Non-hydrostatic modelling of extreme water levels on Banneg Island, France
International audience Extreme water level events were observed during recent winters on Banneg Island [Ardhuin et al., 2011; Suanez et al., 2009], a small island off western Brittany well exposed to the large North Atlantic swells and characterized by steep rocky cliffs on its western part. Based o...
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HAL CCSD
2015
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Online Access: | https://hal.science/hal-01216332 https://hal.science/hal-01216332/document https://hal.science/hal-01216332/file/Dodet_et_al_WHF2015.pdf |
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Normandie Université: HAL |
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ftnormandieuniv |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDE]Environmental Sciences [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDE]Environmental Sciences [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology Dodet, Guillaume Suanez, Serge, S. Leckler, Fabien Ardhuin, Fabrice Fichaut, Bernard Autret, Ronan Non-hydrostatic modelling of extreme water levels on Banneg Island, France |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDE]Environmental Sciences [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology |
description |
International audience Extreme water level events were observed during recent winters on Banneg Island [Ardhuin et al., 2011; Suanez et al., 2009], a small island off western Brittany well exposed to the large North Atlantic swells and characterized by steep rocky cliffs on its western part. Based on geomorphic evidences (bedrock scars, overturned boulders, debris lines) and hydrodynamic data, Fichaut and Suanez [2011] investigated the quarrying and transport of cliff-top storm deposits induced by giant wave events and partial flooding of the island (Fig.1), while Suanez et al. [2009] provided a retrospective analysis of extreme water levels based on a 30-year wave model hindcast and empirical run-up formula. Later, Sheremet et al. [2014] deployed pressure sensor measurements to this site and applied a 1D nonlinear mild-slope model to reveal that the highest water levels could exceed 6.5 m above the astronomical tide during major storms, mainly induced by large infragravity waves. In order to improve our understanding of the storm-induced hydrodynamics in the Iroise Sea, a wave buoy was deployed to the west of Banneg and additional pressure sensors were installed on the western part of the island (Section 2). In addition, a phase-resolving wave model based on the nonlinear shallow water equations, including non-hydrostatic pressure was applied to the study site and the model results were validated against in-situ observations (Section 3). The hydrodynamic data collected during the major storms of February 2014 were analyzed and the model was forced with the hydrodynamic conditions of the morning high tide of February 5, when some of the highest water levels were observed on the island (Section 4). Based on this combined model-data analysis, the incident and infragravity wave dynamics in the nearshore, and the associated sporadic flooding of the island were investigated in the light of previous studies on Banneg Island (Section 5). |
author2 |
Littoral, Environnement, Télédétection, Géomatique (LETG - Brest) 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)-Université de Caen Normandie (UNICAEN) Université de Nantes (UN)-Université de Nantes (UN) Service Hydrographique et Océanographique de la Marine (SHOM) Ministère de la défense (1936-.) 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) Projet PROTEVS (contrat de recherche 12CR6) financé par la Direction Générale des Armées et dirigé par le Service Hydrographique et Océanographique de la Marine Val SWAIL and Donald RESIO Joint Technical Commission for Oceanography and Marine Meteorology (JCOMM) ANR-10-LABX-0019,LabexMER,LabexMER Marine Excellence Research: a changing ocean(2010) |
format |
Conference Object |
author |
Dodet, Guillaume Suanez, Serge, S. Leckler, Fabien Ardhuin, Fabrice Fichaut, Bernard Autret, Ronan |
author_facet |
Dodet, Guillaume Suanez, Serge, S. Leckler, Fabien Ardhuin, Fabrice Fichaut, Bernard Autret, Ronan |
author_sort |
Dodet, Guillaume |
title |
Non-hydrostatic modelling of extreme water levels on Banneg Island, France |
title_short |
Non-hydrostatic modelling of extreme water levels on Banneg Island, France |
title_full |
Non-hydrostatic modelling of extreme water levels on Banneg Island, France |
title_fullStr |
Non-hydrostatic modelling of extreme water levels on Banneg Island, France |
title_full_unstemmed |
Non-hydrostatic modelling of extreme water levels on Banneg Island, France |
title_sort |
