FN Archimer Export Format
PT J
TI Knickpoints and crescentic bedform interactions in submarine channels
BT 
AF CHEN, Ye
   PARSONS, Daniel R.
   SIMMONS, Stephen M.
   WILLIAMS, Rebecca
   CARTIGNY, Matthieu J. B.
   CLARKE, John E. Hughes
   STACEY, Cooper D.
   HAGE, Sophie
   TALLING, Peter J.
   AZPIROZ-ZABALA, Maria
   CLARE, Michael A.
   HIZZETT, Jamie L.
   HEIJNEN, Maarten S.
   HUNT, James E.
   LINTERN, D. Gwyn
   SUMNER, Esther J.
   VELLINGA, Age J.
   VENDETTUOLI, Daniela
AS 1:1,2;2:1;3:1;4:2;5:3,4;6:5;7:6;8:7,8;9:3,4;10:7,9;11:7;12:7,10;13:7,10;14:7;15:6;16:10;17:7,10;18:7,10;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;13:;14:;15:;16:;17:;18:;
C1 Univ Hull, Energy & Environm Inst, Kingston Upon Hull HU6 7RX, N Humberside, England.
   Univ Hull, Dept Geog Geol & Environm, Kingston Upon Hull HU6 7RX, N Humberside, England.
   Univ Durham, Dept Earth Sci, Stockton Rd, Durham DH1 3LE, England.
   Univ Durham, Dept Geog, Stockton Rd, Durham DH1 3LE, England.
   Univ New Hmapshire, Ctr Coastal & Ocean Mapping, Durham, NH 03824 USA.
   Geol Survey Canada, Nat Resource Canada, Sidney, BC V8L 4B2, Canada.
   Natl Oceanog Ctr, Ocean Biogeosci, Southampton SO14 3ZH, Hants, England.
   Univ Calgary, Dept Geosci, Calgary, AB T2N 1N4, Canada.
   Delft Univ Technol, Fac Civil Engn & Geosci, Delft, Netherlands.
   Univ Southampton, Sch Ocean & Earth Sci, Southampton SO14 3ZH, Hants, England.
C2 UNIV HULL, UK
   UNIV HULL, UK
   UNIV DURHAM, UK
   UNIV DURHAM, UK
   UNIV NEW HMAPSHIRE, USA
   GEOL SURVEY CANADA, CANADA
   NOC, UK
   UNIV CALGARY, CANADA
   UNIV DELFT, NETHERLANDS
   UNIV SOUTHAMPTON, UK
IF 3.81
TC 9
UR https://archimer.ifremer.fr/doc/00730/84232/97778.pdf
LA English
DT Article
DE ;Crescentic bedforms;knickpoints;sedimentary records;submarine channels;turbidity currents
AB Submarine channels deliver globally important volumes of sediments, nutrients, contaminants and organic carbon into the deep sea. Knickpoints are significant topographic features found within numerous submarine channels, which most likely play an important role in channel evolution and the behaviour of the submarine sediment-laden flows (turbidity currents) that traverse them. Although prior research has linked supercritical turbidity currents to the formation of both knickpoints and smaller crescentic bedforms, the relationship between flows and the dynamics of these seafloor features remains poorly constrained at field-scale. This study investigates the distribution, variation and interaction of knickpoints and crescentic bedforms along the 44 km long submarine channel system in Bute Inlet, British Columbia. Wavelet analyses on a series of repeated bathymetric surveys reveal that the floor of the submarine channel is composed of a series of knickpoints that have superimposed, higher-frequency, crescentic bedforms. Individual knickpoints are separated by hundreds to thousands of metres, with the smaller superimposed crescentic bedforms varying in wavelengths from ca 16 m to ca 128 m through the channel system. Knickpoint migration is driven by the passage of frequent turbidity currents, and acts to redistribute and reorganize the crescentic bedforms. Direct measurements of turbidity currents indicate the seafloor reorganization caused by knickpoint migration can modify the flow field and, in turn, control the location and morphometry of crescentic bedforms. A transect of sediment cores obtained across one of the knickpoints show sand-mud laminations of deposits with higher aggradation rates in regions just downstream of the knickpoint. The interactions between flows, knickpoints and bedforms that are documented here are important because they likely dominate the character of preserved submarine channel-bed deposits. 
PY 2021
PD JUL
SO Sedimentology
SN 0037-0746
PU Wiley
VL 68
IS 4
UT 000653326100004
BP 1358
EP 1377
DI 10.1111/sed.12886
ID 84232
ER

EF