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

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-wastin...

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Veröffentlicht in:Natural hazards (Dordrecht) 2021-09, Vol.108 (3), p.3021-3043
Hauptverfasser: Cabral, Victor Carvalho, 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
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container_issue 3
container_start_page 3021
container_title Natural hazards (Dordrecht)
container_volume 108
creator Cabral, Victor Carvalho
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
description 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 3 , a peak discharge of 2146.7 m 3  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 m 3 ), 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.
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subjects Catchment area
Civil Engineering
Debris flow
Detritus
Discharge
Earth and Environmental Science
Earth Sciences
Empirical equations
Environmental Management
Flood peak
Geomorphology
Geophysics/Geodesy
Geotechnical Engineering & Applied Earth Sciences
Hazard assessment
Hydrogeology
Hydrogeomorphology
Landslides
Mountain regions
Mountains
Natural Hazards
Original Paper
Rain
Rain gauges
Rainfall
Rainforests
Satellite data
Spatial discrimination
Spatial resolution
Tropical climate
Tropical environment
Tropical environments
Velocity
title Characterization of a landslide-triggered debris flow at a rainforest-covered mountain region in Brazil
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