Premium
A mixture of crushing and segregation: The complexity of grainsize in natural granular flows
Author(s) -
Marks Benjy,
Einav Itai
Publication year - 2015
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2014gl062470
Subject(s) - geology , debris , pyroclastic rock , granular material , power law , log normal distribution , mixing (physics) , statistical physics , mechanics , geotechnical engineering , volcano , physics , geochemistry , mathematics , oceanography , statistics , quantum mechanics
The interplay between grain crushing and segregation controls the dynamics of dense granular flows that underpin many natural hazards. We address this issue for the first time by developing a simple lattice model with three interacting rules—for grain crushing, mixing, and segregation. In earthquake faults, particles are trapped, they crush and mix, but do not segregate. In this case the model produces power law distributions, consistent with previous models. When segregation by kinetic sieving is added to the model, we predict depth‐dependent lognormal distributions as previously observed, but not explained, in pyroclastic flows, debris flows, rock avalanches, and dry snow avalanches.