Articles | Volume 11, issue 1
Research article
19 Jan 2023
Research article |  | 19 Jan 2023

Entrainment and deposition of boulders in a gravel bed river

Pascal Allemand, Eric Lajeunesse, Olivier Devauchelle, and Vincent J. Langlois

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Cited articles

Abramian, A., Devauchelle, O., and Lajeunesse, E.: Laboratory rivers adjust their shape to sediment transport, Phys. Rev. E, 102, 053101,, 2020. 
Allemand, P.: Entrainment and deposition of boulders in a gravel bed river, Harvard Dataverse [data set],, 2021. 
Allemand, P., Delacourt, C., Lajeunesse, E., Devauchel, O., and Beauducel, F.: Erosive effects of the storm Helena (1963) on Basse Terre Island (Guadeloupe – Lesser Antilles Arc), Geomorphology, 206, 79–86,, 2014. 
Ancey, C.: Stochastic modeling in sediment dynamics: Exner equation for planar bed incipient bed load transport conditions., J. Geophys. Res.-Earth, 115, F00A11,, 2010. 
Ancey, C., Davison, A., Bohm, T., Jodeau, M., and Frey, P.: Entrainment and motion of coarse particles in a shallow water stream down a steep slope, J. Fluid Mech., 595, 83–114,, 2008.  
Short summary
We recorded yearly images of a bar of the Vieux-Habitants river, a river located on Basse-Terre (Guadeloupe). These images, combined with measurements of the river discharge, allow us to monitor the evolution of the population of boulders. We estimate the smallest discharge that can move the boulders and calculate the effective transport time. We show that the likelihood of a given boulder remaining at the same location decreases exponentially, with an effective residence time of 17 h.