Particle interaction inside debris flows: Evidence through experimental data and quantitative clast shape analysis

Caballero, Lizeth; Sarocchi, Damiano; Borselli, L.; Cárdenas, Antonio

doi:10.1016/j.jvolgeores.2012.04.007

Cited by 25 publications

(21 citation statements)

References 32 publications

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“…It builds on the previous findings of Caballero et al [2012] but goes beyond this previous work by proposing a general model of fragmentation. It presents new evidence about the strong influence of fragmentation on debris flow dynamics.…”

Section: Introductionmentioning

confidence: 75%

“…In this work, we present experimental evidence of a fragmentation process that occurs in debris flows as the result of strong clast interactions. It builds on the previous findings of Caballero et al [2012] but goes beyond this previous work by proposing a general model of fragmentation. It presents new evidence about the strong influence of fragmentation on debris flow dynamics.…”

Section: Introductionmentioning

confidence: 75%

“…Sodium bentonite was chosen because it is one of the most Journal of Geophysical Research: Earth Surface 10.1002/2013JF002942 reactive clays. This characteristic allows the influence of clay on the matrix behavior of the mixtures to be observed [Caballero et al, 2012].…”

Section: Methodsmentioning

confidence: 99%

“…Clast morphology evolution in sediment-water mixtures is explained in detail in Caballero et al [2012]. In this work we use some of their results to give extrasupport to the conclusions of this paper, which are treated in the discussion section.…”

Section: Clast Morphologymentioning

confidence: 99%

“…Experimentally, Caballero et al [2012] described fracturing and comminution in debris flows based on quantitative morphologic analysis. Data reported suggest that morphologic evolution within debris flows depends on particle size.…”

Section: Introductionmentioning

confidence: 99%

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Rheological changes induced by clast fragmentation in debris flows

Caballero¹,

Sarocchi

Ortega³

et al. 2014

JGR Earth Surface

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On the basis of rotating drum analogue experiments, we describe a fragmentation process acting within debris flows during transport and its influence on rheologic behavior. Our hypothesis is based on a detailed textural analysis including granulometry, clast morphology, and rheologic properties of the fluid matrix. Results of the experiments point out that breakage of certain granulometric classes produces fine particles like fine sand and silt. The population growth of fine clasts with time leads to an increase in yield strength and viscosity that progressively modifies the rheologic behavior. From a textural point of view, this is reflected in a bimodal granulometric distribution. Up to now this characteristic has been explained as the effect of bulking and/or sedimentation processes during transport. Our experimental results show that the type of fragmentation depends on particle size and is the consequence of strong clast-clast interaction and clast-fluid interactions. Coarse particles develop small fractures which cause the loss of sharp edges and asperities. Medium-sized particles develop through-going fractures that cause them to break apart. The latter process explains why intermediate granulometric classes progressively diminish with time in debris flows. Analogue experiments enable us to study the efficacy of clast fragmentation in modifying the textural character and flow behavior of debris flows without the influence of external factors such as erosion and sedimentation. The obtained results constitute the base of a new approach for modeling debris flow dynamics.

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Section: Introductionmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 75%

Section: Methodsmentioning

confidence: 99%

Section: Clast Morphologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Rheological changes induced by clast fragmentation in debris flows

Caballero¹,

Sarocchi

Ortega³

et al. 2014

JGR Earth Surface

Self Cite

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Experiments on floating bed rotating drums using magnetic particle tracking

et al. 2022

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Magnetic particle tracking (MPT) was employed to study a rotating drum filled with cork particles, using both air and water as interstitial medium. This noninvasive monitoring technique allows for the tracking of both particle translation and rotation in dry granular and liquid-solid systems. Measurements on the dry and floating bed rotating drum were compared and detailed analysis of the bed shape and velocity profiles was performed. It was found that the change of particle-wall and particleparticle interaction caused by the presence of water significantly affects the bed behavior. The decreased friction leads to slipping of the particles with respect to the wall, rendering the circulation rate largely insensitive to increased drum speed. It was also found that the liquid-particle interaction is determining for the behavior of the flowing layer. The well-defined experiments and in-depth characterization performed in this study provide an excellent validation case for multiphase flow models.

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