FN Archimer Export Format
PT J
TI Fill, flush or shuffle: How is sediment carried through submarine channels to build lobes?
BT 
AF Heijnen, Maarten S.
   Clare, Michael A.
   Cartigny, Matthieu J.B.
   Talling, Peter J.
   HAGE, Sophie
   Pope, Ed L.
   Bailey, Lewis
   Sumner, Esther
   Gwyn Lintern, D.
   Stacey, Cooper
   Parsons, Daniel R.
   Simmons, Stephen M.
   Chen, Ye
   Hubbard, Stephen M.
   Eggenhuisen, Joris T.
   Kane, Ian
   Hughes Clarke, John E.
AS 1:1,2;2:1;3:3;4:3;5:4,10;6:3;7:2;8:2;9:5;10:5;11:6;12:6;13:6;14:4;15:7;16:8;17:9;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;13:;14:;15:;16:;17:;
C1 National Oceanography Centre Southampton, European Way, Southampton, SO14 3ZH, UK
   School of Ocean and Earth Sciences, University of Southampton, European Way, Southampton, SO14 3ZH, UK
   Departments of Earth Science and Geography, Durham University, Science Laboratories, South Road, Durham, DH1 3LE, UK
   Univ Brest, CNRS, Ifremer, Geo-Ocean, F-29280 Plouzané, France
   Natural Resources Canada, Geological Survey of Canada, 9860 W Saanich Road, V8L 4B2, Sidney, BC, Canada
   Energy and Environment Institute, University of Hull, HU6 7RX, UK
   Faculty of Geosciences, Utrecht University, Princetonlaan 8a, 3584 CB Utrecht, the Netherlands
   School of Earth and Environmental Sciences, University of Manchester, Manchester M13 9PL, UK
   Center for Coastal and Ocean Mapping, University of New Hampshire, 24 Colovos Road, Durham, NH 03824, USA
   Univ Brest, CNRS, Ifremer, Geo-Ocean, F-29280 Plouzané, France
C2 NOC, UK
   UNIV SOUTHAMPTON, UK
   UNIV DURHAM, UK
   IFREMER, FRANCE
   GEOL SURVEY CANADA, CANADA
   UNIV HULL, UK
   UNIV UTRECHT, NETHERLANDS
   UNIV MANCHESTER, UK
   UNIV NEW HAMPSHIRE, USA
   UBO, FRANCE
SI BREST
SE PDG-REM-GEOOCEAN-ASTRE
UM GEO-OCEAN
IN WOS Ifremer UMR
   WOS Cotutelle UMR
   copubli-france
   copubli-europe
   copubli-univ-france
   copubli-int-hors-europe
IF 5.3
TC 10
UR https://archimer.ifremer.fr/doc/00756/86845/92333.pdf
   https://archimer.ifremer.fr/doc/00756/86845/92334.docx
   https://archimer.ifremer.fr/doc/00756/86845/92335.xlsx
LA English
DT Article
DE ;submarine channel;turbidity current;flushing;source to sink;bypass;lobe
AB Submarine channels are the primary conduits for land-derived material, including organic carbon, pollutants, and nutrients, into the deep-sea. The flows (turbidity currents) that traverse these systems can pose hazards to seafloor infrastructure such as cables and pipelines. Here we use a novel combination of repeat seafloor surveys and turbidity current monitoring along a 50 km-long submarine channel in Bute Inlet, British Columbia, and discharge measurements from the main feeding river. These source-to-sink observations provide the most detailed information yet on magnitude-frequency-distance relationships for turbidity currents, and the spatial-temporal patterns of sediment transport within a submarine channel-lobe system. This analysis provides new insights into mass redistribution, and particle residence times in submarine channels, as well as where particles are eventually buried and how that is recorded in the deposits. We observe stepwise sediment transport down the channel, with turbidity currents becoming progressively less frequent with distance. Most flows dissipate and deposit within the proximal (< 11 km) part of the system, whilst longer run-out flows then pick up this sediment, ‘shuffling’ it further downstream along the channel. This shuffling occurs mainly through upstream migration of knickpoints, which can generate sediment bypass along the channel over timescales of 10–100 yrs. Infrequent large events flush the channel and ultimately transport sediment onto the lobe. These flushing events can occur without obvious triggers, and thus might be internally generated. We then present the first ever sediment budget analysis of an entire submarine channel system, which shows that the river input and lobe aggradation can approximately balance over decadal timescales. We conclude by discussing the implication of this sediment shuffling for seafloor geohazards and particle burial. 
PY 2022
PD APR
SO Earth And Planetary Science Letters
SN 0012-821X
PU Elsevier BV
VL 584
UT 000782175600009
DI 10.1016/j.epsl.2022.117481
ID 86845
ER

EF