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Experimental and numerical study of long runout landslides

Objective

Landslides, the violent motion of large masses of debris, rock or snow, are an ever-present danger in mountainous regions the world over. After the landslide material falls down the mountainside, it will run out some distance away from the mountain even on relatively flat surfaces until the energy it gained from falling is dissipated by friction with the terrain. Although a simple energy balance argument suggests that a single rock cannot travel farther than the height from which it fell, many landslide runouts extend their ruin to seemingly safe distances far removed from their origin. These long runout landslides have baffled scientists for over a century, ever since Albert Heim recorded his study of the Elm rock landslide that devastated the village of Elm, Switzerland in 1881. There are many explanations for this phenomenon, such as lubrication by an interstitial fluid, but none of these satisfactorily addresses how a completely dry landslide can run out so far. Not understanding how and when long runouts will occur makes hazard mitigation and prediction extremely difficult, highlighting the urgency of this issue. Recently, Melosh and coworkers have provided support for a mechanism borrowed from the fluidization of impact craters, “acoustic fluidization”, by using idealized 2D simulations of circular disks, but more work is needed to show that this mechanism is a feature of real 3D flows and robust for a range of conditions. We will perform laboratory experiments and fully 3D simulations of granular flows using simultaneous pressure and velocity measurements to test the acoustic fluidization hypothesis. We will also look for a crossover between this dry mechanism and the lubrication mechanisms for wet landslides. Besides application to landslide engineering, we will also explore for the first time how fundamental features of granular flows such as shear flow instabilities (clustering and longitudinal stripes) affect the rheology of landslides and long runouts.
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Coordinator

UNIVERSITE DE BORDEAUX

Address

Place Pey Berland 35
33000 Bordeaux

France

Activity type

Higher or Secondary Education Establishments

EU Contribution

€ 196 707,84

Project information

Grant agreement ID: 835574

Status

Grant agreement signed

  • Start date

    15 January 2020

  • End date

    14 January 2022

Funded under:

H2020-EU.1.3.2.

  • Overall budget:

    € 196 707,84

  • EU contribution

    € 196 707,84

Coordinated by:

UNIVERSITE DE BORDEAUX

France