareth M; Keevil, Gareth M.; Thomas, Robert E; Thomas, Robert E.; Burns, Alan D; Burns, Alan D.; Baas, Jaco H; Baas, Jaco H.; Mccaffrey, William D; McCaffrey, William D.

Authors

Viet Luan Ho

Gareth M Keevil

Gareth M. Keevil

Robert E Thomas

Dr Robert Thomas R.E.Thomas@hull.ac.uk
Senior Research Fellow in Geomorphology and Flood Risk

Alan D Burns

Alan D. Burns

Jaco H Baas

Jaco H. Baas

William D Mccaffrey

William D. McCaffrey



Abstract

Copyright © 2019, SEPM (Society for Sedimentary Geology) 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.

Journal Article Type Article
Publication Date Jan 1, 2019
Journal Journal of Sedimentary Research
Print ISSN 1527-1404
Publisher Society for Sedimentary Geology
Peer Reviewed Peer Reviewed
Volume 8
Issue 11
Pages 1127-1139
APA6 Citation McCaffrey, W. D., Baas, J. H., Burns, A. D., Thomas, R. E., Keevil, G. M., Ho, V. L., …Mccaffrey, W. D. (2019). Dynamics and Deposition of Sediment-Bearing Multi- Pulsed Flows and Geological Implication. Journal of Sedimentary Research, 8(11), 1127-1139. https://doi.org/10.2110/jsr.2019.62
DOI https://doi.org/10.2110/jsr.2019.62
Keywords Multi-pulsed turbidites; Pulsed turbidites; Multi-pulsed flows; Single-pulsed turbidites; Sediment-bearing flows

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©2019 University of Hull





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