UNIGE document Doctoral Thesis
previous document  unige:26675  next document
add to browser collection
Title

New numerical solutions for the description of volcanic particle dispersal

Author
Directors
Defense Thèse de doctorat : Univ. Genève, 2012 - Sc. 4521 - 2012/01/27
Abstract When volcanoes erupt explosively, particles are ejected and deposit on the ground. Numerical models for particle transports are important for both the hazard assessment and the eruptive dynamics. Total grainsize distributions are necessary for numerical simulations of particle transport. Comparing field data and numerical simulations, we show the representative sampling distance required to have reasonable grainsize distributions. Numerical models of tephra dispersal require better parameterizations. We have firstly developed 2D model with Cellular Automata (CA) method and expanded it to 3D. In our 3D model, diffusion is described with a random velocity corresponding fluctuations of turbulence. The implementation of plume significantly improves the description of particle distributions. Ballistic trajectories are modeled in 3D with a Discrete Event Simulation (DES) method. Multiparticle simulations are implemented including particle-particle collisions. We show the effect of collisions on travel distance. This model is applied to the hazard assessment of Vulcano Island (Italy).
Keywords Volcanoparticle transportcellular automataadvection-diffusionballisticsvolcanic hazards
Identifiers
URN: urn:nbn:ch:unige-266758
Full text
Thesis (10.7 MB) - public document Free access
Structures
Research group Physical Volcanology and Geological Risk
Citation
(ISO format)
TSUNEMATSU, Kae. New numerical solutions for the description of volcanic particle dispersal. Université de Genève. Thèse, 2012. https://archive-ouverte.unige.ch/unige:26675

472 hits

372 downloads

Update

Deposited on : 2013-03-11

Export document
Format :
Citation style :