FN Archimer Export Format
PT J
TI Catastrophic overwash and rapid retreat of a gravel barrier spit during storm events (Sillon de Talbert, North Brittany, France)
BT 
AF Suanez, Serge
   Stéphan, Pierre
   Autret, Ronan
   Houron, Julien
   Floc’h, France
   David, Laurence
   Ammann, Jérôme
   Accensi, Mickael
   André, Gael
   Le Guyader, Damien
   Cancouët, Romain
AS 1:1;2:1;3:1,2;4:3;5:4;6:1;7:4;8:5;9:6;10:7;11:8;
FF 1:;2:;3:;4:;5:;6:;7:;8:PDG-ODE-LOPS-SIAM;9:;10:;11:;
C1 LETG UMR 6554 CNRS Université de Bretagne Occidentale, Institut Universitaire Européen de la Mer, rue Dumont d’Urville Plouzané, France
   Laboratoire de Dynamique et de Gestion Intégrée des Zones Côtières, Chaire de Recherche en Géoscience Côtière Université du Québec à Rimouski Rimouski, QC , Canada
   Réserve naturelle régionale du Sillon de Talbert, 48 Rue du Sillon de Talbert Pleubian, France
   Laboratoire Géosciences Océan, LGO UMR 6538 CNRS Université de Bretagne Occidentale, Institut Universitaire Européen de la Mer, rue Dumont d’Urville Plouzané, France
   Laboratoire d'Océanographie Physique et Spatiale, LOPS UMR 6523, Ifremer/CNRS/UBO/IRD, Z.I. Pointe du Diable, CS 10070 Plouzané, France
   Service Hydrographique et Océanographique de la Marine, 13 rue du Chatellier, CS 92803 Brest, France
   Geo4Seas Society, 3 Venelle de la Tour d’Auvergne Le Relecq‐Kerhuon , France
   EURO‐ARGO ERIC, Campus Ifremer, Technopole Brest Iroise, 1625 Route de Sainte‐Anne Plouzané ,France
C2 UBO, FRANCE
   UNIV QUEBEC (UQAR), CANADA
   RESERV NATUR REG SILLON TALBERT, FRANCE
   UBO, FRANCE
   IFREMER, FRANCE
   SHOM, FRANCE
   GEO4SEAS SOC, FRANCE
   EURO‐ARGO ERIC, FRANCE
SI BREST
SE PDG-ODE-LOPS-SIAM
UM LOPS
   GEO-OCEAN
IN WOS Ifremer UMR
   WOS Cotutelle UMR
   copubli-france
   copubli-univ-france
   copubli-int-hors-europe
IF 3.3
TC 3
UR https://archimer.ifremer.fr/doc/00755/86687/92134.pdf
LA English
DT Article
DE ;gravel barrier spit;model;overwash;spit retreat;storm
AB The morphodynamic functioning of the Sillon de Talbert gravel barrier spit is analyzed using a high-frequency survey carried out between September 2012 and December 2019. It is based on beach profile measurements along two transects, modeling offshore wave data (WW3), tide gauge records, and shallow waves and water levels recorded in the intertidal zone. A barrier retreat of –23 to –30 m over the 7-year survey (i.e., –3.3 to –4.3 m.y-1) is measured. This retreat is not related to long-term SLR (macroscale of 102 to 103 yr), but to mesoscale (100 to 102 yr) morphogenic events combining storm wave and high spring tide. Over 87% to 90% of the barrier retreat is due to three significant events (February 1-2, 2014, February 9, 2016, and January 3, 2018). The storm impact scale model of Orford and Carter (1982) is tested. The estimation of the wave runup for the calculation of extreme water levels (i.e., peak overflow elevation (Oe) component), is based on the calibration of an equation performed from in situ measurements of the swash elevation. The flow depth (Od,q) overtopping the crest of the barrier (Bh) is thresholded by taking into account the morphological response of the barrier in order to define regimes corresponding to overtopping, discrete overwash, and sluicing overwash. While the Orford and Carter model is generally successful in reproducing the morphodynamic evolution of the Sillon de Talbert, the wave energy flux (F) must be considered as an additional parameter in order to improve the fit of the model, so far as it contributes in some cases to change the morphodynamic regime. Thus, the wave energy flux constitutes a key component in the quantification of the water flow across the barrier (Od,q) corresponding to the hydrodynamic forcing of the model, which becomes (Od,F). 
PY 2022
PD JUL
SO Earth Surface Processes And Landforms
SN 0197-9337
PU Wiley
VL 47
IS 8
UT 000774621300001
BP 2024
EP 2043
DI 10.1002/esp.5361
ID 86687
ER

EF