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- W3100134472 abstract "We propose a mathematical model which suggests that the two main geological observations about shingle beaches, i.e. the emergence of predominant pebble size ratios and strong segregation by size, are interrelated. Our model is based on a system of ordinary differential equations (ODEs) called the box equations that describe the evolution of pebble ratios. We derive these ODEs as a heuristic approximation of Bloore's partial differential equation (PDE) describing collisional abrasion and verify them by simple experiments and by direct simulation of the PDE. Although representing a radical simplification of the latter, our system admits the inclusion of additional terms related to frictional abrasion. We show that non-trivial attractors (corresponding to predominant pebble size ratios) only exist in the presence of friction. By interpreting our equations as a Markov process, we illustrate by direct simulation that these attractors may only be stabilized by the ongoing segregation process." @default.
- W3100134472 created "2020-11-23" @default.
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- W3100134472 date "2012-05-09" @default.
- W3100134472 modified "2023-10-01" @default.
- W3100134472 title "The evolution of pebble size and shape in space and time" @default.
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- W3100134472 doi "https://doi.org/10.1098/rspa.2011.0562" @default.
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