Coupling of turbulent and non-turbulent flow
|
|
- Roy Turner
- 5 years ago
- Views:
Transcription
1 SUPPLEMENTARY INFORMATION DOI: /NGEO2794 Coupling of turbulent and non-turbulent flow Eric C. P. Breard, Gert Lube, Jim R. Jones, Josef Dufek, Shane J. Cronin, Greg A. Valentine and Anja Moebis Supplementary Fig. 1 Grain-size and particle density distributions of the initial experimental mixture. a, Grain-size distribution of the initial experimental mixture. b, density distribution of the natural volcanic particles composing the experimental mixture. The average particle density is 1950 kg.m -3. NATURE GEOSCIENCE 1
2
3 Supplementary Fig. 2 Grain-size distributions of the experimental PDC deposits in comparison to natural (ignimbrite) PDC deposits. a, Median grain-size diameter against sorting coefficient of experimental and natural deposits, grouped into fields of layers 1, 2A, 2B and 3 of the so-called standard ignimbrite unit 4. Experimental samples of layers 1, 2A, 2B and 3 were collected in vertical profiles from proximal to distal reaches. The corresponding fields of well-mapped PDC deposits depict the original data compilations of Refs.1 and 2 (Vulsini ignimbrites 1, Terceira ignimbrite 2, Campanian Ignimbrite 2, Atitlan ignimbrite 2, Vilama ignimbrite 2 ), with an addition of data from younger studies on the ignimbrite flow units T1, T2, T3 3,4 and M14 5 from Laacher See, and PDC deposits from the 1991 Unzen 6, 1991 Pinatubo 7 eruptions. b, Sketch of the experimental deposit sequence at 14 m from source highlighting layers 1, 2A, 2B, 2B PCZ (Pumice Concentration Zone) and 3. c, Grainsize distributions of layers 1, 2A, 2B, 2B PCZ and 3 shown in (b) in comparison to grain-size distributions of layers 1, 2A, 2B, and 3 of 12.9 ka ignimbrite T1 from Laacher See at 4.7±0.3 km from source 4 and the ka Grotte di Castro ignimbrite at c.10 km from source 8. d, Median grain-size diameter (MdΦ) and sorting coefficient (σφ) of grain-size distributions shown in (b). Note the strong similarities of vertical changes in the grain-size distributions of experimental and natural deposits: the median grain-size diameter at PELE and Laacher See strongly increases from basal layer 1 to the top of layer 2 ( to 2 mm), while it is relatively constant from layer to layer at Grotti di Castro, but it is characteristically finer grained in layer 3 ( mm); the sorting decreases upward from layer 1 to layer 2B from poorly sorted to very poorly sorted values, but improves to poorly sorted values in layer 3.
4 Supplementary Fig.3 Mesoscale turbulence structures in large-scale PDC experiments. Still-images from a high-speed movie of the flow at 3.1 m from the source at 0.06 (a, b) and 0.09 (c, d) seconds after flow front arrival. Mesoscale structures occur in the middle zone of intermediate turbulence and take the form of dentritic clusters of particles. White crosses in (b) and (d), numbered 1 and 2, depict the same features in both images and illustrate the rapid sedimentation of the mesoscale structures at velocities of ~1.7 m.s -1. Vertical white bars are 0.3 m long.
5 Supplementary Fig. 4 Example of the frequency distribution of the thickness of mesoscale clusters. Thickness frequency distribution of mesoscale clusters measured at the observer location of 3.1 m during a 0.15 second time interval corresponding to the passage of the middle zone of the head and the frontal portion of the body of the ash-cloud. The smallest detectable cluster thickness in high-speed movies is m.
6 Supplementary Fig. 5 Example of the grain-size distribution of the middle zone. Timeaveraged (0.15 second) grain-size distribution of particles transported in the middle zone at 3.1 m from source at a height of 0.3 m above the base during the passage of the head and frontal body regions. Flow sample was retrieved from transparent passive sediment sampler 9.
