1,721,076 research outputs found
Geomatics for slope stability and rock fall runout analysis: A case study along the Alta Tambura road in the Apuan Alps (Tuscany, Italy)
No full textWith increasing awareness of geological risks, the study of rocky slopes plays a key role in the Earth Sciences, especially in areas of high vulnerability due to the presence of human settlement. The present paper describes the stability and runout analyses carried out along the Alta Tambura road, in correspondence with the Guadine village connecting the Massa urban settlement to the Apuan Alps (Tuscany, Italy). The integration among various types of survey and analytical methodologies allowed for the application of up-to-date approaches for hazard assessment. Results from these types of studies are useful in the decision-making process concerning choosing the most appropriate mitigation works and, as in such a case, their a posteriori validation. With regard to the survey techniques, terrestrial laser scanning and digital close-range photogrammetry were used to produce the digital elevation model, oriented stereo-images, orthophotos and accurate positions and volumes of rocky wedges and joints located on the slope overhanging the analyzed road. Thanks to this data, a deterministic stability analysis was conducted and the spatial distribution of rock fall density, velocities and kinetic energies was modeled by means of the "cone-method". Historical evidence of rock falls, identified during fieldwork activities and photointerpretation, were used to assess and calibrate the accuracy of results obtained from the method and allowed, through a further 2D rock fall runout analysis, the calculation of the dissipation energy that protection measures need to mitigate the risk in the area
Laser Scanning for the definition of high resolution topography in the Apuan Alps (IT) marble district
No full textGeomatics and Distinct Elements Numerical Methods for analyzing the stability of a rock slope in the Apuan Alps marble district (Italy)
No full textTecnologie geomatiche per l'analisi di stabilità dei fronti rocciosi tramite modellazione numerica ad elementi distinti
No full textWith the increasing awareness to the geological risks, the study of rock slope stability plays a key role in the Earth Sciences, especially in areas with high vulnerability for the presence of infrastructures and human activities. These issues require an accurate analysis of the geological processes which knowledge can be obtained from several independent or integrated measurement techniques; nowadays, Digital Terrestrial Photogrammetry (DTP) and Laser Scanning (LS) are some of the most widespread techniques used in studying the slope stability. The engineering-geological data and the geometrical setting of the rock slopes and discontinuities (ex. attitude and spacing) are needed to study the geological risk related to the stability of natural or artificial fronts. DTP and LS allow to get this information also in inaccessible sites and they permit to manage data within a GIS. In addition, it is always necessary to know the physical-mechanical properties of intact material and joints; such information come either from laboratory or in situ tests and from engineering-geological surveys. Data collected by traditional methods and recent geomatics techniques, have allowed an accurate analysis of slope stability by means of distinct elements numerical modeling; in such a way the mass stress has been evaluated and the possible failure mechanisms recognized
Il rilievo geostrutturale dei fronti rocciosi: confronto tra accuratezze di dati provenienti da Fotogrammetria Digitale Terrestre e Laser Scanning
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Radargrammetry and SAR interferometryfor DEM generation in the area of Siwa (Egypt): validation and data fusion
No full text“Cone method” and 2d simulation for rock fall risk assessment in the Marina Piccola bay (Capri Island Italy)
No full textWith the increasing awareness to the geological risks, the study of rocky slopes plays a key role in the earth sciences, especially in areas of high vulnerability due to the presence of infrastructures and human activities. The present paper describes the stability and runout analyses carried out in the Marina Piccola bay (Capri Island - Italy), an urban and touristic area sited at the foot of “Grotta delle Felci cliff” (a rocky slope 200 meters high and 300 meters wide). The integration among various types of survey and analysis methodologies allowed the application of a modern approach for the risk assessment that can be useful in the decision process concerning the choice of the most appropriate mitigation works. Regards to the survey techniques, terrestrial laser scanning and digital close-range photogrammetry were used to produce digital elevation models, oriented stereo-images, orthophotos and accurate positions and volumes of rocky wedges located on the slope overhanging the area.
Thanks to this data, the spatial distribution of rock fall density, velocities and kinetic energies was modeled by means of the “cone-method”. Rock falls historical evidences, recognized by the use of aerial photogrammetry and fieldwork activities, confirmed the accuracy of results obtained from the method application and allowed, through a further 2D rock fall runout analysis, the calculation of the dissipation energy that a protection work would need to mitigate the risk in the area
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