HR: 0800h
AN: V51C-0715    [Abstracts]
TI: 2D Lattice Boltzmann conduction-advection model with phase-change: Developing a new tool to assess melting/crystallization dynamics in magma chamber.
AU: Bachmann, O
EM: bachmano@u.washington.edu
AF: University of Washington, Dept. of Earth and Space Sciences, Box 351310, Seattle, WA 98195-1310, United States
AU: * Parmigiani, A
EM: andrea.parmigiani@terre.unige.ch
AF: University of Geneva, Computer Science Department, Battelle bâtiment A, 7, route de Drize, Carouge, 1227, Switzerland
AU: Huber, C
EM: chuber@seismo.berkeley.edu
AF: University of California Berkeley, Dept. of Earth and Planetary Science, 307 McCone Hall #4767, Berkeley, CA 94720-4767, United States
AU: Chopard, B
EM: bastien.chopard@cui.unige.ch
AF: University of Geneva, Computer Science Department, Battelle bâtiment A, 7, route de Drize, Carouge, 1227, Switzerland
AB: As the crystallinity of erupted volcanic deposits never exceeds ~50 volume %, a fundamental parameter for the prediction of volcanic risks is the evolution of the crystal fraction in a given magma reservoir. In such reservoirs, crystallinity varies in a non-linear way as a function of (1) exchange of heat with its surrounding (both addition of heat by magma recharge and loss through wall rocks), (2) convection-advection dynamics (silicate melt and gas flow in the reservoir) and (3) phase changes (melting/crystallization exsolution/dissolution). To better understand magmatic systems, the effects of all these parameters should be taken into account (multi- physics, multi-scale problem). Our goal is to develop a flexible numerical tool based on the Lattice Boltzmann method that is able to deal with complex interactions of the above cited phenomena. In this poster, we present the step by step development of our code and show tests of its efficiency on different volcanological cases. We are particularly interested in large silicic systems leading to caldera-forming eruptions.
DE: 1036 Magma chamber processes (3618)
DE: 2753 Numerical modeling
DE: 8414 Eruption mechanisms and flow emplacement
DE: 8439 Physics and chemistry of magma bodies
DE: 8488 Volcanic hazards and risks
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2007 Fall Meeting