7 Parameter Nature PELE Particle diameter (m) Particle density (kg.m -3 ) Fluid density (kg.m -3 ) Dynamic viscosity of the 1x10-5 4x10-3 1x10-5 5x10-3 carrier phase (kg.m -1.s -1 ) Flow velocity (m.s -1 ) <2 20 Reynolds number 1x x x10 4 2x10 6 Stokes number 1.1x x x x10 4 Stability number 2.8x x x x10 5 Particle Froude number Richardson number 2x10-4 (-5x10 0 *) 1.1x x10 1 Supplementary Table 1 Bulk flow scaling of Natural PDCs 10 and PELE experimental currents. and are characteristic velocity and length scales of the flow (flow height). is the mixture density and is the ambient medium density. D is the particle diameter. and are the particle and gas densities, respectively. * Estimates of the range of negative values of the Richardson number corresponding to hot PDCs with buoyancy reversal are based on the study of volcanic plume 11 and PDCs 12.
8 Parameter Nature PELE Particle diameter (m) Particle density (kg.m -3 ) Fluid density (kg.m -3 ) Particle volumetric % % concentration Dynamic viscosity of the fluid 1*10-5 4*10-5 1*10-5 3*10-5 (kg.m -1.s -1 ) Underflow velocity (m.s -1 ) <2 15 Mass number 1*10 2 2*10 3 1* *10 3 Bagnold number 1*10-2 1*10 2 1*10 0 1*10 2 With Darcy number 1*10 2 1*10 4 1*10 0 1*10 3 Froude number Savage number 1*10-9 1*10-7 1*10-6 1*10-5 Supplementary Table 2 Underflow scaling of Natural PDCs 13 and PELE experimental currents. With and the particle and gas density, the shear rate, is the gas dynamic viscosity, D the particle diameter, h c the current height, g the acceleration of gravity. c denotes the flow concentration during propagation, c o is the maximum concentration at loose
9 packing, is the shear rate. k is the permeability of the granular medium. Re p is the particle Reynolds number. Initial conditions Range investigated Drop height (m) (3) Impact velocity (m.s -1 ) (7.5) Initial particle concentration of the mixture at 7 10 (9.8) impact (vol.%) Slope angle of the channel (degrees) 9 20 (20) Initial mass of mixture in hopper (kg) (1300) Median grain-size of the initial mixture (µm) (250) Quantity of fine ash (>4Φ) in the initial (10) mixture (wt.%) Supplementary Table 3 Initial and boundary conditions investigated at PELE. Range of experimental parameters investigated in large-scale experiments that led to the formation of the tripartite flow structure presented in this manuscript. Values enclosed in brackets indicate the condition of the experiment described in this manuscript.
10 Supplementary Note 1: Additional information on mesoscale turbulence clusters Quantitative information on mesoscale turbulence clusters in the middle zone could be derived from a high-speed video sequence recorded at 600 frames per second at 3.1 m from the impact zone. Measurements of mesoscale clusters are restricted to a 0.15 second time interval during the passing of the rear of the head and the frontal body regions. During this time, the time-averaged grain-size distribution of the middle zone has a unimodal form with a median particle diameter of 2.04 Φ and a sorting coefficient of 1.49 Φ (Supplementary Fig. 5). The time-averaged particle concentration of the middle zone is 2 ± 0.2 vol%. The particle concentration inside the mesoscale clusters is considerably higher and ranges between 4 15 vol%, and clusters occupy % of the observation area in the middle zone. Mesoscale clusters have a characteristic range of sizes and forms. In the size limit quantifiable in our video footage (> m), they occur as elongated and dendritic bands with lengths of m and thicknesses of m (mean of ± m (1σ); Supplementary Fig. 4). The frequency distribution of the cluster thicknesses displays a uni-modal and close to Gaussian form (Supplementary Fig. 4). The frequency of mesoscale
11 clusters passing a static observation point (during the 0.15 second time interval) is 280 clusters per second (280 Hz). Most clusters observed (>0.002 m thick) were already formed prior to their arrival at the observation window. Thus, a maximum time of cluster formation of 0.04 seconds is given by the duration between impact and arrival of the middle zone at the observer location. During the passage of clusters through the 1.2 m long observation window, they typically grow in size by merging during rapid settling. In many cases individual clusters can be followed through the observation window until sedimentation onto the upper surface of the underflow. These observations and measurements highlight a number of differences and similarities to mesoscale structures documented through numerical modelling and experiments on fluidized beds 14,15. In comparably low-velocity fluidized beds, clusters tend to continuously breakup and dissipate. The frequency of mesoscale clusters is significantly lower in the fluidized bed situation (0.2 Hz) 16, although the particle concentration is comparable (5 20 vol.%) 16,17. However, in both fluidized beds and our PDC experiments settling velocities of mesoscale clusters are much higher than individual particle settling velocities 15,17. References cited in Supplementary Material. 1 Sparks, R. S. J. Grain size variations in ignimbrites and implications for the transport of pyroclastic flows. Sedimentology 23, (1976). 2 Walker, G. P. L. Grain-size characteristics of pyroclastic deposits. Journal of Geology 79, (1971).
