Laser ranging measurements of turbulent water surfaces

Rak, Gašper (author), Steinman, Franci (author), Hočevar, Marko (author), Dular, Matevž (author), Jezeršek, Matija (author), Pavlovčič, Urban (author)

Laser ranging is a measurement method, applied in a wide range of applications. In this study, laser ranging is used to measure the height of turbulent water flows. Measurements were performed in three cross sections of a confluence where a tributary flow meets the main flow. Both flows exhibited high Reynolds and Froude numbers where the free-water surface profiles were turbulent, non-stationary and non-homogeneous. Measurements were taken using a commercial LIDAR and a high-speed camera. The high-speed camera was operated on the principle of laser triangulation, using only the illumination from the LIDAR laser beam. Since, no other state-of-the-art method for measuring instantaneous water surface profiles exists, LIDAR and triangulation methods could only be compared with each other. The results show good agreement between both methods for the average turbulent water profile and fair agreement for instantaneous profiles. Presented herein is an explanation of these results.

• Language: English
• Keywords: hydrotechnics, LIDAR, laser triangulation, free surface, turbulence, non-stationary surface, high-speed camera
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FGG - Faculty of Civil and Geodetic Engineering; FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Author Accepted Manuscript
• Year: 2020
• Number of pages: Str. 165-172
• Numbering: Vol. 81
• PID: 20.500.12556/RUL-126448
• UDC: 626/627
• ISSN on article: 0997-7546
• DOI: 10.1016/j.euromechflu.2020.02.001
• COBISS.SI-ID: 9085793
• Publication date in RUL: 22.04.2021

Record is a part of a journal

• Title: European journal of mechanics. B, Fluids
• Shortened title: Eur. j. mech. B, Fluids
• Publisher: Elsevier
• ISSN: 0997-7546
• COBISS.SI-ID: 8129307

Licences

• License: CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
• Link: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Description: The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.

Secondary language

• Language: Slovenian
• Keywords: hidrotehnika, LIDAR, laserska triangulacija, prosta površina, turbulenca, nestacionarna površina, hitra kamera