Publications des scientifiques de l'IRD

Gueugneau V., Kelfoun K., Roche Olivier, Chupin L. (2017). Effects of pore pressure in pyroclastic flows : numerical simulation and experimental validation. Geophysical Research Letters, 44 (5), p. 2194-2202. ISSN 0094-8276.

Titre du document
Effects of pore pressure in pyroclastic flows : numerical simulation and experimental validation
Année de publication
2017
Type de document
Article référencé dans le Web of Science WOS:000398183700017
Auteurs
Gueugneau V., Kelfoun K., Roche Olivier, Chupin L.
Source
Geophysical Research Letters, 2017, 44 (5), p. 2194-2202 ISSN 0094-8276
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 levees, 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.
Plan de classement
Géologie et formations superficielles [064] ; Géophysique interne [066]
Localisation
Fonds IRD [F B010069368]
Identifiant IRD
fdi:010069368
Contact