Topological inversions in coalescing granular media control fluid-flow regimes

Wadsworth, Fabian B.; Vasseur, Jérémie; Llewellin, Edward W.; Dobson, Katherine J.; Colombier, Mathieu; Aulock, Felix W. von; Fife, Julie L.; Wiesmaier, Sebastian; Hess, Kai‐Uwe; Scheu, Bettina; Lavallée, Yan; Dingwell, Donald B.

doi:10.1103/physreve.96.033113

Cited by 40 publications

(42 citation statements)

References 27 publications

(45 reference statements)

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“…It also allows investigation of very low connectivities and therefore better assess where the percolation threshold is crossed. This approach has only recently been adopted in volcanology (e.g., Couves et al, ; Vasseur & Wadsworth, ; Wadsworth, Vasseur, Llewellin, Dobson, et al, ). Another benefit from the XCT technique compared to pycnometry is that it provides information on the directionality of the connectivity (see Table ).…”

Section: Methodsmentioning

confidence: 99%

Vesiculation and Quenching During Surtseyan Eruptions at Hunga Tonga‐Hunga Ha'apai Volcano, Tonga

et al. 2018

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Surtseyan eruptions are shallow to emergent subaqueous explosive eruptions that owe much of their characteristic behavior to the interaction of magma with water. The difference in thermal properties between water and air affects the cooling and postfragmentation vesiculation processes in magma erupted into the water column. Here we study the vesiculation and cooling processes during the 2009 and 2014-2015 Surtseyan eruptions of Hunga Tonga-Hunga Ha'apai volcano by combining 2-D and 3-D vesicle-scale analyses of lapilli and bombs and numerical thermal modeling. Most of the lapilli and bombs show gradual textural variations from rim to core. The vesicle connectivity in the lapilli and bombs increases with vesicularity from fully isolated to completely connected and also increases from rim to core in transitional clasts. We interpret the gradual textural variations and the connectivity-vesicularity relationships as the result of postfragmentation bubble growth and coalescence interrupted at different stages by quenching in water. The measured vesicle size distributions are bimodal with a population of small and large vesicles. We interpret this bimodality as the result of two nucleation events, one prefragmentation with the nucleation and growth of large bubbles and one postfragmentation with nucleation of small vesicles. We link the thermal model with the textural variations in the clasts-showing a dependence on particle size, Leidenfrost effect, and initial melt temperature. In particular, the cooling profiles in the bombs are consistent with the gradual textural variations from rim to core in the clasts, likely caused by variations in time available for vesiculation before quenching. Wilding et al. Key Points:• Lapilli and bombs from Surtseyan eruptions show gradual textural variations due to the quenching in water • The kinetics of magma cooling during Surtseyan eruptions are influenced by particle size, radial position, and Leidenfrost effect • The 3-D analysis of vesicle metrics using X-ray microtomography allows quantification of the percolation threshold in volcanic rocksSupporting Information:• Supporting Information S1Correspondence to: M. Colombier,

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Section: Methodsmentioning

confidence: 99%

Vesiculation and Quenching During Surtseyan Eruptions at Hunga Tonga‐Hunga Ha'apai Volcano, Tonga

et al. 2018

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“…We use sintered samples because there is a rigorous theoretical framework for their hydraulic properties 13 (see section VI) and because they are simple and low-cost to manufacture. We note that this is not essential, because it requires specialist equipment (a furnace, large ceramic trays, and a pilla r drill with a sturdy coring diamond-tipped drill bit) and that commercially available readysintered filters would also be appropriate.…”

Section: Sample Materialsmentioning

confidence: 99%

“…If we take to be negligibly small compared with , the total porosity of the samples is simply = 1 − / . Sintered samples such as these do not have a measurable fraction of isolated porosity 13 .…”

Section: Sample Materialsmentioning

confidence: 99%

“…However, the online version of record will be different from this version once it has been copyedited and typeset. PLEASE CITE THIS ARTICLE AS DOI: 10.1119/10.0000296 been shown to have a permeability similar to that of the space between any domain of randomly placed freely-overlapping spheres 13,15 . The permeability for random distributions of freely overlapping spheres is given by which in turn can be used to calculate…”

Section: An Extra Step: Using a Theoretical Permeability Modelmentioning

confidence: 99%

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Determination of permeability using a classic Darcy water column

Wadsworth

Vossen

Schmid

et al. 2020

American Journal of Physics

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The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details.Pe rme ability is a macros copic prope rty of mate rials with a pe rcolating pore phas e , s uch as many rocks and filte rs . We de s cribe a s imple e xpe rime nt for the e mpirical de te rmination of permeability using a low-cos t me thod s imilar to that us e d by Darcy. We advocate the us e of controlle d cylindrical sintered filters, for which there is theoretical constraint of the pe rme ability as a function of poros ity, agains t which e mpirical re s ults can be compare d. The me thodology pre sented he re provide s a s te p-by-s te p approach to laboratory e xpe rime nts and nume rical te chnique s for fitting a line ar e quation to data, and is appropriate for unde rgraduate Phys ics , Earth Scie nce , or Engine e ring cours e s .

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“…Caricchi et al, 2007;Vona et al, 2011;Chevrel et al, 2013Chevrel et al, , 2015, porosity (e.g. Bagdassarov and Dingwell, 1992;Farquharson et al, 2015Farquharson et al, , 2016Wadsworth et al, 2017), and geochemistry (e.g. Giordano et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Upscaling permeability in anisotropic volcanic systems

Farquharson¹,

Wadsworth²

2018

Preprint

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Permeability is an increasingly prevalent metric included in volcano modelling; however, it is a property that can exhibit anisotropy in volcanic environments. Permeability of a layered medium can be described by the arithmetic or harmonic means of the permeabilities of the constituent units, depending on the orientation of flow with respect to layering (i.e. flow parallel or perpendicular to layering, respectively). We outline the theory underlying these formulations, and provide experimental permeability data measured on anisotropic volcanic materials in order to demonstrate this point. We highlight that permeability measured parallel to layering or bedding must be higher than that measured perpendicular to layering. Moreover, we emphasise that the choice of averaging method used to upscale permeability data (i.e.to calculate the equivalent permeability of a system) has important consequences on the validity of the derived values. We anticipate that these points will help move towards more realistic models of pressure evolution behaviour in volcanoes, and increase the utility of laboratory-derived data for volcano-scale modelling.

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Topological inversions in coalescing granular media control fluid-flow regimes

Cited by 40 publications

References 27 publications

Vesiculation and Quenching During Surtseyan Eruptions at Hunga Tonga‐Hunga Ha'apai Volcano, Tonga

Vesiculation and Quenching During Surtseyan Eruptions at Hunga Tonga‐Hunga Ha'apai Volcano, Tonga

Determination of permeability using a classic Darcy water column

Upscaling permeability in anisotropic volcanic systems

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