Rarefied particle motions on hillslopes – Part 2: Analysis

Abstract. We examine a theoretical formulation of the probabilistic physics rarefied particle motions and deposition on rough hillslope surfaces using measurements travel distances obtained from laboratory field-based experiments, supplemented with high-speed imaging audio recordings that highlight effects particle–surface collisions. The formulation, presented in companion paper (Furbish et al., 2021a), is based description kinetic energy balance cohort particles treated as granular gas, well depends state particles. Both are consistent generalized Pareto distribution predicted variations behavior associated between gravitational heating due to conversion potential frictional cooling For given size shape these behaviors vary bounded representing rapid thermal collapse small slopes or large surface roughness, an exponential approximately isothermal conditions, heavy-tailed net slopes. transition likely involves increasing translational rotational leading larger decreasing effectiveness collisional friction. This strongly influenced by shape, although analysis points need for further clarity concerning how concert roughness influence extraction likelihood deposition.