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Abstract(s)
Este trabalho tem como enfoque a análise de estabilidade de taludes com recurso a imagem aérea
de satélite obtida através da ferramenta Google Earth. Para a análise foi criada e implementada
uma matriz subdividida em três tabelas com características que influenciam a estabilidade taludes.
A primeira tabela diz respeito a tópicos analisados na imagem de satélite, na segunda consiste numa
análise secundária com recurso a ferramenta google Earth e à investigação de informação referente
ao local e a terceira tabela conta com uma análise de campo com características observacionais e
geomecânicas. A matriz é quantificada com valores compreendidos entre 1 e 3, sendo 1 o de menor
risco. A matriz foi aplicada a três casos distintos que apresentavam um recuo evidente da linha de
crista observada nas imagens de satélite, são eles: São Pedro de Moel, Paimogo e Assentiz. Estes
três locais distinguem-se por apresentarem condições geológico-geotécnicas e geometrias dos
próprios taludes distintas. Inicialmente tem-se como procedimento a observação das imagens de
satélite dos respetivos locais, de períodos distintos, de forma a identificar a crista dos taludes em
cada imagem. Posteriormente, as linhas de cristas são sobrepostas e comparadas com intuito de se
observar o recuo da crista representado pelas linhas. Os locais de recuo foram individualizados em
números de taludes e estudados singularmente com a aplicação da matriz. Esta metodologia
apresenta algumas limitações e dificuldade de obtenção de certos parâmetros que podem ser
colmatadas com futuras melhorias, no entanto, salienta-se a vantagem desta metodologia ter uma
aplicação remota e poder ser utilizada como ferramenta de identificação expedita e preliminar na
deteção de zonas com risco de instabilidade, para posterior análise mais detalhada e rigorosa.
This work focuses on the slope stability analysis using aerial satellite images obtained through the Google Earth tool. A matrix was created and implemented for the analysis, subdivided into three tables with characteristics that influence slope stability. The first table refers to topics analyzed in the satellite image, the second consists of a secondary analysis using the Google Earth tool and investigating information regarding the site, and the third table includes a field analysis with observational and geomechanical characteristics. The matrix is quantified with values between 1 and 3, with 1 being the lowest risk. The matrix was applied to three cases showing a clear retreat of the ridgeline observed in the satellite images: São Pedro de Moel, Paimogo and Assentiz. These three sites are distinguished by their different geological-geotechnical conditions and slope geometries. Initially, the procedure was to look at satellite images of the respective sites from different periods to identify the crest of the slopes in each image. Subsequently, the ridge lines were superimposed and compared to observe the ridge retreat represented by the lines. The retreat locations were individualized in the number of slopes and studied singularly with the matrix application. This methodology has some limitations, and it is difficult to obtain specific parameters, which can be overcome with future improvements. However, the advantage of this methodology is that it can be applied remotely and used as a practical and preliminary identification tool for detecting areas at risk of instability for later more detailed and rigorous analysis.
This work focuses on the slope stability analysis using aerial satellite images obtained through the Google Earth tool. A matrix was created and implemented for the analysis, subdivided into three tables with characteristics that influence slope stability. The first table refers to topics analyzed in the satellite image, the second consists of a secondary analysis using the Google Earth tool and investigating information regarding the site, and the third table includes a field analysis with observational and geomechanical characteristics. The matrix is quantified with values between 1 and 3, with 1 being the lowest risk. The matrix was applied to three cases showing a clear retreat of the ridgeline observed in the satellite images: São Pedro de Moel, Paimogo and Assentiz. These three sites are distinguished by their different geological-geotechnical conditions and slope geometries. Initially, the procedure was to look at satellite images of the respective sites from different periods to identify the crest of the slopes in each image. Subsequently, the ridge lines were superimposed and compared to observe the ridge retreat represented by the lines. The retreat locations were individualized in the number of slopes and studied singularly with the matrix application. This methodology has some limitations, and it is difficult to obtain specific parameters, which can be overcome with future improvements. However, the advantage of this methodology is that it can be applied remotely and used as a practical and preliminary identification tool for detecting areas at risk of instability for later more detailed and rigorous analysis.
Description
Keywords
Slope Stability Google Earth Geotechnical Risk Matrix