@article{fdi:010086822,
  title = {{P}yro{CLAST} : a new experimental framework to investigate overspilling of channelized, concentrated pyroclastic currents},
  author = {{G}ueugneau, {V}. and {C}harbonnier, {S}. and {R}oche, {O}livier},
  editor = {},
  language = {{ENG}},
  abstract = {{S}mall-volume concentrated pyroclastic currents ({CPC}s) are often responsible for unpredicted and deadly overspills from channel confines when they encounter an abrupt change in propagation direction. {W}e present the first results obtained with a new experimental facility, {P}yro{CLAST}, built to investigate the mechanisms of such overspills. {T}he apparatus consists of a 5-m-long flume with a 45(?)degrees valley bend at mid-distance from the source, and whose slope angle varies from 3 to 15(?)degrees. {G}lass beads of 45-90-mu m diameter are initially fluidized in a reservoir and rapidly released into the flume through a vertical sliding gate. {E}xperiments are recorded using video cameras to measure the temporal evolution of both the parent channelized and overbank flow velocity and discharge rate, using particle image velocimetry. {O}verspills are generated when the flows interact with the bend, at slope angles of 9 to 15(?)degrees, generating a front splash and an overbank flow. {R}esults demonstrate that the slope angle favors the formation of overspill by increasing the flow discharge rate, causing a local increase of the flow thickness along the bend (i.e., superelevation) that overtops the channel sidewall. {M}oreover, under constant initial conditions, a high channel slope angle and discharge rate favor the development of discrete, internal flow pulses, and a positive correlation is found between the runout of the channelized flows and that of overbank deposits. {D}ata collected in this study will also constitute a reference dataset for future benchmarking of {CPC} numerical models.},
  keywords = {{P}yroclastic currents ; {E}xperimental framework ; {O}verspilling phenomenon},
  booktitle = {},
  journal = {{B}ulletin of {V}olcanology},
  volume = {85},
  numero = {1},
  pages = {5 [17 p.]},
  ISSN = {0258-8900},
  year = {2022},
  DOI = {10.1007/s00445-022-01623-y},
  URL = {https://www.documentation.ird.fr/hor/fdi:010086822},
}