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Análise dos parâmetros morfológicos de escorregamentos rasos na Serra do Mar, Paraná
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Orientador(es)
Resumo(s)
O mapeamento das cicatrizes de escorregamentos é uma importante ferramenta para compreender a espacialização e os fatores condicionantes destesprocessos, permitindo avaliar as principais características do relevo associadas à sua deflagração. O objetivo deste trabalho, portanto, foi realizar uma análise morfológica a partir do mapa de cicatrizes para duas bacias hidrográficas no município de Antonina (PR), afetadas por escorregamentos em 2011. O mapa de cicatrizes foi elaborado a partir de dados da literatura e com investigações de campo, enquanto que para a definição de classes de ângulo das encostas, área de contribuição, curvatura e seções, fez-se uso de um Modelo Digital de Terreno (MDT). Em ambas as bacias as cicatrizes se concentraram entre 20° e 30° e, em relação à área de contribuição, a classe Log 10(m²) 1,7-2,1 registrou a maior ocorrência de cicatrizes, sendo cerca de 56% na BHBB e 49% na BHL. A curvatura côncava e as seções dos terços médios e inferiores registraram o maior número de cicatrizes. Os resultados mostraram uma diferença entre os perímetros das cicatrizes dos trabalhos consultados e daqueles obtidos nesta pesquisa. Esta diferença, pode comprometer a distribuição percentual final entre os parâmetros morfológicos e a ocorrência de escorregamentos.
The mapping of landslide scars is an important tool to understand the spatial distribution and conditioning factors behind these processes, thus permitting the assessment of main landform characteristics associated to their triggering. Therefore, the aim of this work was to conduct a morphologicalanalysis based on the landslide scars map for two catchments in the municipality of Antonina (PR), that were affected by landslides in 2011. The landslide scars map was elaborated by coupling literature data with fieldwork investigation, whereas the definition of slope angle classes, contribution areas, slope curvature and sections were determined by means of a DEM (Digital Elevation Model). In both catchments scars were concentrated on slopes between 20° and 30° and, regarding the contributing area, within the Log 10(m²) 1.7-2.1 class, corresponding to approximately 56% of the scars in BHBB and 49% in BHL. The concave curvature profile as well as the lower and middle thirds of the slope concentrated the higher occurrence of scars. Results also point to a variation between scar perimeters of quoted literature data and those found by this research. This discrepancy may compromise final percentage distribution of morphological parameters and their linkage to landslide frequency.
The mapping of landslide scars is an important tool to understand the spatial distribution and conditioning factors behind these processes, thus permitting the assessment of main landform characteristics associated to their triggering. Therefore, the aim of this work was to conduct a morphologicalanalysis based on the landslide scars map for two catchments in the municipality of Antonina (PR), that were affected by landslides in 2011. The landslide scars map was elaborated by coupling literature data with fieldwork investigation, whereas the definition of slope angle classes, contribution areas, slope curvature and sections were determined by means of a DEM (Digital Elevation Model). In both catchments scars were concentrated on slopes between 20° and 30° and, regarding the contributing area, within the Log 10(m²) 1.7-2.1 class, corresponding to approximately 56% of the scars in BHBB and 49% in BHL. The concave curvature profile as well as the lower and middle thirds of the slope concentrated the higher occurrence of scars. Results also point to a variation between scar perimeters of quoted literature data and those found by this research. This discrepancy may compromise final percentage distribution of morphological parameters and their linkage to landslide frequency.
Descrição
Palavras-chave
Ângulo de Encosta Área de Contribuição Curvatura Cicatrizes
Contexto Educativo
Citação
Martins, T. D., Oka-Fiori, C., Vieira, B.C., Corrêa, A.C.B., & Bateira, C. (2017). Análise dos parâmetros morfológicos de escorregamentos rasos na Serra do Mar, Paraná. Caminhos de Geografia, 18(63), 223-239. http://dx.doi.org/10.14393/RCG186310
Editora
Universidade Federal de Uberlândia