12 3 Freundt, A. & Schmincke, H. U. Lithic-enriched segregation bodies in pyroclastic flow deposits of Laacher See volcano (East Eifel, Germany). Journal of Volcanology & Geothermal Research 25, (1985). 4 Freundt, A. & Schmincke, H. U. Emplacement of small-volume pyroclastic flows at Laacher Sea (East-Eifel, Germany). Bulletin of Volcanology 48, (1986). 5 Hughes, S. R. & Druitt, T. H. Particle fabric in a small, type-2 ignimbrite flow unit (Laacher See, Germany) and implications for emplacement dynamics. Bulletin of Volcanology 60, (1998). 6 Watanabe, K., Ono, K., Sakaguchi, K., Takada, A. & Hoshizumi, H. Co-ignimbrite ash-fall deposits of the 1991 eruptions of Fugen-dake, Unzen Volcano, Japan. Journal of Volcanology and Geothermal Research 89, (1999). 7 Dartevelle, S., Ernst, G. G. J., Stix, J. & Bernard, A. Origin of the Mount Pinatubo climactic eruption cloud: Implication for volcanic hazards and atmospheric impacts. Geology, (2002). 8 Sparks, R. S. J., Self, S. & Walker, G. P. L. Products of Ignimbrite Eruptions. Geology (Boulder) 1, (1973). 9 Lube, G., Breard, E. C. P., Cronin, S. J. & Jones, J. Synthesizing large-scale pyroclastic flows: experimental design, scaling, and first results from PELE. Journal of Geophysical Research: Solid Earth 120, (2015). 10 Burgisser, A., Bergantz, G. W. & Breidenthal, R. E. Addressing complexity in laboratory experiments: the scaling of dilute multiphase flows in magmatic systems. Journal of Volcanology and Geothermal Research 141, (2005).
13 11 Carazzo, G., Kaminski, E. & Tait, S. The timing and intensity of column collapse during explosive volcanic eruptions. Earth and Planetary Science Letters 411, (2015). 12 Dufek, J. The Fluid Mechanics of Pyroclastic Density Currents. Annual Review of Fluid Mechanics 48, , doi: /annurev-fluid (2016). 13 Roche, O. Depositional processes and gas pore pressure in pyroclastic flows: an experimental perspective. Bulletin of Volcanology 74, (2012). 14 Zhang, D. Z. & VanderHeyden, W. B. The effect of mesoscale structures on the macroscopic momentum equations for two phase flows. Int. J. Multiph. Flow 28, (2002). 15 Chen, C. Investigations on Mesoscale Structure in Gas Solid Fluidization and Heterogeneous Drag Model PhD thesis, Tsinghua University, (2016). 16 Neri, A. & Gidaspow, D. Riser hydrodynamics: Simulation using kinetic theory. AIChE Journal 46, (2000). 17 Agrawal, K., Loezos, P. N., Syamlal, M. & Sundaresan, S. The role of meso-scale structures in rapid gas-solid flows. J. Fluid Mech 445, (2001).
Numerical Simulations of Turbulent Flow in Volcanic Eruption Clouds
Numerical Simulations of Turbulent Flow in Volcanic Eruption Clouds Project Representative Takehiro Koyaguchi Authors Yujiro Suzuki Takehiro Koyaguchi Earthquake Research Institute, University of Tokyo
More informationModeling dense pyroclastic basal flows from collapsing columns
Click Here for Full Article GEOPHYSICAL RESEARCH LETTERS, VOL. 35, L04305, doi:10.1029/2007gl032585, 2008 Modeling dense pyroclastic basal flows from collapsing columns E. E. Doyle, 1 A. J. Hogg, 2 H.
