Landslide susceptibility mapping based on rainfall scenarios: a case study from Sao Paulo in Brazil

Leila Maria Ramos; Thiago Bazzan; Mariana Ferreira Benessiuti Motta; George de Paula Bernardes; Heraldo Luiz Giacheti; Leila Maria Ramos; Thiago Bazzan; Mariana Ferreira Benessiuti Motta; George de Paula Bernardes; Heraldo Luiz Giacheti

doi:10.3934/geosci.2022024

AIMS Geosciences

2022, Volume 8, Issue 3: 438-451. doi: 10.3934/geosci.2022024

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Landslide susceptibility mapping based on rainfall scenarios: a case study from Sao Paulo in Brazil

1.
Department of Civil Engineering, UNESP, Guaratinguetá, SP, Brazil
2.
Earth Observation and Geoinformatics Division, National Institute for Space Research, São José dos Campos, São Paulo, Brazil
3.
Department of Civil and Environmental Engineering, UNESP, Bauru, SP, Brazil

Received: 05 March 2022 Revised: 09 June 2022 Accepted: 22 June 2022 Published: 14 July 2022

Mass movement susceptibility mapping from rainfall data and in situ site characterization constitute an important approach for preventing geological-geotechnical accidents on railroads and highways. A comprehensive site characterization program was conducted to identify slopes with mass movements along the 44 km of SP-171 road in the state of Sã o Paulo, Brazil. Ninety-two slopes with some degree of instability were found along this section of the road, including rupture scars, active erosive processes and the presence of unstable rock blocks. Two scenarios for mass movement susceptibility (100 mm and 500 mm of accumulated rainfall) were defined by overlaying thematic maps of relief, soil type, geology, accumulated rainfall and declivity using geographic information system-based techniques. The results for both scenarios identified the regions with high and medium susceptibility to mass movements; for the scenario of 100 mm of accumulated rainfall; we found that 27% and 73% of the land area of SP-171 is respectively highly and moderately susceptible to landslide events. For the scenario of 500 mm, we found 58% and 40% to be highly and moderately susceptible areas. This study also allowed us to identify the main geotechnical problems along the 44 km of this road, and thus can be used to guide actions and decisions to avoid or minimize such problems.
- geotechnical cartography,
- GIS,
- landslide studies,
- susceptibility,
- rainfall
Citation: Leila Maria Ramos, Thiago Bazzan, Mariana Ferreira Benessiuti Motta, George de Paula Bernardes, Heraldo Luiz Giacheti. Landslide susceptibility mapping based on rainfall scenarios: a case study from Sao Paulo in Brazil[J]. AIMS Geosciences, 2022, 8(3): 438-451. doi: 10.3934/geosci.2022024

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Abstract

Mass movement susceptibility mapping from rainfall data and in situ site characterization constitute an important approach for preventing geological-geotechnical accidents on railroads and highways. A comprehensive site characterization program was conducted to identify slopes with mass movements along the 44 km of SP-171 road in the state of Sã o Paulo, Brazil. Ninety-two slopes with some degree of instability were found along this section of the road, including rupture scars, active erosive processes and the presence of unstable rock blocks. Two scenarios for mass movement susceptibility (100 mm and 500 mm of accumulated rainfall) were defined by overlaying thematic maps of relief, soil type, geology, accumulated rainfall and declivity using geographic information system-based techniques. The results for both scenarios identified the regions with high and medium susceptibility to mass movements; for the scenario of 100 mm of accumulated rainfall; we found that 27% and 73% of the land area of SP-171 is respectively highly and moderately susceptible to landslide events. For the scenario of 500 mm, we found 58% and 40% to be highly and moderately susceptible areas. This study also allowed us to identify the main geotechnical problems along the 44 km of this road, and thus can be used to guide actions and decisions to avoid or minimize such problems.

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