Mapping Transport and Deposition Zones of Shallow Landslides Using Semi-quantitative Tools

Abstract

Landslide susceptibility and runout assessments have been widely discussed in the literature. However, there are few works identifying landslide runout zones (transport and deposition) arising from these processes in Brazil. Thus, the objective of this study is to evaluate transport and deposition dynamics of shallow landslides (runout) in the Atlantic Coastal Mountains and their relationship with the geometric characteristics of the slopes. A watershed that was widely affected by shallow landslides in January 2014 in the municipality of Itaoca (SP) was selected for study. Regarding the methodological procedures adopted, a ready-made scar inventory was used, which allowed the evaluation of the morphological parameters of curvature and slope angle, and the establishment of thresholds to produce a runout map for the 2014 event. This kind of evaluation permitted greater detailing sediment trajectory produced by the rupture, which can be used as a planning instrument in susceptible and densely occupied areas.