Earth Surface Dynamics
Earth Surface Dynamics
ESurf
Articles | Volume 11, issue 4
Articles | Volume 11, issue 4
https://doi.org/10.5194/esurf-11-803-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/esurf-11-803-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 11, issue 4
Research article
 | 
15 Aug 2023
Research article |  | 15 Aug 2023

The probabilistic nature of dune collisions in 2D

Paul A. Jarvis, Clement Narteau, Olivier Rozier, and Nathalie M. Vriend

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Latest update: 24 Oct 2025
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Short summary
Sand dune migration velocity is inversely proportional to dune size. Consequently, smaller, faster dunes can collide with larger, slower downstream dunes. Such collisions can result in either coalescence or ejection, whereby the dunes exchange mass but remain separate. Our numerical simulations show that the outcome depends probabilistically on the dune size ratio, which we describe through an empirical function. Our numerical predictions compare favourably against experimental observations.
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