TY  - JOUR
A1  - Cabral, Victor Carvalho
A1  - Reis, Fábio Augusto Gomes Vieira
A1  - D’Affonseca, Fernando Mazo
A1  - Lucía, Ana
A1  - dos Santos Corrêa, Claudia Vanessa
A1  - Veloso, Vinicius
A1  - Gramani, Marcelo Fischer
A1  - Ogura, Agostinho Tadashi
A1  - Lazaretti, Andrea Fregolente
A1  - Vemado, Felipe
A1  - Pereira Filho, Augusto José
A1  - dos Santos, Claudia Cristina
A1  - Lopes, Eymar Silva Sampaio
A1  - Rabaco, Lis Maria Reoni
A1  - do Carmo Giordano, Lucilia
A1  - Zarfl, Christiane
T1  - Characterization of a landslide-triggered debris flow at a rainforest-covered mountain region in Brazil
Y1  - 2021-05-30
VL  - 108
IS  - 3
SP  - 3021
EP  - 3043
JF  - Natural Hazards
DO  - 10.1007/s11069-021-04811-9
PB  - Springer Netherlands
N2  - 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 m<sup>3</sup>, a peak discharge of 2146.7 m<sup>3</sup> s<sup>−1</sup> and a peak velocity of 26.5 m s<sup>−1</sup>. The debris flow was triggered by a 188-mm rainfall in 3 h (maximum intensity of 128 mm h<sup>−1</sup>), with an estimated return period of 15 to 20 years, which, combined with the intense accumulation of on-channel debris (ca. 37,000 m<sup>3</sup>), 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.
UR  - http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/11147
ER  -