Particle size dynamics in abrading pebble populations

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