Possible use of tree-growth disturbances to record landslide movements as a complement to conventional monitoring techniques and remotely sensed data analysis in forested areas
摘要
Knowledge about the history of landslide movements is crucial for determining landslide hazard, predicting future reactivation development, as well as evaluating triggers. Obtaining such information in forested regions largely depends on in situ monitoring techniques, which are expensive, labor intensive, environmentally disturbing, and rarely capture the landslide movements in their full complexity. We argue that recent methodological advances of dendrochronological research allow the use of tree-growth responses to landslide movement as an invaluable addition to site monitoring techniques, providing reliable information about landslide movement reactivation frequencies, their intensities (distinguishing from creep and sliding) and spatial extent. The article outlines methodological approaches for the best use of trees in recording landslide movements and identifies the principal limitations, among which are the age of the trees and the lack of verification of the dendrochronological results by comparison with in-situ instrumental monitoring. Despite these disadvantages, the presented method may fill a knowledge gap of long-term landslide movement histories in forested, un-gauged areas, which may represent regions with underestimated landslide risk.