Stochastic dynamics of snow avalanche occurrence by superposition of Poisson processes


Journal Article

We study the dynamics of systems with deterministic trajectories randomly forced by instantaneous discontinuous jumps occurring according to two different compound Poisson processes. One process, with constant frequency, causes instantaneous positive random increments, whereas the second process has a state-dependent frequency and describes negative jumps that force the system to restart from zero (renewal jumps). We obtain the probability distributions of the state variable and the magnitude and intertimes of the jumps to zero. This modelling framework is used to describe snow-depth dynamics on mountain hillsides, where the positive jumps represent snowfall events, whereas the jumps to zero describe avalanches. The probability distributions of snow depth, together with the statistics of avalanche magnitude and occurrence, are used to explain the correlation between avalanche occurrence and snowfall as a function of hydrologic, terrain slope and aspect parameters. This information is synthesized into a 'prediction entropy' function that gives the level of confidence of avalanche occurrence prediction in relation to terrain properties. © 2012 The Royal Society.

Full Text

Duke Authors

Cited Authors

  • Perona, P; Daly, E; Crouzy, B; Porporato, A

Published Date

  • December 8, 2012

Published In

Volume / Issue

  • 468 / 2148

Start / End Page

  • 4193 - 4208

Electronic International Standard Serial Number (EISSN)

  • 1471-2946

International Standard Serial Number (ISSN)

  • 1364-5021

Digital Object Identifier (DOI)

  • 10.1098/rspa.2012.0396

Citation Source

  • Scopus