Decadal-scale variation in dune erosion and accretion as the result of extreme water level impact on the Vougot beach (Brittany, France)
International audience A high-frequency survey of beach/dune profile on the high-energy macrotidal Vougot beach in North Brittany (France) has been undertaken since 2004. This monitoring is a part of the french monitoring service called SNO DYNALIT (Service National d'Observation des dynamiques...
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Format: | Conference Object |
Language: | English |
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HAL CCSD
2016
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Online Access: | https://hal.science/hal-01512292 |
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ftanrparis:oai:HAL:hal-01512292v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Portail HAL-ANR (Agence Nationale de la Recherche) |
op_collection_id |
ftanrparis |
language |
English |
topic |
storm dune erosion accretion runup extreme water level [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDE]Environmental Sciences |
spellingShingle |
storm dune erosion accretion runup extreme water level [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDE]Environmental Sciences Suanez, Serge, S. Blaise, Emmanuel Cancouët, Romain Floc'H, France Ardhuin, Fabrice Decadal-scale variation in dune erosion and accretion as the result of extreme water level impact on the Vougot beach (Brittany, France) |
topic_facet |
storm dune erosion accretion runup extreme water level [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDE]Environmental Sciences |
description |
International audience A high-frequency survey of beach/dune profile on the high-energy macrotidal Vougot beach in North Brittany (France) has been undertaken since 2004. This monitoring is a part of the french monitoring service called SNO DYNALIT (Service National d'Observation des dynamiques du littoral et du trait de côte « DYNALIT »). The survey of the dune dynamic has revealed significant morphological changes over the last decades. These changes are characterized by alternating phases of erosion and accretion, which have been compared with extreme water level calculation, defined as the sum of (i) astronomic tide; (ii) storm surge; and (iii) vertical wave runup. Therefore, an experimental study based on field measurements for runup parameterization was also conducted between 2008 and 2013. The approach was based on morphological (limit of swash elevation and beach slope tan-beta) and hydrodynamic (wave H m0 , T m0,-1 , and high tide water level – HTWL) field measurements in order to quantify in-situ environmental conditions and dimensional swash parameters for the best calibration of Battjes (1974) runup formula. A good correlation between this empirical equation (1.01H mo ξ o) and field runup measurements (R max) was obtained (R 2 85%). The goodness of fit given by the RMSE was about 0.29 m. Extreme water levels were then used to explain the phases of dune erosion/accretion processes. A good relationship was noticed between dune erosion and high water levels when the water levels exceeded the dune foot elevation during storm conditions. In contrast, when extreme water levels were below the height of the toe of the dune sediment budget increased, inducing foredune recovery. These erosion and accretion phases may be related to the North Atlantic Oscillation Index. |
author2 |
Littoral, Environnement, Télédétection, Géomatique UMR 6554 (LETG) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-Université d'Angers (UA)-École Pratique des Hautes Études (EPHE) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Brest (UBO)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut de Géographie et d'Aménagement Régional de l'Université de Nantes (IGARUN) Université de Nantes (UN)-Université de Nantes (UN) Domaines Océaniques (LDO) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Observatoire des Sciences de l'Univers-Institut d'écologie et environnement-Centre National de la Recherche Scientifique (CNRS) Laboratoire de physique des océans (LPO) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) EUCC-France - Réseau Européen ANR-10-CEPL-0001,COCORISCO,COnnaissance, COmpréhension et gestion des RIsques COtiers(2010) ANR-10-LABX-0019,LabexMER,LabexMER Marine Excellence Research: a changing ocean(2010) |
format |
Conference Object |
author |
Suanez, Serge, S. Blaise, Emmanuel Cancouët, Romain Floc'H, France Ardhuin, Fabrice |
author_facet |
Suanez, Serge, S. Blaise, Emmanuel Cancouët, Romain Floc'H, France Ardhuin, Fabrice |
author_sort |
Suanez, Serge, S. |
title |
Decadal-scale variation in dune erosion and accretion as the result of extreme water level impact on the Vougot beach (Brittany, France) |
title_short |
Decadal-scale variation in dune erosion and accretion as the result of extreme water level impact on the Vougot beach (Brittany, France) |
title_full |
