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Análise da Influência da Distribuição da Chuva e do Relevo no Desencadeamento de Escorregamentos por Meio da Compartimentação Fisiográfica

2019; UNIVERSIDADE FEDERAL DO RIO DE JANEIRO; Volume: 42; Issue: 2 Linguagem: Inglês

ISSN

1982-3908

Autores

Victor Carvalho Cabral, Fábio Augusto Gomes Vieira Reis, Claudia Vanessa dos Santos Corrêa, Carolina Martinez Mendoza, Lucília do Carmo Giordano, Natália Rafaela de Almeida,

Tópico(s)

Geography and Environmental Studies

Resumo

Physiographic compartmentalisation emerges as an important instrument in urban planning and risk assessment of mountainous areas, identifying regions where natural erosive processes are more likely to occur based on landform features. The Serra do Mar escarpments are naturally prone to landslide occurrences, due to its landform characteristics and climate, and studies that correlate triggering (rainfall) with controlling (landform) factors are fundamental in the development of urban planning and risk assessment programmes. In this context, this study aims to assess the landslide susceptibility of the Pereque and Mogi River watersheds, in Cubatao (Sao Paulo), by compartmentalising the study area considering its physiographic features and discussing the role of rainfall and landform on landslide initiation, according to the 1985 and 1994’s landslide events. Physiographic units were separated based on aerial photographs, following geomorphometric criteria such as water bodies and landform elements density, amplitude and slope. Rainfall distribution was based on pluviometric data from five rain gauges that cover the area. Six units were identified, as a result, and those at the northern slope of the Mogi River exhibit higher susceptibility to triggering landslides. This higher susceptibility can be attributed to steep slopes and thin soils, anthropic activities and, especially, rainfall concentration. Physiographic compartmentalisation, therefore, is an important auxiliary tool providing groundwork for more detailed studies in finer scales.

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