The inherent instability of leveed seafloor channels

Dorrell, Robert M.; Burns, Alan D.; McCaffrey, William D.

Abstract

©2015. American Geophysical Union. All Rights Reserved. New analytical models demonstrate that under aggradational flow conditions, seafloor channel-levee systems are inherently unstable; both channel area and stability necessarily decrease at long timescales. In time such systems must avulse purely through internal (autogenic) forcing. Although autogenic instabilities likely arise over long enough time for additional allogenic forcing to be expected, channel-levee sensitivity to variations in flow character depends on the prior degree of system evolution. Recalibrated modern Amazon Fan avulsion timings are consistent with this model, challenging accepted interpretations of avulsion triggering.

Citation

Dorrell, R. M., Burns, A. D., & McCaffrey, W. D. (2015). The inherent instability of leveed seafloor channels. Geophysical research letters, 42(10), 4023-4031. https://doi.org/10.1002/2015GL063809

• Journal Article Type: Article
• Acceptance Date: Apr 27, 2015
• Online Publication Date: May 2, 2015
• Publication Date: May 28, 2015
• Deposit Date: Mar 21, 2018
• Journal: Geophysical Research Letters
• Print ISSN: 0094-8276
• Electronic ISSN: 1944-8007
• Publisher: American Geophysical Union
• Peer Reviewed: Peer Reviewed
• Volume: 42
• Issue: 10
• Pages: 4023-4031
• DOI: https://doi.org/10.1002/2015GL063809
• Keywords: Submarine channel; Levee; Avulsion; Autogenic; Allogenic
• Public URL: https://hull-repository.worktribe.com/output/733492
• Publisher URL: https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2015GL063809