Mountain regions have geological and geomorphological features that make them attractive for leisure and tourism activities; land occupation and seasonal population in many mountain areas are consequently increasing, together with impacts on the natural environment and geomorphological risks for human activities and infrastructures. We aims to understand the present and past geomorphologic processes in the periglacial environment of the Veny valley (Courmayeur, Ao), and to study their interaction with the morpho-structural setting, by using geomatics techniques. First, the field data have been collected using pocket-PC and integrated GPS whit mobile GIS, in order to create an ESRI-GIS based geodatabase. Considering the alpine context of the area, stereoscopic models from the ’97 and ‘03 flights with a 4 m precision were built to map geomorphological features in inaccessible area. Contemporaneously, to support these data, LiDAR ‘08 images were processed to include hillshade, slope, and aspect maps. Two areas of keen geomatics interest were iidentified: the potential failure surfaces of the Mont Rouge de Peuterey and the Miage glacial basin. Using the Coltop 3D software, kinematic analysis of the data were performed using the Markland test. MIVIS ’99 images analysis allowed to classify the debris cover of Miage Glacier and detected the potential rock instability using the Principal Component Analysis (PCA). On the same slopes close range photogrammetry was performed to measure joint sets setting. Data interpretation yielded to obtain three geotematics layers: a) geomorphologic, within mapped landforms b) morpho-structural, concerning the structural evolution c) debris cover of Miage glacier, for the multitemporal analysis. The remote sensing technologies showed to be more affordable than the usual field-based approaches, in the perspective of a safe analysis of stability conditions in mountainous areas
Understanding geoenvironmental dynamics and hazards of high mountains: the Geo-Morpho-Structural assessment of Veny Valley (W-Alps, Italy)
GIARDINO, Marco;PEROTTI, Luigi;BACENETTI, MARCO
2013-01-01
Abstract
Mountain regions have geological and geomorphological features that make them attractive for leisure and tourism activities; land occupation and seasonal population in many mountain areas are consequently increasing, together with impacts on the natural environment and geomorphological risks for human activities and infrastructures. We aims to understand the present and past geomorphologic processes in the periglacial environment of the Veny valley (Courmayeur, Ao), and to study their interaction with the morpho-structural setting, by using geomatics techniques. First, the field data have been collected using pocket-PC and integrated GPS whit mobile GIS, in order to create an ESRI-GIS based geodatabase. Considering the alpine context of the area, stereoscopic models from the ’97 and ‘03 flights with a 4 m precision were built to map geomorphological features in inaccessible area. Contemporaneously, to support these data, LiDAR ‘08 images were processed to include hillshade, slope, and aspect maps. Two areas of keen geomatics interest were iidentified: the potential failure surfaces of the Mont Rouge de Peuterey and the Miage glacial basin. Using the Coltop 3D software, kinematic analysis of the data were performed using the Markland test. MIVIS ’99 images analysis allowed to classify the debris cover of Miage Glacier and detected the potential rock instability using the Principal Component Analysis (PCA). On the same slopes close range photogrammetry was performed to measure joint sets setting. Data interpretation yielded to obtain three geotematics layers: a) geomorphologic, within mapped landforms b) morpho-structural, concerning the structural evolution c) debris cover of Miage glacier, for the multitemporal analysis. The remote sensing technologies showed to be more affordable than the usual field-based approaches, in the perspective of a safe analysis of stability conditions in mountainous areas
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