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• W2555751512 abstract "The work is inserted in an ongoing experimental researchdirected to describe, with photogrammetric techniques the surface evolution of granular masses moving down a slope. The obtained experimental data, derived from time evolution of the fluxes, can contribute to the description of the rheology and to the calibration of physical-mathematical-numerical models, aimed to improve the understanding of dry and wet granular phenomena: dense snow avalanches, rock avalanches, debris flows. The experimental apparatus is equipped with a system for fast image acquisition from eight digital cameras. The synchronization of the frames has been obtained a National Instrument hardware control system and a proper software written in LabView. The image transfer velocity was optimized using Raid technology. The system developed at the laboratory will be soon applied in a debris flow site (Acquabona, Belluno Province, Italy), where a new monitoring system has been recently. Full Report – laboratory activity The calibration of physical-mathematical-numerical models, that try to simulate the dynamics of wet and dry granular masses, is carried by physical models based on the similarity theory, together with the direct observation on the field. Numerical models are widely used in the process of definition of hazard maps of several phenomena: among them dense snow avalanches, rock avalanches and debris flows. In order to provide new experimental data useful for the calibration of numerical models and to test rheological laws, an experimental apparatus has been built at the Geosciences Department. The apparatus has the purpose of reproducing, three-dimensionally, the outer surface of a moving granular mass from the initiation to the end of motion. The technique that we have chosen to fulfil the goal is the photogrammetry, also considering the relatively low cost of the necessary equipment and the possibility of application in the field. As a final product of the research we expect to realize a procedure, as automatic as possible, able to describe, moment by moment, the three-dimensional distribution of the granular mass, to define the precision of the obtained topographic data and to establish the limits of the technique. An experimental flume, consisting of two planes with adjustable inclination, has been used. The upstream plane, with slope ranging from 15% to 60%, simulates the flowing zone and the downstream plane, with slopes ranging from 0% to 30%, simulates the deposition area. The experiments are being performed using a maximum of eight industrial non metric digital videocameras. A full photogrammetric camera calibration process has been first conducted to define the parameters of inner orientation of the cameras and of the objective lenses distortion, in order to reduce the uncertainties in the collinearity equations. The recording time is digitally triggered at the same time for all the cameras. A dedicated acquisition code, based on LabView software, has been realized to achieve the best accuracy in the frames synchronization. The surface is reconstructed, at different times, using the frames taken at the same instant from the different video-cameras." @default.
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• W2555751512 date "2012-01-01" @default.
• W2555751512 modified "2023-09-23" @default.
• W2555751512 title "GRANULAR FLUXES IN LABORATORY AND IN THE FIELD: 3-DIMENSIONAL SURVEY BY TERRESTRIAL PHOTOGRAMMETRIC TECHNIQUES" @default.
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