Bougouin Alexis auteur aut IRD Roche Olivier auteur aut IRD Paris R. auteur aut IRD Huppert H. E. auteur aut IRD text journalArticle eng text/pdf born digital access Granular 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 Earth's surface. To 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. The originality of this study lies in the fluidization process, which improves the laboratory modeling of geophysical flows by taking their high mobility into account. Qualitatively, 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. Hydrodynamic 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. The 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. Most currents propagate with a constant flow-front velocity along the horizontal bottom, which is controlled by the flow height depending on the water depth. In 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. This experimental study highlights the complexity of the dynamics and deposits of granular masses when they encounter a water body. specialized fluidization process geophysical flows granular media gravity currents laboratory experiments tsunamis 032 066 020 126 4 e2020JC016838 [22 p.] 2021 2169-9275 https://www.documentation.ird.fr/hor/fdi:010081469 10.1029/2020jc016838 2169-9275 [F B010081469] https://www.documentation.ird.fr/hor/fdi:010081469 https://www.documentation.ird.fr/intranet/publi/2021-06/010081469.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2021-06-15 2025-02-24 fdi:010081469 fre