Erosion-deposition dynamics and long distance propagation of granular avalanches

Edwards, Andrew; Viroulet, Sylvain; Johnson, Chris; Gray, J.O.

doi:10.1017/jfm.2021.34

Cited by 24 publications

(22 citation statements)

References 46 publications

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“…2019; Edwards et al. 2021). All of these features are captured by a depth-averaged avalanche model (2.1)–(2.2) that uses a non-monotonic hysteretic friction law (2.5)–(2.8) (Edwards et al.…”

Section: Discussionmentioning

confidence: 99%

“…2019; Edwards et al. 2021) that deposit adjacent to the levees, which themselves are well preserved in the deposit. The deposition sequence is particularly well captured in the three-dimensional thickness reconstruction movie in the online supplementary material.…”

Section: Numerical Simulations Of the Subcritical Flow And Depositmentioning

confidence: 97%

“…2017; Edwards et al. 2021) to hyperbolic-parabolic. The inclusion of the viscous terms is vital to properly model the formation of levees (Rocha et al.…”

Section: Governing Equationsmentioning

confidence: 99%

“…2019; Edwards et al. 2021). The final shape of the collapsed pile is much more rounded than that in the experiment, which maintains the flat top.…”

Section: Numerical Simulations Of the Supercritical Flow And Depositmentioning

confidence: 99%

“…2019; Edwards et al. 2021) can be quantitatively modelled with these rough-bed friction laws. Many of these problems require the additional inclusion of depth-averaged in-plane viscous terms in the avalanche equations (Gray & Edwards 2014; Baker et al.…”

Section: Introductionmentioning

confidence: 99%

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Subcritical and supercritical granular flow around an obstacle on a rough inclined plane

et al. 2021

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A blunt obstacle in the path of a rapid granular avalanche generates a bow shock (a jump in the avalanche thickness and velocity), a region of static grains upstream of the obstacle, and a grain-free region downstream. Here, it is shown that this interaction is qualitatively altered if the incline on which the avalanche is flowing is changed from smooth to rough. On a rough incline, the friction between the grains and the incline depends on the flow thickness and speed, which allows both rapid (supercritical) and slow (subcritical) steady uniform avalanches. For supercritical experimental flows, the material is diverted around a blunt obstacle by the formation of a bow shock and a static dead zone upstream of the obstacle. Downslope, a grain-free vacuum region forms, but, in contrast to flows on smooth beds, static levees form at the boundary between the vacuum region and the flow. In slower, subcritical, flows the flow is diverted smoothly around the dead zone and the obstacle without forming a bow shock. After the avalanche stops, signatures of the dead zone, levees and (in subcritical flows) a deeper region upslope of the obstacle are frozen into the deposit. To capture this behaviour, numerical simulations are performed with a depth-averaged avalanche model that includes frictional hysteresis and depth-averaged viscous terms, which are needed to accurately model the flowing and deposited regions. These results may be directly relevant to geophysical mass flows and snow avalanches, which flow over rough terrain and may impact barriers or other infrastructure.

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Section: Discussionmentioning

confidence: 99%

Section: Numerical Simulations Of the Subcritical Flow And Depositmentioning

confidence: 97%

“…2017; Edwards et al. 2021) to hyperbolic-parabolic. The inclusion of the viscous terms is vital to properly model the formation of levees (Rocha et al.…”

Section: Governing Equationsmentioning

confidence: 99%

“…2019; Edwards et al. 2021). The final shape of the collapsed pile is much more rounded than that in the experiment, which maintains the flat top.…”

Section: Numerical Simulations Of the Supercritical Flow And Depositmentioning

confidence: 99%