Effects of pore pressure in pyroclastic flows : numerical simulation and experimental validation - Archive ouverte HAL Access content directly
Journal Articles Geophysical Research Letters Year : 2017

Effects of pore pressure in pyroclastic flows : numerical simulation and experimental validation

(1) , (1) , (1, 2) , (3)
1
2
3

Abstract

Pyroclastic flows are mixtures of volcanic gases and particles that can be very hazardous owing to their fluid-like behavior. One possible mechanism to explain this behavior is the reduction of particles friction due to the internal gas pore pressure. To verify this hypothesis, we present a numerical model of a granular flow with high initial pore pressure that decreases with time as the gas-particle mixture propagates. First, we validate the model by reproducing laboratory experiments. Then, the numerical code is applied to pyroclastic flows of Lascar volcano (1993 eruption, Chile). The simulation reproduces the runout and the morphological features of the deposits, with lateral levées, a central channel, and a lobate front. Our results support the hypothesis of the role of gas pore pressure in pyroclastic flows and explain both the fluid-like behavior of the flows and the formation of lateral levees.
Fichier principal
Vignette du fichier
Gueugneau_et_al-2017-Geophysical_Research_Letters.pdf (456.03 Ko) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

hal-01625001 , version 1 (20-12-2018)

Identifiers

Cite

V. Gueugneau, K. Kelfoun, Olivier Roche, L. Chupin. Effects of pore pressure in pyroclastic flows : numerical simulation and experimental validation. Geophysical Research Letters, 2017, 44 (5), pp.2194-2202. ⟨10.1002/2017GL072591⟩. ⟨hal-01625001⟩
209 View
284 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More