Fontanel, Gabriele (2018) Monitoraggio della subsidenza nell'area di bassa pianura compresa tra i fiumi Piave e Livenza attraverso tecniche di interferometria radar satellitare. [Magistrali biennali]
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In the first step of the work, the interferometric data of the ERS, ENVISAT, COSMO-SkyMed and SENTINEL missions have been collected at the CNR and at the University of Padua; then, a GIS project was created utilizing this information and the orthophotos downloaded from the geo-portal Regione Veneto concerning the area between S. Stino di Livenza and Eraclea. However, since the study area is too wide, we decided to study in detail only five areas of interest. For each area of interest, the interferometric data were compared with topographical, geological, geomorphological and land cover information in order to understand the real causes of the subsidence acting in the area and to monitor its evolution over time. Another interesting point of this work concerned the problem of the lack of Permanent Scatterers as it is a low urbanized area. To solve this critical issue, we acted as follows: we have seen how the RADAR data revealed the information in not studied areas, and how the signal reacted in areas where the geology was already known, then we compared the results. From this comparison it emerged that subsidence depends mainly on two factors: the geological nature of the soil and the imposition of punctual loads on it as buildings or infrastructures. Furthermore, it becomes clear that the main cause that triggers the subsidence is the construction or arrangement of these anthropogenic inputs. In fact, we observed an evident consolidation process during the comparison between orthophotos taken in successive times. These processes last on average for a few years and show a gradual slowdown towards the final phase. The duration of the phenomenon is strongly linked to the geological nature of the soil; this aspect is particularly evident where there are some textural variations in the territory such as the presence of a paleochannel filled by low consolidated sediments. The strength of this work lies in the synergy between the different techniques used to monitor subsidence. This aspect is of primary importance as it allows to overcome the gaps presented by the individual techniques, thus increasing the quality of the results.
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