UNIGE document Scientific Article
previous document  unige:124350  next document
add to browser collection
Title

Dendrogeomorphic reconstruction of past landslide reactivation with seasonal precision: the Bois Noir landslide, southeast French Alps

Authors
Lopez Saez, Jérôme
Corona, Christophe
Astrade, Laurent
Berger, Frédéric
Malet, Jean-Philippe
Published in Landslides. 2012, vol. 9, no. 2, p. 189-203
Abstract The purpose of this study was to reconstruct spatiotemporal patterns of past landslide reactivation in a forested area of the Barcelonnette Basin (Bois Noir landslide, Southern French Alps). Analysis of past events was based on tree ring series from 79 heavily affected Mountain pine (Pinus uncinata Mill. ex Mirb) trees growing near or next to the landslide body. Dendrogeomorphic analysis focused on the presence of compression wood and growth reductions, with the first reaction being used for a dating of past reactivations with seasonal precision. A total of 151 growth disturbances were identified in the samples representing eight different stages of reactivation of the landslide body between 1874 and 2008. The spatiotemporal accuracy of the reconstruction is confirmed by historical records from neighboring sites and by aerial photographs. The onset of compression wood formation allows identifying five stages of landslide reactivation during the dormant season or the very beginning of the growing season of trees, i.e., between early October and late May, and three stages toward the end of the growth period. Monthly rainfall data from the HISTALP database demonstrate that the rainfall during four out of the eight reactivations are characterized by summer rainfall totals (July–August) exceeding 200 mm, pointing to the important role of summer rainstorms in the triggering of events at the Bois Noir landslide body.
Keywords DendrogeomorphologyLandslidesGrowth disturbancesSeasonal precisionFrench Alps
Identifiers
Full text
Article (Published version) (2.6 MB) - document accessible for UNIGE members only Limited access to UNIGE
Other version: http://link.springer.com/10.1007/s10346-011-0284-6
Structures
Research group Climatic Change and Climate Impacts
Citation
(ISO format)
LOPEZ SAEZ, Jérôme et al. Dendrogeomorphic reconstruction of past landslide reactivation with seasonal precision: the Bois Noir landslide, southeast French Alps. In: Landslides, 2012, vol. 9, n° 2, p. 189-203. doi: 10.1007/s10346-011-0284-6 https://archive-ouverte.unige.ch/unige:124350

27 hits

0 download

Update

Deposited on : 2019-10-15

Export document
Format :
Citation style :