@article{fdi:010081469,
  title = {{E}xperimental insights on the propagation of fine-grained geophysical flows entering water},
  author = {{B}ougouin, {A}lexis and {R}oche, {O}livier and {P}aris, {R}. and {H}uppert, {H}. {E}.},
  editor = {},
  language = {{ENG}},
  abstract = {{G}ranular flows that propagate down a mountainside, then reach the sea, a lake or a river and finally, travel underwater, is a common event on the {E}arth's surface. {T}o help the description of such events, laboratory experiments on gas-fluidized granular flows entering water are performed, analyzed, and compared to those propagating in air. {T}he originality of this study lies in the fluidization process, which improves the laboratory modeling of geophysical flows by taking their high mobility into account. {Q}ualitatively, the presence of the water body promotes the generation of a granular jet over the water surface, a leading and largest wave, and a particle-driven gravity current underwater. {H}ydrodynamic forces mainly play a dissipative role by slowing and reducing the spreading of the granular mass underwater, but a low amount of grains are still transported by the turbulent fluid as a gravity current far away. {T}he temporal evolution of the granular jet and the particle-driven gravity current are well described by ballistic motion theory and scaling laws of homogeneous gravity currents, respectively. {M}ost currents propagate with a constant flow-front velocity along the horizontal bottom, which is controlled by the flow height depending on the water depth. {I}n contrast, the bulk volume concentration of particles in the current is estimated to be nearly constant, interpreted as a critical concentration above which the excess of particles cannot be maintained by the turbulent fluid. {T}his experimental study highlights the complexity of the dynamics and deposits of granular masses when they encounter a water body.},
  keywords = {fluidization process ; geophysical flows ; granular media ; gravity ; currents ; laboratory experiments ; tsunamis},
  booktitle = {},
  journal = {{J}ournal of {G}eophysical {R}esearch : {O}ceans},
  volume = {126},
  numero = {4},
  pages = {e2020{JC}016838 [22 p.]},
  ISSN = {2169-9275},
  year = {2021},
  DOI = {10.1029/2020jc016838},
  URL = {https://www.documentation.ird.fr/hor/fdi:010081469},
}