Case studies of extreme paleoevents along the French Atlantic coast

• Main Author: Pouzet, Pierre
• Other Authors: 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), Observatoire des Sciences de l'Univers de Nantes Atlantique (OSUNA)Axe 3 (Histoire des Risques) de l'Observatoire Régional des Risques Côtiers (OR2C) en Pays de la Loire, Fondation de France, Laboratoire Littoral, Environnement, Télédétection, Géomatique (LETG), Bourse de l'ex école doctorale DEGEST (Droit, Economie-Gestion, Environnement, Sociétés et Territoires), Université de Nantes, Marc Robin, Mohamed Maanan
• Format: Doctoral or Postdoctoral Thesis
• Language: French
• Published: HAL CCSD 2018
• Subjects: Coastal hazards; French Atlantic coast; Sedimentology; Dendrochronology; Historical archives; Risques côtiers; Côte atlantique française; Sédimentologie; Dendrochronologie; Archives historiques; [SHS.GEO]Humanities and Social Sciences/Geography; [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology; [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy; [SDE.MCG]Environmental Sciences/Global Changes; [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces; environment; North Atlantic; North Atlantic oscillation
• Online Access: https://theses.hal.science/tel-02197163; https://theses.hal.science/tel-02197163/document; https://theses.hal.science/tel-02197163/file/These_Pouzet_Pierre_LQ.pdf

Ce fichier est une version de la thèse présentant une qualité réduite pour permettre l'import sur les plateformes en ligne. La version haute qualité (980Mo) est disponible en cliquant sur le lien suivant : https://www.dropbox.com/s/nw077vgk32yasjd/These_Pouzet_Pierre_HQ.zip?dl=0This file is a version of the thesis with a reduced quality to allow import on online platforms. The high-quality version (980MB) is available by clicking on the following link: https://www.dropbox.com/s/nw077vgk32yasjd/These_Pouzet_Pierre_HQ.zip?dl=0 This study aims to develop several methodological approaches to rebuild past extreme events at the Holocene, millennial and Anthropocene timescales. The methodology is based on a multidisciplinary approach using sedimentology, dendrochronology, climatology and climate history. These approaches were applied to three study sites: the island of Yeu, the Traicts du Croisic and the Petite mer de Gâvres.Several ancient extreme events have been identified and correlated to one another thanks to the multidisciplinary approach. At the Holocene scale, periods of strong stormy impacts seem to be bound to the North Atlantic cooling phases: 600-300, 1700-1100, 2900-2500, 3500-3300, 5500-5100 and 7700-7100 cal y BP. At the millennial scale, however, the connections between the climate change of the Little Ice Age and the North Atlantic Oscillation are more difficult to comprehend. The coupling of sedimentological data with historical archives characterizes sixteen extreme events with high environmental and societal impacts. One of these events, which occurred during the winter of 1351-1352 (n.st) AD, has been qualified as a « Millennium event ». At the Antropocene scale, the sedimentological analysis brings to light four major dates: 1990, 1972, 1940 and 1896 AD. The dendrochronological analysis proved there have been nineteen stormy winters since 1955 AD, which have been confirmed by meteorological archives and reanalysis data. These different approaches enable us to increase with more accuracy our ...