More informationSuspended load and bed-load transport of particle-laden gravity currents: the role of particle bed interaction
Theor. Comput. Fluid Dyn. DOI 10.1007/s00162-007-0041-6 ORIGINAL ARTICLE J. Dufek G. W. Bergantz Suspended load and bed-load transport of particle-laden gravity currents: the role of particle bed interaction
More informationGSA DATA REPOSITORY Esposti Ongaro et al. Supplement A. Multiphase flow formulation
GSA DATA REPOSITORY 2011173 Esposti Ongaro et al. Supplement A. Multiphase flow formulation Model equations Model equations express the Eulerian balance of mass, momentum and enthalpy for one gas phase,
More informationVolcanic Mass Flow Processes and Deposits
Volcanic Mass Flow Processes and Deposits Smith and Lowe, 1991 Lahars=hyperconcentrated (flood) flow (HFF) and debris flow Note ideal HFF deposit has normal grading, parallel bedding, better sorting Ideal
More informationVolcanic Plumes. JOHN WILEY & SONS Chichester New York Weinheim Brisbane Singapore Toronto
Volcanic Plumes R. S. J. SPARKS University of Bristol, UK M. I. BURSIK State University of New York, USA S. N. CAREY University of Rhode Island, USA J. S. GILBERT Lancaster University, UK L. S. GLAZE NASA/Goddard
More informationPyroclastic Deposits I: Pyroclastic Fall Deposits
Pyroclastic Deposits I: Pyroclastic Fall Deposits EAS 458 Volcanology Introduction We have seen that physics is useful in understanding volcanic processes, but physical models must be constrained by and
More informationThis article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and
This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution
More informationIncipient sediment motion across the river to debris-flow transition
Movie DR1 Movie DR2 Movie DR3 Movie DR4 GSA DATA REPOSITORY 2014067 SUPPLEMENTARY MATERIALS FOR Incipient sediment motion across the river to debris-flow transition Jeff P. Prancevic, Michael P. Lamb,
More informationField evidence for substrate entrainment by pyroclastic density currents and its effect on downstream dynamics at Mount St Helens, Washington (USA)
Field evidence for substrate entrainment by pyroclastic density currents and its effect on downstream dynamics at Mount St Helens, Washington (USA) Nicholas M. Pollock A Thesis submitted in partial fulfillment
More informationReconciling Pyroclastic Flow and Surge: the Multiphase Physics of Pyroclastic Density Currents.
Reconciling Pyroclastic Flow and Surge: the Multiphase Physics of Pyroclastic Density Currents. Alain Burgisser, George W. Bergantz To cite this version: Alain Burgisser, George W. Bergantz. Reconciling
More informationG 3. AN ELECTRONIC JOURNAL OF THE EARTH SCIENCES Published by AGU and the Geochemical Society
Geosystems G 3 AN ELECTRONIC JOURNAL OF THE EARTH SCIENCES Published by AGU and the Geochemical Society Article Volume 5, Number 8 18 August 2004 Q08004, doi:10.1029/2003gc000637 ISSN: 1525-2027 Numerical
More informationFiltered Two-Fluid Model for Gas-Particle Suspensions. S. Sundaresan and Yesim Igci Princeton University
Filtered Two-Fluid Model for Gas-Particle Suspensions S. Sundaresan and Yesim Igci Princeton University Festschrift for Professor Dimitri Gidaspow's 75th Birthday II Wednesday, November 11, 2009: 3:15
More informationAssessment of motion-induced fluidization of dense pyroclastic gravity currents
ANNALS OF GEOPHYSICS, VOL. 48, N. 4/5, August/October 005 Assessment of motion-induced fluidization of dense pyroclastic gravity currents Dipartimento di Ingegneria Chimica, Università degli Studi di Napoli
More informationExperimental study of gas-fluidized granular flows with implications for pyroclastic flow emplacement
JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 109,, doi:10.1029/2003jb002916, 2004 Experimental study of gas-fluidized granular flows with implications for pyroclastic flow emplacement O. Roche 1 UMR Magmas et
More informationVolcanic Eruptions and Hydrovolcanism
Find the Face Volcanic Eruptions and Hydrovolcanism Ocean Ridges Continental Rifts Subduction Zones: Continental Oceanic Back Arc Basins Hot Spots Plumes Cinder Cones Composite Volcanoes Shield VolcanoesCinder
More informationMultiphase flow dynamics of pyroclastic density currents during the May 18, 1980 lateral blast of Mount St. Helens
JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 117,, doi:10.1029/2011jb009081, 2012 Multiphase flow dynamics of pyroclastic density currents during the May 18, 1980 lateral blast of Mount St. Helens T. Esposti
More informationEstimates of the Dynamics of Volcano Eruption Column Using Real-time AVHRR Data
Estimates of the Dynamics of Volcano Eruption Column Using Real-time AVHRR Data Ignacio Galindo Centro Universitario de Investigaciones en Ciencias del Ambiente (CUICA) UNIVERSIDAD DE COLIMA, Colima, México
More informationJournal of Volcanology and Geothermal Research, 30 (1986) Elsevier Science Publishers B.V., Amsterdam -- Printed in The Netherlands
Journal of Volcanology and Geothermal Research, 30 (1986) 179--199 179 Elsevier Science Publishers B.V., Amsterdam -- Printed in The Netherlands A LABORATORY SIMULATION OF PYROCLASTIC FLOWS DOWN SLOPES
More informationSylvain Charbonnier. PASI Workshop About 60% of Indonesians live around 16 active volcanoes on the island of Java
Numerical modelling of pyroclastic flows: a case study from the recent activity of Merapi Volcano, Central Java, Indonesia Sylvain Charbonnier PASI Workshop 2011 Case study: Merapi Volcano! About 60% of
More informationReconciling pyroclastic ow and surge: the multiphase physics of pyroclastic density currents
Earth and Planetary Science Letters 202 (2002) 405^418 www.elsevier.com/locate/epsl a Reconciling pyroclastic ow and surge: the multiphase physics of pyroclastic density currents Alain Burgisser a;, George
More informationAvailable online at Los Alamos National Laboratory, EES Division, NM 87545, USA
Available online at www.sciencedirect.com Earth and Planetary Science Letters 262 (2007) 363 384 www.elsevier.com/locate/epsl Transient multiphase processes during the explosive eruption of basalt through
More informationData Repository Item 1
GSA DR 2006031 Burgisser, p. 1 Data Repository Item 1 of Burgisser, A., and Gardner. J., Using Hydraulic Equivalence to Discriminate Transport Processes of Volcanic Flows This Electronic Supplement contains
More informationMinimum fluidization velocity, bubble behaviour and pressure drop in fluidized beds with a range of particle sizes
Computational Methods in Multiphase Flow V 227 Minimum fluidization velocity, bubble behaviour and pressure drop in fluidized beds with a range of particle sizes B. M. Halvorsen 1,2 & B. Arvoh 1 1 Institute
More informationJournal of Volcanology and Geothermal Research
Journal of Volcanology and Geothermal Research 178 (2008) 94 103 Contents lists available at ScienceDirect Journal of Volcanology and Geothermal Research journal homepage: www. elsevier. com/ locate/ jvolgeores
More informationVolcaniclastic rocks
Volcaniclastic rocks - Session 08 - Pyroclastic surges Dr. Ioan Seghedi Types of surges Base surge Ground surge Ash cloud surge The anatomy of a surge Eruption of Capelinhos, Azores (1957) -- The phreatomagmatic
More informationarxiv:cond-mat/ v3 [cond-mat.stat-mech] 30 Jul 2004
Relation between dry granular flow regimes and morphology of deposits: formation of levées in pyroclastic deposits arxiv:cond-mat/5v [cond-mat.stat-mech] Jul Gwenaëlle Félix and Nathalie Thomas Laboratoire
More informationGEOS 606 Physical Volcanology GEOS 606 CRN credits
GEOS 606 Physical Volcanology GEOS 606 CRN 74060 3 credits September 1th December 17 th, 2011 Mondays, Wednesdays and Fridays MWF 10:30-11:30 Irving 208 and Elvey 101 Dr. Jonathan Dehn office: WRRB 108G,
More informationLaboratory studies on colliding gravity currents. Qiang ZHONG. Environmental Fluid Dynamics Group University of Notre Dame October
Laboratory studies on colliding gravity currents Qiang ZHONG Environmental Fluid Dynamics Group University of Notre Dame October 8 25 Outlines Introduction 2 Experiments 3 Currently Result 4 Conclusion
More informationDATA REPOSITORY ITEM 1 - PYROCLASTIC TERMINOLOGY. The volcaniclastic terminology used in this paper largely follows that of Fisher
DATA REPOSITORY ITEM 1 - PYROCLASTIC TERMINOLOGY The volcaniclastic terminology used in this paper largely follows that of Fisher and Schmincke (1984) and Heiken and Wohletz (1985). A deposit made of >75%
More informationLecture 3: Fundamentals of Fluid Flow: fluid properties and types; Boundary layer structure; unidirectional flows
GEOL 440 Sedimentology and stratigraphy: processes, environments and deposits Lecture 3: Fundamentals of Fluid Flow: fluid properties and types; Boundary layer structure; unidirectional flows Why study
