Abstract
Abstract. Within this work the three dimensional development of a scour around a cylindrical bridge pier has been investigated experimentally. The erosion process has been surveyed in short time intervals using a photogrammetric approach. The results of the work give an unprecedented insight in the development of the scour geometry over time and therefore a crucial step to the fundamental understanding of the phenomena.
Highlights
The modelling of sediment transport in turbulent flows is rather complex and up to now there is no general approach available to predict such phenomena
The exterior orientation was reconstructed using the ground control points established on top of the acrylic glass plate, to ensure that there is no displacement of the image ray by acrylic glass and water
The selected image pairs where imported into the Leica Photogrammetry Suite (LPS) and assigned with the exterior orientation from the 0-state image pair
Summary
The modelling of sediment transport in turbulent flows is rather complex and up to now there is no general approach available to predict such phenomena. Scours develop when structures deflect the stream in such a way that the instantaneous velocities and pressures lead to a lift force that acts onto certain grains. These corns are transported and sediment in the wake of the structure. The sediment transport begins as the logarithmic velocity profile of the approaching flow induces a vertical pressure gradient that leads to a down-flow in the vicinity of the pier. This downflow is being deflected and due to the tangential velocity component transported around the cylinder (Pfleger 2011). The photogrammetric approach that has been developed within this work gives a first but in time and space resolved insight into the whole scour geometry which leads to a deeper understanding of such phenomena
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 callMore From: The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
Disclaimer: 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.
