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Hazard assessment of debris-flow-prone watersheds in Cubatão, São Paulo State, Brazil

Vinícius Queiroz Veloso; Fabio Augusto Vieira Gomes Reis; José Eduardo Zaine; Claudia Vanessa dos Santos Corrêa; Marcelo Fischer Gramani; Caiubi Emmanuel Kuhn


In Brazil, research related to the occurrence and prevention of debris fows is incipient when compared to the extent of the impacts caused by the phenomena. There is a need for further studies that consider susceptibility and hazard, especially in areas that are environmentally and socioeconomically vulnerable. This study aimed at assessing debris-fow hazard in the Rio das Pedras watershed, in Cubatão (State of São Paulo, Brazil), based on a set of diferent physiographic parameters (geomorphological, morphometric, geological) and in the application of empirical models. The hazard assessment was based on: (1) the evaluation of the history of events in the region; (2) the identifcation of the geomorphic controlling factors; (3) the estimation of the magnitude of a potential event; and (4) the identifcation of the elements at hazard. The results show that a debris-fow event in Rio das Pedras would more severely impact the Anchieta Highway (SP-150), the gas pipeline GASAN, the oil pipeline OSSP and the districts Pinhal do Miranda and Cota 95. These results highlight the relevance of geomorphological and geological parameters when estimating the extent of debris runof, which is essential when defning the hazard in a debrisfow-prone watershed.

VELOSO, Vinícius Queiroz; REIS, Fabio Augusto Vieira Gomes; ZAINE, José Eduardo; CORRÊA, Claudia Vanessa dos Santos; GRAMANI, Marcelo Fischer; KUHN, Caiubi Emmanuel. Hazard assessment of debris-flow-prone watersheds in Cubatão, São Paulo State, Brazil. Natural Hazards, v.115, n.1, 20p., 2023.

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