Relation between dry granular flow regimes and morphology of deposits: formation of levées in pyroclastic deposits

By G. Félix, N. Thomas. 2003

153 citations recorded by the source corpus.

Experiments on dry granular matter flowing down an inclined plane are performed in order to study the dynamics of dense pyroclastic flows. The plane is rough, and always wider than the flow, focusing this study on the case of laterally unconfined (free boundary) flows. We found that several flow regimes exist depending on the input flux and on the inclination of the plane. Each flow regime corresponds to a particular morphology of the associated deposit. In one of these regimes, the flow reaches a steady state, and the deposit exhibits a levee/channel morphology similar to those observed on small pyroclastic flow deposits. The levees result from the combination between lateral static zones on each border of the flow and the drainage of the central part of the flow after the supply stops. Particle segregation features are created during the flow, corresponding to those observed on the deposits of pyroclastic flows. Moreover, the measurements of the deposit morphology (thickness of the channel, height of the levees, width of the deposit) are quantitatively related to parameters of the dynamics of the flow (flux, velocity, height of the flow), leading to a way of studying the flow dynamics from only measurements of the deposit. Some attempts to make extensions to natural cases are discussed through experiments introducing the polydispersity of the particle sizes and the particle segregation process.

Subfields: Computational Mechanics, Management, Monitoring, Policy and Law, Ocean Engineering

View Paper: https://www.semanticscholar.org/paper/b21b6eaa7b2c0c3b50f4da692bc8b71bc2e203f2

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Citations in the corpus

On the use of Saint Venant equations to simulate the spreading of a granular mass (2005, background): “[4] Dense dry granular flows along inclined planes have been shown to exhibit a number of characteristics of natural gravitational flows [e.g., Felix and Thomas, 2004; Iverson, 1997; Denlinger and Iverson, 2001] and have been thoroughly investigated [Gray et al., 1999; Pouliquen, 1999; Pouliquen…”
Dense flows of cohesive granular materials (2008, unknown): “…transport of minerals, cereals or powders (Rietema 1991), or in geophysical applications: rock falls, landslides (Campbell, Cleary & Hopkins 1995), pyroclastic flows (Félix & Thomas 2004) and snow avalanches (Bouchet et al. 2003; Rognon et al. 2007) involve large-scale flows of particulate solids.”
Multi-component particle-size segregation in shallow granular avalanches (2011, background): “…(Gray & Ancey 2009; Gray & Kokelaar 2010a , b), lateral levees and digitate lobate terminations (Pierson 1986; Pouliquen et al. 1997; Pouliquen & Vallance 1999; Iverson & Vallance 2001; Félix & Thomas 2004; Goujon, Dalloz-Dubrujeaud & Thomas 2007; Cagnoli & Romano 2010; Iverson et al. 2010).”
Grain-size segregation and levee formation in geophysical mass flows (2012, background): “coarse-particle levees in debris flows, pyroclastic density currents [Branney and Kokelaar, 2002; Félix and Thomas, 2004] and snow avalanches [Gray and Kokelaar, 2010a,”
Flows of Dense Granular Media (2008, background): “…have been analyzed, such as dam-break problems (Lajeunesse et al. 2004, Lube et al. 2004), coating-like problems (Deboeuf et al. 2006, Felix & Thomas 2004), mixing experiments (Ottino & Khakhar 2000), split Couette devices (Fenistein et al. 2004), drag problems (Hill et al. 2005),…”
Plasticity and geophysical flows: A review (2007, background): “Note the levee formation is probably ot induced by particle segregation since it is also observed for ry granular flows involving spherical equal-size particles [90].”
Segregation, recirculation and deposition of coarse particles near two-dimensional avalanche fronts (2009, background): “Large- and small-particle recirculation Large grains have been observed to recirculate at coarse-particle-rich flow fronts (Pouliquen et al. 1997; Félix & Thomas 2004), and this plays a key part in the development of frontal instabilities (Pouliquen & Vallance 1999) and levee formation in…”
Particle Segregation in Dense Granular Flows (2018, background): “For a bidisperse mixture of grains, Félix & Thomas (2004) found that this morphology was strongly enhanced, with the central channel almost completely drained at the end.”