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Title

Frequency and intensity of high-altitude floods over the last 3.5 ka in northwestern French Alps (Lake Anterne)

Publication Year

2012

Author(s)
  • Giguet-Covex, Charline
  • Arnaud, Fabien
  • Enters, Dirk
  • Poulenard, Jerome
  • Millet, Laurent
  • Francus, Pierre
  • David, Fernand
  • Rey, Pierre-Jerome
  • Wilhelm, Bruno
  • Delannoy, Jean-Jacques
Source
QUATERNARY RESEARCH Volume: 77 Issue: 1 Pages: 12-22 Published: 2012
ISSN
0033-5894
Abstract

In central Western Europe, several studies have shown that colder Holocene periods, such as the Little Ice Age, also correspond to wet periods. However, in mountain areas which are highly sensitive to erosion processes and where precipitation events can be localized, past evolution of hydrological activity might be more complicated. To assess these past hydrological changes, a paleolimnological approach was applied on a 13.4-m-long sediment core taken in alpine Lake Anterne (2063 m asl) and representing the last 3.5 ka. Lake sedimentation is mainly composed of flood deposits triggered by precipitation events. Sedimentological and geochemical analyses show that floods were more frequent during cold periods while high-intensity flood events occurred preferentially during warmer periods. In mild temperature conditions, both flood patterns are present. This underlines the complex relationship between flood hazards and climatic change in mountain areas. During the warmer and/or dryer times of the end of Iron Age and the Roman Period, both the frequency and intensity of floods increased. This is interpreted as an effect of human-induced clearing for grazing activities and reveals that anthropogenic interferences must be taken into account when reconstructing climatic signals from natural archives. (C) 2011 University of Washington. Published by Elsevier Inc. All rights reserved.

Author Keyword(s)
  • Grain size
  • Itrax core scanner
  • Flood frequency
  • Extreme precipitation events
  • Climatic changes
  • Land use
KeyWord(s) Plus
  • CLIMATE VARIABILITY
  • LAND-USE
  • HOLOCENE CLIMATE
  • EUROPEAN ALPS
  • RIVER FLOODS
  • ALPINE LAKE
  • SWISS ALPS
  • LE-BOURGET
  • NW ALPS
  • CAL BP
ESI Discipline(s)
  • Environment/Ecology
  • Geosciences
Web of Science Category(ies)
  • Geography, Physical
  • Geosciences, Multidisciplinary
Adress(es)

[Giguet-Covex, Charline; Arnaud, Fabien; Enters, Dirk; Rey, Pierre-Jerome; Wilhelm, Bruno; Delannoy, Jean-Jacques] Univ Savoie, EDYTEM, CNRS Pole Montagne, F-73376 Le Bourget Du Lac, France; [Poulenard, Jerome] Univ Savoie, INRA, CARRTEL, F-73376 Le Bourget Du Lac, France; [Millet, Laurent] Univ Franche Comte, UFR Sci & Tech, UMR CNRS 6249, Lab Chronoenvironm, F-25030 Besancon, France; [Francus, Pierre] Ctr Eau Terre & Environm, Inst Natl Rech Sci, Quebec City, PQ G1K 9A9, Canada; [Francus, Pierre] Geochem & Geodynam Res Ctr, Geotop, Montreal, PQ H3C 3P8, Canada; [Enters, Dirk] Univ Bremen, Inst Geog, GEOPOLAR, Bremen, Germany; [David, Fernand] Aix Marseille Univ, CEREGE, UMR 6635, F-13545 Aix En Provence 4, France

Reprint Adress

Giguet-Covex, C (reprint author), Univ Savoie, EDYTEM, CNRS Pole Montagne, F-73376 Le Bourget Du Lac, France.

Country(ies)
  • Canada
  • France
  • Germany
CNRS - Adress(es)
  • Centre européen de recherche et d'enseignement de géosciences de l'environnement (CEREGE), UMR7330
  • Chrono-environnement, UMR6249
  • Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), UMR5204
Accession Number
WOS:000299242600002
uid:/SCQMQPD8
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