RILIEVO DI UN EPHEMERAL GULLY NELL’AREA SPERIMENTALE DI SPARACIA MEDIANTE UNA TECNICA FOTOGRAFICA

Research output: Contribution to conferenceOther

Abstract

[automatically translated] In the memory are the results of applying a imagebased technique for monitoring an ephemeral gully formed in January 2015 in the experimental area of Sparacia. In the gully, 54 m long, 24 cross-sections have been identified that have been detected in the field by the use of a profilometer. The survey also involved the construction of a three-dimensional terrain model (DTM) obtained with the use of a large number of photographs of the same scene acquired from different viewpoints (Technique "Structure-From Motion" SFM and "Multi- View MVS-Stereo). The DTM three-dimensional (3D) and the 2.5D model extracted the profiles of the cross sections at both the 24 sections used in the field for the relief with a profilometer is of predetermined sections with a fixed spacing. Hired as a "reference" the 3D model were compared to the values of the geometrical and hydraulic characteristics, relating to 24 major sections, measured by the profilometer and extracted from the 2.5D model. The achievable accuracy in the estimation of these quantities can be compared and you commit, only in a limited number of cases, more than ± 10% errors. The report lunghezzavolume and that theoretically deduced on the basis of dimensional analysis, both obtained on the basis of measurements carried out with the profilometer and with the 2.5D and 3D methods, were comparable with the measures already available in the literature. Finally, using as a reference the values calculated with the 3D model,
Original languageItalian
Pages441-451
Number of pages11
Publication statusPublished - 2016

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