Decadal-scale variation in dune erosion and accretion as the result of extreme water level impact on the Vougot beach (Brittany, France) |
title_fullStr |
Decadal-scale variation in dune erosion and accretion as the result of extreme water level impact on the Vougot beach (Brittany, France) |
title_full_unstemmed |
Decadal-scale variation in dune erosion and accretion as the result of extreme water level impact on the Vougot beach (Brittany, France) |
title_sort |
decadal-scale variation in dune erosion and accretion as the result of extreme water level impact on the vougot beach (brittany, france) |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://hal.science/hal-01512292 |
op_coverage |
Biarritz, France |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
Littoral 2016 13th conference of the traditional biennial international event of the Coastal & Marine Union https://hal.science/hal-01512292 Littoral 2016 13th conference of the traditional biennial international event of the Coastal & Marine Union, Oct 2016, Biarritz, France |
op_relation |
hal-01512292 https://hal.science/hal-01512292 |
op_rights |
http://creativecommons.org/licenses/by/ |
_version_ |
1799485451197743104 |
spelling |
ftanrparis:oai:HAL:hal-01512292v1 2024-05-19T07:45:25+00:00 Decadal-scale variation in dune erosion and accretion as the result of extreme water level impact on the Vougot beach (Brittany, France) Suanez, Serge, S. Blaise, Emmanuel Cancouët, Romain Floc'H, France Ardhuin, Fabrice Littoral, Environnement, Télédétection, Géomatique UMR 6554 (LETG) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-Université d'Angers (UA)-École Pratique des Hautes Études (EPHE) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Brest (UBO)-Université de Rennes 2 (UR2)-Centre National de la Recherche Scientifique (CNRS)-Institut de Géographie et d'Aménagement Régional de l'Université de Nantes (IGARUN) Université de Nantes (UN)-Université de Nantes (UN) Domaines Océaniques (LDO) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Observatoire des Sciences de l'Univers-Institut d'écologie et environnement-Centre National de la Recherche Scientifique (CNRS) Laboratoire de physique des océans (LPO) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) EUCC-France - Réseau Européen ANR-10-CEPL-0001,COCORISCO,COnnaissance, COmpréhension et gestion des RIsques COtiers(2010) ANR-10-LABX-0019,LabexMER,LabexMER Marine Excellence Research: a changing ocean(2010) Biarritz, France 2016-10-25 https://hal.science/hal-01512292 en eng HAL CCSD hal-01512292 https://hal.science/hal-01512292 http://creativecommons.org/licenses/by/ Littoral 2016 13th conference of the traditional biennial international event of the Coastal & Marine Union https://hal.science/hal-01512292 Littoral 2016 13th conference of the traditional biennial international event of the Coastal & Marine Union, Oct 2016, Biarritz, France storm dune erosion accretion runup extreme water level [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology [SDE]Environmental Sciences info:eu-repo/semantics/conferenceObject Conference poster 2016 ftanrparis 2024-04-23T03:20:05Z International audience A high-frequency survey of beach/dune profile on the high-energy macrotidal Vougot beach in North Brittany (France) has been undertaken since 2004. This monitoring is a part of the french monitoring service called SNO DYNALIT (Service National d'Observation des dynamiques du littoral et du trait de côte « DYNALIT »). The survey of the dune dynamic has revealed significant morphological changes over the last decades. These changes are characterized by alternating phases of erosion and accretion, which have been compared with extreme water level calculation, defined as the sum of (i) astronomic tide; (ii) storm surge; and (iii) vertical wave runup. Therefore, an experimental study based on field measurements for runup parameterization was also conducted between 2008 and 2013. The approach was based on morphological (limit of swash elevation and beach slope tan-beta) and hydrodynamic (wave H m0 , T m0,-1 , and high tide water level – HTWL) field measurements in order to quantify in-situ environmental conditions and dimensional swash parameters for the best calibration of Battjes (1974) runup formula. A good correlation between this empirical equation (1.01H mo ξ o) and field runup measurements (R max) was obtained (R 2 85%). The goodness of fit given by the RMSE was about 0.29 m. Extreme water levels were then used to explain the phases of dune erosion/accretion processes. A good relationship was noticed between dune erosion and high water levels when the water levels exceeded the dune foot elevation during storm conditions. In contrast, when extreme water levels were below the height of the toe of the dune sediment budget increased, inducing foredune recovery. These erosion and accretion phases may be related to the North Atlantic Oscillation Index. Conference Object North Atlantic North Atlantic oscillation Portail HAL-ANR (Agence Nationale de la Recherche) |