Ranging of Turbulent Water Surfaces Using a Laser Triangulation Principle in a Laboratory Environment
Publication: Journal of Hydraulic Engineering
Volume 146, Issue 8
Abstract
A measuring system based on laser triangulation for ranging a turbulent water surface in a laboratory environment is presented in this paper. The system is composed of a light detection and ranging (LIDAR) device, serving as a light source, and a high-speed camera. Single-point illumination was chosen to facilitate the introduction of the epipolar line in the image-processing step and thus improve the distinction between primary and other reflections, which increase the uncertainty of the measurement and introduce noise. The system was used to measure the water surface in an open channel confluence, which is composed of main and tributary channels, which join at a 90° angle. The surface was measured for 2.01 s, resulting in 54,682 points measured in 543 profiles. The influence of image process parameters (height and width of filtering kernel and width of area surrounding the epipolar line) on smooth and rough water surface was studied. The results show that the parameters’ influence is at least an order of magnitude smaller than the amplitude of water surface fluctuation.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request. These data include high-speed camera video, and code for image processing and surface reconstruction.
Acknowledgments
We thank the Research agency of Slovenia ARRS for the support of this research through programs P2-0167, P2-0180, and P2-0270.
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Published In
Journal of Hydraulic Engineering
Volume 146 • Issue 8 • August 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Jun 14, 2019
Accepted: Feb 6, 2020
Published online: May 20, 2020
Published in print: Aug 1, 2020
Discussion open until: Oct 20, 2020
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