Roughness analysis of the riverbed in the study of torrential events using terrestrial photogrammetry data
Résumé
This study examines the riverbed in the lower course of the Damdere River in the Eastern Rhodope Mountains (southern Bulgaria), a region prone to torrential flow events. Two field campaigns were carried out – in October 2023 and October 2024, employing terrestrial photogrammetry to generate high-resolution 3D point clouds for the computation of geometric features of the riverbed. Using CloudCompare open source software, roughness values were calculated from the photogrammetric data and compared with manually measured sediment “b” axis values. Results show that maximum roughness values were higher in 2024, but more significant spatial variability of the roughness across the test site is observed at the 3D point cloud of 2023, likely reflecting sediment transport due to torrential flows. These findings suggest that in the absence of rain gauges, sediment size, and roughness data serve as viable indicators of torrential activity, with local rainfall patterns supporting erosion and sediment displacement.
Domaines
Sciences de la TerreOrigine | Fichiers éditeurs autorisés sur une archive ouverte |
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