20.500.12556/RUL-151809 Measurements of complex free water surface topography using a photogrammetric method Meritve kompleksne topografije vodne gladine z uporabo fotorametrijske metode This paper presents a photogrammetry-based system for capturing turbulent aerated flow topography in a laboratory environment, especially for complex hydraulic phenomena character-ised by turbulent, non-stationary, and non-homogeneous aerated flows. It consists of ten high-resolution cameras equipped with monochromatic sensors and custom-built LED lights, all synchronised for accurate data acquisition. Post processing involves Structure-from-Motion and Multi-View Stereo techniques to calculate exterior and interior orientation parameters that ensure accurate alignment within a desired coordinate system, and conversion to point clouds. The proposed method showed great potential for capturing free water surface topography of turbulent aerated flows with high spatial and temporal resolution over the entire field of view of the cameras. Due to the unique capabilities of this system, direct comparisons with existing benchmarks were not possible. Instead, average free water surface profiles were derived from selected control cross sections, using 2D LIDAR measurements for verification. Both the LIDAR and photogrammetry averaged profiles showed remarkably good agreement, with deviations within ±20 mm. Validation showed that photogrammetry can be used to measure the complex aerated turbulent free water surface. In this way, this approach, involving consecutive image dataset acquisition at predefined intervals, is proving to be a valuable tool for observing, visualising, analysing, investigating, and gaining a comprehensive understanding of the dynamics of the free water surface. turbulent aerated flow free water surface topography non-intrusive measuring methods structure-from-motion turbulenten ozračeni tok topografija vodne gladine brezkontaktne merilne metode structure-from-motion dinamika voda true false true Angleški jezik Slovenski jezik Članek v reviji 2023-10-20 11:59:21 2023-10-20 11:59:25 2023-10-21 03:45:48 0000-00-00 00:00:00 2023 0 0 20 str. iss. 19, art. 4774 Vol. 15 2023 0000-00-00 PostprintKoncna Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 532:528.7 2072-4292 10.3390/rs15194774 166648579 remotesensing-15-04774-v2.pdf remotesensing-15-04774-v2.pdf 1 F47F225A223585ADA11FB94E3A3D6D7D cd7836ab376469472c41f898720e1c62a8bd3dabe4a569f5688d6dad0dd5c0d0 a73aecad-6f2f-11ee-b452-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=176876 https://www.mdpi.com/2072-4292/15/19/4774 1 5a32e8f2-6f2f-11ee-b452-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=176875 Fakulteta za gradbeništvo in geodezijo Fakulteta za strojništvo 0 0 0