Abstract
This paper describes the process of 3D analysis of two water currents with method of photogrammetry. Photogrammetry is used in fields such as architecture, engineering, police investigation, preserving cultural heritage, military and geology. This method can be used in military to reconstruct a site with traces of shrapnel or various projectiles. In our case we tried to measure height of turbulent flow, where two currents collided at the angle of 90°. In first section we introduce our problem and method. Second section describes method of photogrammetry and basics of torrential flows. In third section we describe our experiment. Fourth section describes the course of getting 3D model. In fifth section we analyze results and in sixth section, a conclusion is given.
Highlights
We found that the results were not accurate enough to determine the wave height or a more detailed analysis of the topographic structure, and that more accurate results would require a larger number of cameras to contribute to more images from several different angles
The Froud number allows to describe the ratio of inertia and gravity forces, and is used to describe and model the free-surface flow caused by the component of the force of gravity in the downstream direction
We have shown an example of calculating the Froud number in the main channel for the first scenario, for the other scenarios in the main channel and in the side channel the procedure is identical
Summary
With the existence of several types of measurement technologies and their increasing availability, approaches to measuring various phenomena in the living environment are changing. At the confluence of two free-surface currents with higher Reynolds and Froud numbers, quasi-stationary standing waves appear, the flow dynamics of which are very pronounced. In the past, these properties have been measured with tactile or pressure sensors, but they have limited temporal and spatial resolution. At a measuring station with two perpendicular currents, we recorded a quasi-standing wave with two high-speed cameras, and with the help of images we made a 3D model of the wave after their processing and determined its height. We found that the results were not accurate enough to determine the wave height or a more detailed analysis of the topographic structure, and that more accurate results would require a larger number of cameras to contribute to more images from several different angles
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
