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• W2615969074 abstract "Research Article| May 19, 2017 Sub-decadal submarine landslides are important drivers of deltaic sediment flux: Insights from the Mississippi River Delta Front Jeffrey Obelcz; Jeffrey Obelcz * 1Department of Oceanography and Coastal Sciences, Louisiana State University, Baton Rouge, Louisiana 70803, USA2Coastal Studies Institute, Louisiana State University, Baton Rouge, Louisiana 70803, USA *E-mail: jobelc1@lsu.edu Search for other works by this author on: GSW Google Scholar Kehui Xu; Kehui Xu 1Department of Oceanography and Coastal Sciences, Louisiana State University, Baton Rouge, Louisiana 70803, USA2Coastal Studies Institute, Louisiana State University, Baton Rouge, Louisiana 70803, USA Search for other works by this author on: GSW Google Scholar Ioannis Y. Georgiou; Ioannis Y. Georgiou 3Department of Earth and Environmental Sciences and Pontchartrain Institute for Environmental Sciences, University of New Orleans, New Orleans, Louisiana 70148, USA Search for other works by this author on: GSW Google Scholar Jillian Maloney; Jillian Maloney 4Department of Geological Sciences, San Diego State University, San Diego, California 92182, USA Search for other works by this author on: GSW Google Scholar Samuel J. Bentley; Samuel J. Bentley 2Coastal Studies Institute, Louisiana State University, Baton Rouge, Louisiana 70803, USA5Department of Geology and Geophysics, Louisiana State University, Baton Rouge, Louisiana 70803, USA Search for other works by this author on: GSW Google Scholar Michael D. Miner Michael D. Miner 6Bureau of Ocean Energy Management, U.S. Department of the Interior, New Orleans, Louisiana 70123, USA Search for other works by this author on: GSW Google Scholar Geology (2017) 45 (8): 703–706. https://doi.org/10.1130/G38688.1 Article history received: 15 Oct 2016 rev-recd: 04 Apr 2017 accepted: 13 Apr 2017 first online: 23 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Jeffrey Obelcz, Kehui Xu, Ioannis Y. Georgiou, Jillian Maloney, Samuel J. Bentley, Michael D. Miner; Sub-decadal submarine landslides are important drivers of deltaic sediment flux: Insights from the Mississippi River Delta Front. Geology 2017;; 45 (8): 703–706. doi: https://doi.org/10.1130/G38688.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Submarine mass failures triggered by energetic forcing events such as hurricanes and earthquakes are relatively well studied due to the potential for infrastructure damage and tsunami generation; such failures are common on heavily sedimented margins where underconsolidated deposits are preconditioned to fail. However, studies of seafloor sediment movement between large events remain scarce. Using repeat bathymetric surveys of the Mississippi River Delta Front (MRDF), we document substantial seafloor movement in absence of major hurricanes. About 1 m/yr of deepening was observed within preexisting failures, with downslope sediment transport on the order of 105 m3/yr. Outside failure features, seafloor depths remained stable or showed minor (<20 cm/yr) accretion. MRDF volumetric sediment flux during hurricane-driven mass failures is an order of magnitude greater than the annual flux during a quiescent interval. When normalized by time, however, sediment flux during the quiescent interval (5.5 × 105 m3/yr) was half that of hurricane-driven mass failures (1.1 × 106 m3/yr). These observations corroborate our wave modeling results, which infer that even waves of 1 yr recurrence interval can generate differential seafloor pressures sufficient to trigger submarine landslides; this does not exclude the possibility of river floods also being agents of failure. These findings indicate that sub-decadal submarine landslides are important to MRDF dynamics, comparable to the role of major hurricanes, and observation during seemingly quiescent periods is necessary to holistically assess sediment flux. The periodicity and prevalence of moderate-scale mass transport documented here corroborates similar recent studies offshore other deltas globally, indicating that highstand mass and time budgets of shelf to deep-sea sediment flux, in addition to organic carbon and bioreactive particles, may need to be revised. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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• W2615969074 title "Sub-decadal submarine landslides are important drivers of deltaic sediment flux: Insights from the Mississippi River Delta Front" @default.
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