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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 2, issue 3/4
Nat. Hazards Earth Syst. Sci., 2, 181–185, 2002
https://doi.org/10.5194/nhess-2-181-2002
© Author(s) 2002. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

Special issue: Landslides and related phenomena: Avalanches

Nat. Hazards Earth Syst. Sci., 2, 181–185, 2002
https://doi.org/10.5194/nhess-2-181-2002
© Author(s) 2002. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

  31 Dec 2002

31 Dec 2002

An experimental study of particle-driven gravity currents on steep slopes with entrainment of particles

M. Rastello1, C. Ancey1, F. Ousset1, R. Magnard1, and E. J. Hopfinger2 M. Rastello et al.
  • 1Cemagref, u.r. etna, 2 rue de la papeterie, BP 76, F-38402 Saint Martin d’Hères, France
  • 2Legi, 1025 rue de la Piscine, BP 53, F-38041 Grenoble Cedex, France

Abstract. Results of laboratory experiments are presented in which a finite suspension of sawdust particles was released instantaneously into a rectangular channel immersed in a water tank. Two kinds of gravity currents were studied: currents with or without entrainment of particles from the bed. Experiments were repeated for two slopes: 30° and 45°. We observed that the velocity of the front was significantly in-creased as particle entrainment occurred. In addition, our experiments showed that the front kept a quasi-constant velocity for both runs. This might suggest that the flow regime corresponded to the "slumping regime" or "adjustment phase" described earlier by Huppert and Simpson (1980).

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