More informationStatistics in Volcanology: Uncertainty in Volcanology Data and Models
: Data and Models School of Geosciences University of South Florida February 2017 Volcanic s... Eruption of Shinmoe-dake volcano, Kirishima volcano complex, Japan. Major research questions Tolbachik, Kamchatka,
More informationEffects of the crater on eruption column dynamics
Click Here for Full Article JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 115,, doi:10.1029/2009jb007146, 2010 Effects of the crater on eruption column dynamics Takehiro Koyaguchi, 1 Yujiro J. Suzuki, 2 and Tomofumi
More informationCOMPARISON OF TRANSPORT AND FRICTION OF MONO- SIZED AND TWO-SPECIES SEDIMENT IN UPPER PLANE BED REGIME
ISBN 978-83-927084-8-3 ISSN 0867-7964 COMPARISON OF TRANSPORT AND FRICTION OF MONO- SIZED AND TWO-SPECIES SEDIMENT IN UPPER PLANE BED REGIME Štěpán Zrostlík, Vojtěch Bareš, Jan Krupička, Tomáš Picek, Václav
More informationINFORMATION TO USERS U M I
INFORMATION TO USERS This manuscript has been reproduced from the microfilm master. UMI films the text directly from the original or copy submitted. Thus, some thesis and dissertation copies are in typewriter
More informationTRANSPORT AND EMPLACEMENT OF IGNIMBRITES AND RESEDIMENTED VOLCANICLASTICS FROM GUTÂI MTS., EASTERN CARPATHIANS, ROMANIA
STUDIA UNIVERSITATIS BABEŞ-BOLYAI, GEOLOGIA, XLIX, 1, 2004, 65-73 TRANSPORT AND EMPLACEMENT OF IGNIMBRITES AND RESEDIMENTED VOLCANICLASTICS FROM GUTÂI MTS., EASTERN CARPATHIANS, ROMANIA ALEXANDRINA FÜLÖP
More informationOlivier Roche, Santiago Montserrat, Yarko Niño, Aldo Tamburrino. HAL Id: hal
Experimental observations of water-like behavior of initially fluidized, dam break granular flows and their relevance for the propagation of ash-rich pyroclastic flows Olivier Roche, Santiago Montserrat,
More informationIVATF/2-WP/09 10/06/11. International PAPER WORKING TESTING. (Presented DISCUSSION. 2.1 presented. this working. paper, some.
International Civil Aviation Organization IVATF/2-WP/09 10/06/11 WORKING PAPER INTERNATIONAL VOLCANIC ASH TASK FORCE (IVATF) SECOND MEETING Montréal, 11 to 15 July 2011 Agenda Item 2: Report of the Science
More informationSources of Unsteady Column Dynamics in Pyroclastic Flow Eruptions
JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 96, NO. B13, PAGES 21,887-21,892, DECEMBER 10, 1991 Sources of Unsteady Column Dynamics in Pyroclastic Flow Eruptions GREG A. VALENTINE AND KENNETH H. WOHLETZ Earth
More informationStudies on flow through and around a porous permeable sphere: II. Heat Transfer
Studies on flow through and around a porous permeable sphere: II. Heat Transfer A. K. Jain and S. Basu 1 Department of Chemical Engineering Indian Institute of Technology Delhi New Delhi 110016, India
More informationGranular mass flows and Coulomb s friction in shear cell experiments: Implications for geophysical flows
JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 109,, doi:10.1029/2004jf000177, 2004 Granular mass flows and Coulomb s friction in shear cell experiments: Implications for geophysical flows B. Cagnoli and M. Manga
More information15. Physics of Sediment Transport William Wilcock
15. Physics of Sediment Transport William Wilcock (based in part on lectures by Jeff Parsons) OCEAN/ESS 410 Lecture/Lab Learning Goals Know how sediments are characteried (sie and shape) Know the definitions
More informationCFD Investigations of Effects of Cohesive Particles Proportion on Fluidization of Binary Particles
Proceedings of the 2 nd World Congress on Momentum, Heat and Mass Transfer (MHMT 17) Barcelona, Spain April 6 8, 2017 Paper No. ICMFHT 122 ISSN: 2371-5316 DOI: 10.11159/icmfht17.122 CFD Investigations
More informationWET EXPLOSIVE ERUPTIONS. Hawaii Photograph: Dorian Weisel
WET EXPLOSIVE ERUPTIONS Hawaii Photograph: Dorian Weisel WET EXPLOSIVE ERUPTIONS mechanisms hot magma/ hot rock + water pyroclasts + steam rapid expansion of gas fragmentation of magma + wall rock external
More informationEstimates of the dynamics of volcano eruption column using real-time AVHRR data
Estimates of the dynamics of volcano eruption column using real-time AVHRR data Ignacio Galindo Centro Universitario de Investigaciones en Ciencias del Ambiente (CUICA) UNIVERSIDAD DE COLIMA, Colima, México
More informationVolcanoes. volcanic hazards. Image courtesy of USGS.
