@article{fdi:010065423,
  title = {{I}nfluence of slope angle on pore pressure generation and kinematics of pyroclastic flows : insights from laboratory experiments},
  author = {{C}hedeville, {C}. and {R}oche, {O}livier},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he influence of slope angle on pore pressure generation and kinematics of fines-rich pyroclastic flows was investigated through laboratory experiments. {G}ranular flows were generated by the release of a column of fine glass beads (d=0.08 mm) in an inclined channel (0-30 degrees). {T}he granular column could be fluidized while the channel base was either smooth or made rough by glued beads of 3 mm diameter. {P}ore pressure measurements reveal that the degree of autofluidization, caused by air escaping from the substrate interstices into which flow particles settled, was high at all slope angles. {F}low runout increase due to autofluidization, however, was reduced at slope angle higher than similar to 12 degrees because of the occurrence of a strong deceleration phase that limited the flow duration. {T}his is probably caused by the combination of flow head thinning at increased slope angle and settling of particles into the substrate interstices until the flow ran out of mass. {A}nalysis of high-speed videos suggests that ingestion of ambient air at the flow front did not occur, even on steep slopes of 30 degrees. {E}xperiments at inclinations close to (25 degrees) or slightly higher (30 degrees) than the repose angle of the granular material (28.5 degrees) revealed the formation of a thin basal deposit that was then eroded as the flow thickness and velocity gradually decreased. {O}ur study suggests that air escape from substrate interstices in nature can be a significant external cause of pore pressure generation that favors low energy dissipation and long runout distances of pyroclastic flows on moderate topographies.},
  keywords = {{P}yroclastic flows ; {F}luidization ; {P}ore pressure ; {A}nalog modelling ; {I}nclined substrate ; {S}ubstrate roughness},
  booktitle = {},
  journal = {{B}ulletin of {V}olcanology},
  volume = {77},
  numero = {11},
  pages = {art. 96 [13 p.]},
  ISSN = {0258-8900},
  year = {2015},
  DOI = {10.1007/s00445-015-0981-4},
  URL = {https://www.documentation.ird.fr/hor/fdi:010065423},
}