Preprints
https://doi.org/10.5194/esurf-2020-84
https://doi.org/10.5194/esurf-2020-84

  31 Oct 2020

31 Oct 2020

Review status: a revised version of this preprint was accepted for the journal ESurf and is expected to appear here in due course.

Particle size dynamics in abrading pebble populations

András A. Sipos1,2, Gábor Domokos1,2, and János Török1,3 András A. Sipos et al.
  • 1MTA-BME Morphodynamics Research Group Budapest University of Technology and Economics, Műegyetem rakpart 1-3, Budapest, Hungary
  • 2Department of Materials and Structures, Budapest University of Technology and Economics, Műegyetem rakpart 1-3, Budapest, Hungary
  • 3Department of Theoretical Physics, Budapest University of Technology and Economics, Budafoki út 8, Budapest, Hungary

Abstract. Abrasion of sedimentary particles in fluvial and aeolian environments is widely associated with collisions encountered by the particle. Although the physics of abrasion is complex, purely geometric models recover the course of mass and shape evolution of individual particles in low and middle energy environments (in the absence of fragmentation) remarkably well. In this paper, utilizing results of this individual, geometric abrasion theory as a collision kernel, following techniques adopted in the statistical theory of coagulation and fragmentation, we construct the corresponding Fokker-Planck equation as the first model for the collision-driven collective mass evolution of sedimentary particles. Our model uncovers a startling fundamental feature of collective particle size dynamics: collisional abrasion may, depending on the energy level, either focus size distributions, thus enhancing the effects of size selective transport or it may act in the opposite direction by dispersing the distribution. This complex behaviour fits geological observations on mass distributions.

András A. Sipos et al.

 
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Status: closed
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Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

András A. Sipos et al.

András A. Sipos et al.

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Short summary
Abrasion of sedimentary particles, is widely associated with mutual collisions. Utilizing results of individual, geometric abrasion theory, and techniques adopted in statistical physics, a new model for predicting the collective mass evolution of large number of particles is introduced. Our model uncovers a startling fundamental feature of collective particle dynamics: collisional abrasion may either focus size distributions or it may act in the opposite direction by dispersing the distribution.