non-hydrostatic modelling of extreme water levels on banneg island, france |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://hal.science/hal-01216332 https://hal.science/hal-01216332/document https://hal.science/hal-01216332/file/Dodet_et_al_WHF2015.pdf |
op_coverage |
Key West, Florida, United States |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
14th International Workshop on Wave Hindcasting and Forecasting and 5th Coastal Hazard Symposium https://hal.science/hal-01216332 14th International Workshop on Wave Hindcasting and Forecasting and 5th Coastal Hazard Symposium, Val SWAIL and Donald RESIO, Nov 2015, Key West, Florida, United States http://www.jcomm.info/index.php?option=com_oe&task=viewEventRecord&eventID=1644 |
op_relation |
hal-01216332 https://hal.science/hal-01216332 https://hal.science/hal-01216332/document https://hal.science/hal-01216332/file/Dodet_et_al_WHF2015.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1802647905363820544 |
spelling |
ftnormandieuniv:oai:HAL:hal-01216332v1 2024-06-23T07:55:20+00:00 Non-hydrostatic modelling of extreme water levels on Banneg Island, France Dodet, Guillaume Suanez, Serge, S. Leckler, Fabien Ardhuin, Fabrice Fichaut, Bernard Autret, Ronan Littoral, Environnement, Télédétection, Géomatique (LETG - Brest) 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)-Université de Caen Normandie (UNICAEN) Université de Nantes (UN)-Université de Nantes (UN) Service Hydrographique et Océanographique de la Marine (SHOM) Ministère de la défense (1936-.) 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) Projet PROTEVS (contrat de recherche 12CR6) financé par la Direction Générale des Armées et dirigé par le Service Hydrographique et Océanographique de la Marine Val SWAIL and Donald RESIO Joint Technical Commission for Oceanography and Marine Meteorology (JCOMM) ANR-10-LABX-0019,LabexMER,LabexMER Marine Excellence Research: a changing ocean(2010) Key West, Florida, United States 2015-11-08 https://hal.science/hal-01216332 https://hal.science/hal-01216332/document https://hal.science/hal-01216332/file/Dodet_et_al_WHF2015.pdf en eng HAL CCSD hal-01216332 https://hal.science/hal-01216332 https://hal.science/hal-01216332/document https://hal.science/hal-01216332/file/Dodet_et_al_WHF2015.pdf info:eu-repo/semantics/OpenAccess 14th International Workshop on Wave Hindcasting and Forecasting and 5th Coastal Hazard Symposium https://hal.science/hal-01216332 14th International Workshop on Wave Hindcasting and Forecasting and 5th Coastal Hazard Symposium, Val SWAIL and Donald RESIO, Nov 2015, Key West, Florida, United States http://www.jcomm.info/index.php?option=com_oe&task=viewEventRecord&eventID=1644 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDE]Environmental Sciences [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology info:eu-repo/semantics/conferenceObject Conference papers 2015 ftnormandieuniv 2024-06-11T00:01:58Z International audience Extreme water level events were observed during recent winters on Banneg Island [Ardhuin et al., 2011; Suanez et al., 2009], a small island off western Brittany well exposed to the large North Atlantic swells and characterized by steep rocky cliffs on its western part. Based on geomorphic evidences (bedrock scars, overturned boulders, debris lines) and hydrodynamic data, Fichaut and Suanez [2011] investigated the quarrying and transport of cliff-top storm deposits induced by giant wave events and partial flooding of the island (Fig.1), while Suanez et al. [2009] provided a retrospective analysis of extreme water levels based on a 30-year wave model hindcast and empirical run-up formula. Later, Sheremet et al. [2014] deployed pressure sensor measurements to this site and applied a 1D nonlinear mild-slope model to reveal that the highest water levels could exceed 6.5 m above the astronomical tide during major storms, mainly induced by large infragravity waves. In order to improve our understanding of the storm-induced hydrodynamics in the Iroise Sea, a wave buoy was deployed to the west of Banneg and additional pressure sensors were installed on the western part of the island (Section 2). In addition, a phase-resolving wave model based on the nonlinear shallow water equations, including non-hydrostatic pressure was applied to the study site and the model results were validated against in-situ observations (Section 3). The hydrodynamic data collected during the major storms of February 2014 were analyzed and the model was forced with the hydrodynamic conditions of the morning high tide of February 5, when some of the highest water levels were observed on the island (Section 4). Based on this combined model-data analysis, the incident and infragravity wave dynamics in the nearshore, and the associated sporadic flooding of the island were investigated in the light of previous studies on Banneg Island (Section 5). Conference Object North Atlantic Normandie Université: HAL |