Žan Pleterski (Author), Marko Hočevar (Author), Benjamin Bizjan (Author), Sabina Kolbl (Author), Gašper Rak (Author)

Abstract

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.

Keywords

turbulenten ozračeni tok;topografija vodne gladine;brezkontaktne merilne metode;structure-from-motion;dinamika voda;turbulent aerated flow;free water surface topography;non-intrusive measuring methods;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FGG - Faculty of Civil and Geodetic Engineering
UDC: 532:528.7
COBISS: 166648579 Link will open in a new window
ISSN: 2072-4292
Views: 17
Downloads: 6
Average score: 0 (0 votes)
Metadata: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Other data

Secondary language: Slovenian
Secondary title: Meritve kompleksne topografije vodne gladine z uporabo fotorametrijske metode
Secondary keywords: turbulenten ozračeni tok;topografija vodne gladine;brezkontaktne merilne metode;structure-from-motion;dinamika voda;
Type (COBISS): Article
Pages: 20 str.
Volume: ǂVol. ǂ15
Issue: ǂiss. ǂ19, [article no.] 4774
Chronology: 2023
DOI: 10.3390/rs15194774
ID: 20386145