Characterization of a landslide-triggered debris flow at a rainforest-covered mountain region in Brazil

Author:

Cabral Victor CarvalhoORCID,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

Abstract

AbstractDebris 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 (FM) can support the creation of FM relationships for Serra do Mar, a prerequisite for reliable hazard management and monitoring programs.

Funder

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior

Conselho Nacional de Desenvolvimento Científico e Tecnológico

Eberhard Karls Universität Tübingen

Publisher

Springer Science and Business Media LLC

Subject

Earth and Planetary Sciences (miscellaneous),Atmospheric Science,Water Science and Technology

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