Tree Ring-Based Estimation of Landslide Areal Reactivation as a Fundament of Magnitude–Frequency Assessment
Open Access
- 3 April 2020
- Vol. 11 (4), 400
- https://doi.org/10.3390/f11040400
Abstract
Magnitude–frequency (M–F) relationships represent important information on slope deformation and are used in hazard assessment or as supporting data for urban planning. Various approaches have been used to extract such relationships in the past, but most of these methods drove at the problem of exact events´ frequency determination. Dendrogeomorphic (tree ring-based) approaches are actually thought to be the most precise method of dating past mass movement events that occurred within the last several centuries. Together with information on the spatial positions of the analysed trees, they represent a potentially very valuable tool for reconstructing M–F relationships, although their use for this purpose has been very rare in the past. In this study, M–F relationships are reconstructed using dendrogeomorphic methods for three landslides of different types (a translational slide, a flow-like slide, and a rotational slide) occurring in different geological materials (thick-bedded flysch, limestone marls, and volcanic breccia). In total, 572 disturbed trees were analysed, and chronologies of mass movement events were built. Landslide magnitudes were expressed in three ways: (i) the value of the standard It index; (ii) the area, as determined using homogenous morphological units; and (iii) the area, as determined using tree buffers. The power-law nature of M–F relationships was confirmed for all the landslides that were studied and using all the approaches that were applied. All of the combinations of results yielded high correlation values; nevertheless, differences were noted. The advantages and limitations of each approach used to reconstruct M–F relationships are also discussed.Keywords
This publication has 56 references indexed in Scilit:
- Tree-ring analysis in the reconstruction of slope instabilities associated with earthquakes and precipitation (the Crimean Mountains, Ukraine)Geomorphology, 2012
- Dendrogeomorphic reconstruction of past landslide reactivation with seasonal precision: the Bois Noir landslide, southeast French AlpsLandslides, 2011
- Spatio-temporal reconstruction of snow avalanche activity using tree rings: Pierres Jean Jeanne avalanche talus, Massif de l'Oisans, FranceCATENA, 2010
- Tree-ring reconstruction of past debris flows based on a small number of samples—possibilities and limitationsLandslides, 2009
- Probability distributions of landslide volumesNonlinear Processes in Geophysics, 2009
- Sediment transfer processes in two Alpine catchments of contrasting morphological settingsJournal of Hydrology, 2009
- Power-law correlations of landslide areas in central ItalyEarth and Planetary Science Letters, 2002
- Dating of geomorphological processes using dendrogeomorphological methodsCATENA, 1997
- Spatial and temporal analysis of mass movement using dendrochronologyCATENA, 1987
- Dendrogeomorphological Analysis of Mass Movement on Table Cliffs Plateau, UtahQuaternary Research, 1978