Volcanoes volcanic hazards Volcanic hazards Pyroclastic flows and surges Pyroclastic flows and surges PYROCLAST: all solid fragments ejected from volcanoes PYROCLASTIC FLOW: A flow of hot gas and volcanic
More informationThe Atmospheric Boundary Layer. The Surface Energy Balance (9.2)
The Atmospheric Boundary Layer Turbulence (9.1) The Surface Energy Balance (9.2) Vertical Structure (9.3) Evolution (9.4) Special Effects (9.5) The Boundary Layer in Context (9.6) Fair Weather over Land
More informationCFD simulation of gas solid bubbling fluidized bed: an extensive assessment of drag models
Computational Methods in Multiphase Flow IV 51 CFD simulation of gas solid bubbling fluidized bed: an extensive assessment of drag models N. Mahinpey 1, F. Vejahati 1 & N. Ellis 2 1 Environmental Systems
More informationDynamics of Pyroclastic Density Currents: Conditions That Promote Substrate Erosion and Self-Channelization - Mount St Helens, Washington (USA)
Boise State University ScholarWorks Geosciences Faculty Publications and Presentations Department of Geosciences 4-15-2014 Dynamics of Pyroclastic Density Currents: Conditions That Promote Substrate Erosion
More informationG 3. AN ELECTRONIC JOURNAL OF THE EARTH SCIENCES Published by AGU and the Geochemical Society
Geosystems G 3 AN ELECTRONIC JOURNAL OF THE EARTH SCIENCES Published by AGU and the Geochemical Society Article Volume 7, Number 11 7 November 2006 Q11003, doi:10.1029/2006gc001314 ISSN: 1525-2027 Click
More informationCalderas. Myojin Knoll Submarine Caldera m. 500 m. 5 km. (after Kennedy and Stix, 2003)
Calderas Myojin Knoll Submarine Caldera 1400 m 500 m 5 km (after Kennedy and Stix, 2003) Definition Outline Relationships to Eruption Volume and VEI Structural Components Types Caldera Genetic Models and
More informationAuthor's personal copy
Journal of Volcanology and Geothermal Research 5-6 () 3 44 Contents lists available at SciVerse ScienceDirect Journal of Volcanology and Geothermal Research journal homepage: www.elsevier.com/locate/jvolgeores
More informationTable of Contents. Preface... xiii
Preface... xiii PART I. ELEMENTS IN FLUID MECHANICS... 1 Chapter 1. Local Equations of Fluid Mechanics... 3 1.1. Forces, stress tensor, and pressure... 4 1.2. Navier Stokes equations in Cartesian coordinates...
