Articles | Volume 13, issue 4
https://doi.org/10.5194/esurf-13-607-2025
https://doi.org/10.5194/esurf-13-607-2025
Research article
 | 
22 Jul 2025
Research article |  | 22 Jul 2025

Surface grain-size mapping of braided channels from SfM photogrammetry

Loïs Ribet, Frédéric Liébault, Laurent Borgniet, Michaël Deschâtres, and Gabriel Melun

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Cited articles

Adams, J.: Gravel Size Analysis from Photographs, J. Hydraul. Div., 105, 1247–1255, https://doi.org/10.1061/JYCEAJ.0005283, 1979. 
Ashmore, P.: 9.17 Morphology and Dynamics of Braided Rivers, in: Treatise on Geomorphology, edited by: Shroder, J. F. and Wohl, E., Elsevier, 289–312, https://doi.org/10.1016/B978-0-12-374739-6.00242-6, 2013. 
Ashmore, P. E.: Laboratory modelling of gravel braided stream morphology, Earth Surf. Proc. Land., 7, 201–225, https://doi.org/10.1002/esp.3290070301, 1982. 
Barnard, P. L., Rubin, D. M., Harney, J., and Mustain, N.: Field test comparison of an autocorrelation technique for determining grain size using a digital 'beachball' camera versus traditional methods, Sediment. Geol., 201, 180–195, https://doi.org/10.1016/j.sedgeo.2007.05.016, 2007. 
Bluck, B. J.: 18.–Sedimentation in some Scottish Rivers of Low Sinuosity, Earth Env. Sci. T. R. So., 69, 425–456, https://doi.org/10.1017/S0080456800015416, 1976. 
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This work presents a protocol and a model to obtain the sizes of the pebbles in mountain rivers from uncrewed aerial vehicle images. A total of 12 rivers located in southeastern France were photographed to build the model. The results show that the model has little error and should be usable for similar rivers. The grain size of mountain rivers is an important parameter for environmental diagnostics by mapping the aquatic habitats and for flood management by estimating the pebble fluxes during floods.
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