FN Archimer Export Format
PT J
TI Multi-temporal analysis of submarine sand dunes morphodynamics (Bay of Brest, Brittany, France): A marker of sediment pathways in a macrotidal environment open to sea swells
BT 
AF Belleney, Deborah
   Ehrhold, Axel
   Le Dantec, Nicolas
   LE ROY, Pascal
   Jouet, Gwenael
AS 1:1;2:2;3:3,4;4:3;5:2;
FF 1:PDG-REM-GM-LGS;2:PDG-REM-GEOOCEAN-ASTRE;3:;4:;5:PDG-REM-GEOOCEAN-ASTRE;
C1 Institut Universitaire Européen de la Mer, Geomer - UMR 6554 CNRS LETG, 29280, Plouzané, France
   IFREMER, Géosciences Marines, Centre de Brest, 29280, Plouzané, France
   Institut Universitaire Européen de la Mer, UMR 6538 Géosciences Océan, Technopôle Brest-Iroise, 29280, Plouzané, France
   Institut Universitaire Européen de la Mer, UMS 3113, Technopôle Brest-Iroise, 29280, Plouzané, France
C2 UBO, FRANCE
   IFREMER, FRANCE
   UBO, FRANCE
   UBO, FRANCE
SI BREST
SE PDG-REM-GM-LGS
   PDG-REM-GEOOCEAN-ASTRE
UM GEO-OCEAN
IN WOS Ifremer UMR
   WOS Cotutelle UMR
   copubli-france
   copubli-univ-france
IF 2.8
TC 1
UR https://archimer.ifremer.fr/doc/00773/88458/94120.pdf
LA English
DT Article
CR GEOBREST
DE ;Sand body evolution;Sediment transport;Coastal sediment budget;Hydro-geomorphological control
AB Sediment structures including submarine banks and dune fields are ubiquitous on tide-dominated continental inner shelves such as in the Iroise Sea. These are of current interest to human activities in several respects: they constitute an obstacle to navigation, they are dredged for beach nourishment or exploited for marine aggregates. In addition, the morphodynamic characterising of these sedimentary structures improves the knowledge of the sediment transfers that occur in coastal areas. This study documents a submarine sand dune field located along the northern flank of the Goulet channel connecting the Bay of Brest to the Iroise Sea and the Bay of Biscay. Subject to a macrotidal regime with strong currents, and to large waves during storm events, this sedimentary system features large dunes with very high migration rates. The analysis of six bathymetric datasets (from March 2013 to October 2019) allows specifying the morphodynamic characteristics of this small dune field about 3.5 km in length and 500 m in width. These dunes have heights on the order of 0.5 m–3.7 m with migration rates that can vary significantly within the range from 10 m/yr to 70 m/yr. The results highlight that the ebb tidal current and slope of the channel are the main factors controlling the evolution of these biogenic sandy structures migrating offshore (SW). Furthermore, seasonal variations in coastal hydrodynamics forcing, driven by tidal currents, appear to affect the temporal and spatial evolution of the dunes at this shorter time scale. This paper proposes a model of sediment transport patterns at the mouth of the bay of Brest according dune field characteristic, strong ebb current and residual tidal gyre. 
PY 2022
PD SEP
SO Estuarine Coastal And Shelf Science
SN 0272-7714
PU Elsevier BV
VL 274
UT 000813485800001
DI 10.1016/j.ecss.2022.107911
ID 88458
ER

EF