Enhanced mobility of polydisperse granular flows in a small flume

Yang, Qingmei; Su, Zushang; Cai, Fei; Ugai, Keizo

doi:10.1186/s40677-015-0019-4

Cited by 9 publications

(2 citation statements)

References 27 publications

(32 reference statements)

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“…Mixing and segregation of multi component dry mixtures has also been reported by references [6,8]. DEM models have been used to simulate the mixing of bidisperse dry granular particles as well as polydisperse dry granular flows [26,27]. As mentioned earlier, such extensive studies have not been performed in slurry flows.…”

Section: Introductionmentioning

confidence: 94%

Effect of size distribution on mixing of a polydisperse wet granular material in a belt-driven enclosure

et al. 2016

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Section: Introductionmentioning

confidence: 94%

Effect of size distribution on mixing of a polydisperse wet granular material in a belt-driven enclosure

et al. 2016

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“…Older deposits are commonly indurated, preventing the detailed study of sedimentology, and especially clast-size analysis. Scarcity, inaccessibility and complexity of deposits encourage alternative study methods such as analogue (e.g., Iverson et al, 2004;Dufresne, 2012;Yang et al, 2015;Manzella et al, 2016;Hu et al, 2020) and numerical modelling (e.g., Campbell et al, 1995;Thompson et al, 2009;Davies et al, 2010;Cuomo, 2020) to be employed instead of field investigations. However, any model regarding the propagation and emplacement of VDAs/RAs must be consistent with their morphological, sedimentological and structural features (Cruden and Varnes, 1996;Pudasaini and Hutter, 2007;.…”

Section: Introductionmentioning

confidence: 99%

Distributed stress fluidisation: Insights into the propagation mechanisms of the Abona volcanic debris avalanche (Tenerife) through a novel method for indurated deposit sedimentological analysis

et al. 2023

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Introduction: Volcanic debris avalanches mobilise large volumes and achieve long runouts with high destructive potential. However, the propagation processes that generate them are not currently explained by theoretical or numerical models, which are unable to represent deposit observations. Evaluation of the dynamics represented in deposits is therefore vital for constraining su ch models. The Abona volcanic debris avalanche deposit is located on the southern flank of the island of Tenerife, Spain. The deposit exhibits universal microfracturing and cataclasis. Fluidal features such as fluidal mixing of lithological units and diffuse boundaries, and mixed matrix are observed throughout the deposit.Methods: Field description including sedimentology and facies identification and the evaluation of their distribution have allowed the generation of a new conceptual model for the propagation dynamics of this volcanic debris avalanche, and potentially others with similar properties. The deposit is indurated making the detailed study of its sedimentology difficult, especially clast-size analysis. A novel method utilising structure from motion photogrammetry and photographic sampling was employed.Results: The universal cataclasis of the material and fluidal features suggest that the lack of a major competent material component allowed the mass to fragment and enabled fluidised granular flow behaviour. It is proposed that shear was periodically distributed throughout the body of the avalanche in chaotic temporary shear networks rearranging according to the instantaneous distribution of the mass. Stress and agitation were not temporally or spatially homogenous during propagation. This is also reflected in the unsystematic erosion of the substrate according to the variable basal shear accommodation.Discussion: It is proposed that lithological properties are potentially a determining factor for the propagation mechanisms, stress distribution, and consequently the evolution of a volcanic debris avalanche from the initial collapse to its emplacement. This study highlights the importance of dedicated field examinations of sedimentological, morphological, and structural features for providing constraints for models of volcanic debris avalanche dynamics and the factors dictating them. The novel methodology proposed has the potential of broadening the number of events that can be studied and enhancing the understanding of these complex and hazardous phenomena.

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Influence of Ice Content on the Run-Out of Rock-Ice Avalanches

Yang

et al. 2017

Advancing Culture of Living With Landslides

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Enhanced mobility of polydisperse granular flows in a small flume

Abstract: Background: A series of laboratory tests was conducted to investigate the influence of the interaction between coarse and fine particles on the mobility of granular flows in a small flume.

Cited by 9 publications

References 27 publications

Effect of size distribution on mixing of a polydisperse wet granular material in a belt-driven enclosure

Effect of size distribution on mixing of a polydisperse wet granular material in a belt-driven enclosure

Distributed stress fluidisation: Insights into the propagation mechanisms of the Abona volcanic debris avalanche (Tenerife) through a novel method for indurated deposit sedimentological analysis

Influence of Ice Content on the Run-Out of Rock-Ice Avalanches

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