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

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...

Full description

Saved in:
Bibliographic Details
Published in:Landslides 2012-06, Vol.9 (2), p.189-203
Main Authors: Lopez Saez, Jérôme, Corona, Christophe, Stoffel, Markus, Astrade, Laurent, Berger, Frédéric, Malet, Jean-Philippe
Format: Article
Language:English
Subjects:
Activation
Agriculture
Alps
Civil Engineering
Compressing
Earth and Environmental Science
Earth Sciences
Environmental Sciences
Geography
Geomorphology
Landslides
Landslides & mudslides
Mountains
Natural Hazards
Original Paper
Rainfall
Reconstruction
Seasons
Wood
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:1612-510X
1612-5118
DOI:10.1007/s10346-011-0284-6