Modelagem espacial dinâmica aplicada ao estudo de movimentos de massa em uma região da serra do mar paulista, na escala de 1:10.000
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2006-11-10
Autores
Lopes, Eymar Silva Sampaio [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
Um modelo dinamico com caracteristicas friccionais, que utiliza como parametros basicos o angulo de atrito interno do material ( int Ó ) e basal ( bed Ó ) com a superficie onde ocorre o movimento, foi calibrado e aplicado com objetivo de simular as mesmas condicoes em que ocorreram corridas de massa nos anos de 1985, 1994 e 1999, em tres bacias da Serra do Mar, na regiao de Cubatao (SP-Brasil), na escala 1:10.000. Um modelo estatico de estabilidade por talude infinito, definido atraves do indice de estabilidade (SI), foi aplicado para subsidiar o estudo de areas com potencial aos processos de escorregamentos translacionais rasos, que podem evoluir para corridas de massa. Um inventario de cicatrizes tambem foi elaborado a partir da interpretacao de produtos de sensoriamento remoto, utilizado para validar o modelo estatico, assim como para definir pilhas de materiais deflagradas no modelo dinamico. Os resultados com o modelo estatico mostraram-se mais adequados quando se utilizaram as unidades litologicas para variacao dos parametros geotecnicos. Mais de 85% das cicatrizes ficaram dentro dos limites inferior de estabilidade e superior de instabilidade. As simulacoes com o modelo dinamico permitiram criar diferentes cenarios, com caracteristicas como trajetoria e alcance do material mobilizado, semelhantes aos eventos ocorridos no passado. Para tal modelo, diferentes configuracoes de pilhas de materiais e variacoes do angulo de atrito basal, em funcao do mapa de materiais, permitiram simulacoes mais realistas.
A dynamic model with frictional characteristics that uses as basic parameters internal friction angle of the material ( int Ó ) and bed friction angle ( bed Ó ) with the surface where movement occurs was calibrated and applied to simulate the same conditions under which debris flows occurred in the years 1985, 1994 and 1999, in three watersheds of the Serra do Mar, in the region of Cubatao (Sao Paulo, Brasil), on a scale of 1:10.000. A static model of infinite slope stability, defined using the stability index (SI), was applied to inform the study of areas that have potential for processes of shallow translational landsliding that could evolve into debris flows. Landslide inventory data was also elaborated based on the interpretation of remote sensing products, used to validate the static model as well as to define deflagrated pile material in the dynamic model. The results with the static model proved to be more satisfactory when the lithological boundaries were used for variation of the geotechnical parameters. More than 85% of the scarps were within the lower threshold stability and upper threshold instability. The simulations with the dynamic model allowed the creation of different scenarios with characteristics, such as trajectory and range of the mobilized material, similar to the events that occurred in the past. For this model, different configurations of pile material and variations in the bed friction angle, as a function of the materials map, made it possible to carry out more realistic simulations.
A dynamic model with frictional characteristics that uses as basic parameters internal friction angle of the material ( int Ó ) and bed friction angle ( bed Ó ) with the surface where movement occurs was calibrated and applied to simulate the same conditions under which debris flows occurred in the years 1985, 1994 and 1999, in three watersheds of the Serra do Mar, in the region of Cubatao (Sao Paulo, Brasil), on a scale of 1:10.000. A static model of infinite slope stability, defined using the stability index (SI), was applied to inform the study of areas that have potential for processes of shallow translational landsliding that could evolve into debris flows. Landslide inventory data was also elaborated based on the interpretation of remote sensing products, used to validate the static model as well as to define deflagrated pile material in the dynamic model. The results with the static model proved to be more satisfactory when the lithological boundaries were used for variation of the geotechnical parameters. More than 85% of the scarps were within the lower threshold stability and upper threshold instability. The simulations with the dynamic model allowed the creation of different scenarios with characteristics, such as trajectory and range of the mobilized material, similar to the events that occurred in the past. For this model, different configurations of pile material and variations in the bed friction angle, as a function of the materials map, made it possible to carry out more realistic simulations.
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Palavras-chave
Geologia de engenharia, Cubatão (SP), Escorregamentos, Corridas de massa, Simulação, SIG, Landslides, Debris flows, Simulation, GIS
Como citar
LOPES, Eymar Silva Sampaio. Modelagem espacial dinâmica aplicada ao estudo de movimentos de massa em uma região da serra do mar paulista, na escala de 1:10.000. 2006. xx, 276 f. Tese (doutorado) - Universidade Estadual Paulista, Instituto de Geociências e Ciências Exatas, 2006.