Abstract:
Debris fows are a type of natural disaster that posesgreat threat to infrastructure, humans and the environment. In Brazil, debris fows have caused signifcant damage, especially in the Serra do Mar Mountain region. The increasing frequency and intensity of extreme precipitation events in the country highlights the need for the development of effective landslide risk management strategies. In this study, we analyze the initiation and dynamics of a debris-fow event that occurred in the Toque-Toque Grande watershed based on numerical modeling, as well as the risk that debris-fow occurrences represent to pipeline crossings using the Debris-fow Hazard Index methodology. The Toque-Toque Grande watershed is located in São Sebastião, northern coast of the São Paulo state (Brazil), where in February 18–19, 2023, an unprecedent precipitation event triggered landslides and debris fows. The results revealed that the intensifcation of extreme precipitation frequency and volume over short periods demands a more in-depth analysis. Instantaneous events, occurring without prior accumulations, are becoming increasingly frequent. It becomes imperative to urgently comprehend their dynamics and their relationship with natural disasters, especially debris fows, and their impact on urban centers and strategic infrastructures
along impact routes. The increasing frequency and intensity of extreme precipitation events highlight the need for adaptable risk management strategies focused on prevention to mitigate impacts on infrastructure, society, and the environment. Additionally, the study emphasizes the urgency of structural protection measures following the magnitude of the 2023 event, evidenced by meteorological and geomorphological assessments, highlighting the infuence of physical environmental conditions on the formation of debris flows. Computational modeling aided in visualizing the dynamics of the fow, providing crucial understanding for its dynamics. The identifcation of high-risk areas and the implementation of containment measures, exemplifed by the protection structure of Transpetro in the Toque-Toque Grande basin, highlight the importance of proactive structural measures in impact
mitigation. Essentially, this study sought to demonstrate the complexity of debris fow risk management, advocating for multidisciplinary approaches, prevention strategies, emergency response, and infrastructure protection in the face of environmental and operational challenges
Referência:
VELOSO, Vinicius Queiroz; REIS, Fabio Augusto Vieira Gomes; CABRAL, Victor; GRAMANI, Marcelo Fischer; RIBEIRO, Thiago Castro; OGURA, Agostinho Tadashi; CORREA, Claudia Vanessa dos Santos; MASCARENHAS, Pedro Victor Serra; RUSSO, Wanderley; SÁNCHEZ, Joana Paula; KUHN, Caiubi Emanuel Souza; GIORDANO, Lucilia do Carmo. Application of the debris-flow hazard index for pipelines in the contexto of the hydrogeological disaster of February 2023 in São Sebastião, Serra do Mar. Landslides, Journal of the International Consortium on Landsalides, v.21, n.9, 2024.
Acesso ao artigo no site do Periódico:
https://link.springer.com/article/10.1007/s10346-024-02319-4
