Journal
ACTA GEOPHYSICA
Volume 70, Issue 5, Pages 2341-2360Publisher
SPRINGER INT PUBL AG
DOI: 10.1007/s11600-022-00791-x
Keywords
Bedload transport; Image processing; Statistical Background Model; Large-Scale Particle Image Velocimetry; Video-based Bedload Tracker
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Funding
- Budapest University of Technology and Economics
- New National Excellence Program of the Ministry for Innovation and Technology [UNKP-20-3, UNKP-21-4]
- National Research, Development and Innovation Fund, Hungary
- Bolyai Janos fellowship of the Hungarian Academy of Sciences
- NRDI Fund [TKP2021]
- Ministry for Innovation and Technology [BME-NVA-02]
- OTKA FK Grant [128429]
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This study introduces a novel image-based method, the Video-based Bedload Tracker (VBT), for quantifying gravel bedload transport. By combining two different techniques, VBT provides detailed statistics of individual particle velocity and size data. The method has been tested and found to be able to set the correct parameter values easily through visual evaluation and literature. The applicability of VBT in the field is discussed, and a statistical filter is provided to account for suspended sediment and air bubbles.
Bedload transport is an important factor to describe the hydromorphological processes of fluvial systems. However, conventional bedload sampling methods have large uncertainty, making it harder to understand this notoriously complex phenomenon. In this study, a novel, image-based approach, the Video-based Bedload Tracker (VBT), is implemented to quantify gravel bedload transport by combining two different techniques: Statistical Background Model and Large-Scale Particle Image Velocimetry. For testing purposes, we use underwater videos, captured in a laboratory flume, with future field adaptation as an overall goal. VBT offers a full statistics of the individual velocity and grainsize data for the moving particles. The paper introduces the testing of the method which requires minimal preprocessing (a simple and quick 2D Gaussian filter) to retrieve and calculate bedload transport rate. A detailed sensitivity analysis is also carried out to introduce the parameters of the method, during which it was found that by simply relying on literature and the visual evaluation of the resulting segmented videos, it is simple to set them to the correct values. Practical aspects of the applicability of VBT in the field are also discussed and a statistical filter, accounting for the suspended sediment and air bubbles, is provided.
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