Characterization of a landslide-triggered debris flow at a rainforest-covered mountain region in Brazil
Reis, Fábio Augusto Gomes Vieira
D’Affonseca, Fernando Mazo
Lucía, Ana
dos Santos Corrêa, Claudia Vanessa
Veloso, Vinicius
Gramani, Marcelo Fischer
Ogura, Agostinho Tadashi
Lazaretti, Andrea Fregolente
Vemado, Felipe
Pereira Filho, Augusto José
dos Santos, Claudia Cristina
Lopes, Eymar Silva Sampaio
Rabaco, Lis Maria Reoni
do Carmo Giordano, Lucilia
Zarfl, Christiane
DOI: https://doi.org/10.1007/s11069-021-04811-9
Persistent URL: http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/11147
Reis, Fábio Augusto Gomes Vieira; Applied Geology Department, Earth and Exact Sciences Institute, São Paulo State University – UNESP, Rio Claro, Brazil
D’Affonseca, Fernando Mazo; Geo- und Umweltforschungszentrum (GUZ), University of Tübingen, Tübingen, Germany
Lucía, Ana; Geo- und Umweltforschungszentrum (GUZ), University of Tübingen, Tübingen, Germany
dos Santos Corrêa, Claudia Vanessa; Applied Geology Department, Earth and Exact Sciences Institute, São Paulo State University – UNESP, Rio Claro, Brazil
Veloso, Vinicius; Applied Geology Department, Earth and Exact Sciences Institute, São Paulo State University – UNESP, Rio Claro, Brazil
Gramani, Marcelo Fischer; Institute for Technological Research – IPT, São Paulo, Brazil
Ogura, Agostinho Tadashi; Institute for Technological Research – IPT, São Paulo, Brazil
Lazaretti, Andrea Fregolente; Brazilian Geological Service – CPRM, São Paulo, Brazil
Vemado, Felipe; Institute of Astronomy, Geophysics and Atmospheric Sciences, University of São Paulo – USP, São Paulo, Brazil
Pereira Filho, Augusto José; Institute of Astronomy, Geophysics and Atmospheric Sciences, University of São Paulo – USP, São Paulo, Brazil
dos Santos, Claudia Cristina; National Institute for Space Research – INPE, São José dos Campos, Brazil
Lopes, Eymar Silva Sampaio; National Institute for Space Research – INPE, São José dos Campos, Brazil
Rabaco, Lis Maria Reoni; Centro de Pesquisas e Desenvolvimento – CENPES, Rio de Janeiro, Brazil
do Carmo Giordano, Lucilia; Applied Geology Department, Earth and Exact Sciences Institute, São Paulo State University – UNESP, Rio Claro, Brazil
Zarfl, Christiane; Geo- und Umweltforschungszentrum (GUZ), University of Tübingen, Tübingen, Germany
Abstract
Debris flows represent great hazard to humans due to their high destructive power. Understanding their hydrogeomorphic dynamics is fundamental in hazard assessment studies, especially in subtropical and tropical regions where debris flows have scarcely been studied when compared to other mass-wasting processes. Thus, this study aims at systematically analyzing the meteorological and geomorphological factors that characterize a landslide-triggered debris flow at the Pedra Branca catchment (Serra do Mar, Brazil), to quantify the debris flow’s magnitude, peak discharge and velocity. A magnitude comparison with empirical equations (Italian Alps, Taiwan, Serra do Mar) is also conducted. The meteorological analysis is based on satellite data and rain gauge measurements, while the geomorphological characterization is based on terrestrial and aerial investigations, with high spatial resolution. The results indicate that it was a large-sized stony debris flow, with a total magnitude of 120,195 m3, a peak discharge of 2146.7 m3 s−1 and a peak velocity of 26.5 m s−1. The debris flow was triggered by a 188-mm rainfall in 3 h (maximum intensity of 128 mm h−1), with an estimated return period of 15 to 20 years, which, combined with the intense accumulation of on-channel debris (ca. 37,000 m3), indicates that new high-magnitude debris flows in the catchment and the region are likely to occur within the next two decades. The knowledge of the potential frequency and magnitude (F–M) can support the creation of F–M relationships for Serra do Mar, a prerequisite for reliable hazard management and monitoring programs.
Subjects
Shallow landslidesMagnitude
Serra do Mar
Forensic geomorphological analysis
Mass movements
Bedrock rivers