More informationIntermezzo I. SETTLING VELOCITY OF SOLID PARTICLE IN A LIQUID
Intermezzo I. SETTLING VELOCITY OF SOLID PARTICLE IN A LIQUID I.1 TERMINAL SETTLING VELOCITY OF A SPHERICAL PARTICLE, vts A balance of the gravitational, buoyancy and drag forces on the submerged solid
More informationScarpati Claudio and Perrotta Annamaria
GSA DATA REPOSITORY 2012292 Supplemental Information Scarpati Claudio (email:claudio.scarpati@unina.it) and Perrotta Annamaria Dipartimento di Scienze della Terra, Università di Napoli Federico II Erosional
More informationAugustine Volcano, Calculating Ash Fallout
Augustine Volcano, 1986 - Calculating Fallout -What controls the fallout of particles through the atmosphere? -Can we predict when and where an erupted ash cloud will fall out on the Earth? Summit: 1260
More informationPiles of Fire Individual and Team Project Modified from
Piles of Fire Individual and Team Project Modified from http://www.spacegrant.hawaii.edu/class_acts/pilesfirete.html The purpose of this activity is to investigate how particle size affects the angle of
More informationWHEN IS A SURGE NOT A SURGE? THAT IS THE PERPLEXING QUESTION. (for emergency managers)
WHEN IS A SURGE NOT A SURGE? THAT IS THE PERPLEXING QUESTION (for emergency managers) Mount St Helens, May 18, 1980 37 years, 5 months, and 6 days ago.. Eyewitnesses there were many! Rosenbaum and Waitt,
More informationModel of pyroclastic flow and its numerical simulation
Sediment Problems: Strategies for Monitoring, Prediction and Control (Proceedings of the Yokohama Symposium, July 1993). IAHS Publ. no. 217, 1993. 67 Model of pyroclastic flow and its numerical simulation
More informationGFD 2013 Lecture 10: Gravity currents on slopes and in turbulent environments
GFD 2013 Lecture 10: Gravity currents on slopes and in turbulent environments Paul Linden; notes by Gregory Wagner and Barbara Zemskova June 28, 2013 1 Introduction Natural gravity currents are often found
More informationGrain size and flow volume effects on granular flow mobility in numerical simulations:
Grain size and flow volume effects on granular flow mobility in numerical simulations: 3-D discrete element modeling of flows of angular rock fragments B. Cagnoli 1, and A. Piersanti 1 1 Istituto Nazionale
More informationTephra2 Tutorial Scripts By Leah Courtland
Tephra2 Tutorial Scripts By Leah Courtland Tephra2 Tutorial 1: An Introduction This video will introduce you to the concepts behind the tephra2 online simulation tool. Tephra2 uses the advection diffusion
More informationIgneous and Metamorphic Rock Forming Minerals. Department of Geology Mr. Victor Tibane SGM 210_2013
Igneous and Metamorphic Rock Forming Minerals Department of Geology Mr. Victor Tibane 1 SGM 210_2013 Intrusive and Effusive Rocks Effusive rocks: rapid cooling small crystalls or glas Lava & ash Magmatic
More informationDOWNSTREAM SORTING OF SEDIMENT (additional control on channel width, depth and slope)
DOWNSTREAM SORTING OF SEDIMENT (additional control on channel width, depth and slope) Image removed due to copyright concerns As the gravel gets finer, it is transported at lower slopes. The result is
More informationPAPER 345 ENVIRONMENTAL FLUID DYNAMICS
MATHEMATICAL TRIPOS Part III Monday, 11 June, 2018 9:00 am to 12:00 pm PAPER 345 ENVIRONMENTAL FLUID DYNAMICS Attempt no more than THREE questions. There are FOUR questions in total. The questions carry
More informationSand Ripple Dynamics on the Inner Shelf
Sand Ripple Dynamics on the Inner Shelf Donald N. Slinn Department of Civil and Coastal Engineering, University of Florida Gainesville, FL 32611-6590, Phone: (352) 392-9537 x 1431 Fax: (352) 392-3466 E-mail:
More informationAbout Some Features of a Magma Flow Structure at Explosive Volcano Eruptions
About Some Features of a Magma Flow Structure at Explosive Volcano Eruptions V. Kedrinskiy 1 Introduction The cyclic character of magma ejections is one of the basic aspects in the research field of the
More informationPyroclastic Flows. Lesson 6
Pyroclastic Flows Lesson 6 P yroclastic flows are one of the most dangerous natural events that occur on our planet. They can at hurricane speeds down the slopes of a mountain, destroying everything in
More informationBed Sherwood Number and Chemical Kinetic Coefficient in a Fuel Reactor of Chemical Loopling Combustion by Eulerian CFD Modeling
Engineering Conferences International ECI Digital Archives The 14th International Conference on Fluidization From Fundamentals to Products Refereed Proceedings 2013 Bed Sherwood Number and Chemical Kinetic
More informationHow does magma reach the surface?
How does magma reach the surface? 2004-2008, effusive 1980, explosive Michael Manga Why do volcanoes (only sometimes) erupt explosively? 2004-2008, effusive 1980, explosive Michael Manga Gonnermann and
More informationC C C C 2 C 2 C 2 C + u + v + (w + w P ) = D t x y z X. (1a) y 2 + D Z. z 2
This chapter provides an introduction to the transport of particles that are either more dense (e.g. mineral sediment) or less dense (e.g. bubbles) than the fluid. A method of estimating the settling velocity
More informationNevado Del Ruiz, Lahars
Nevado Del Ruiz, 1985 - Lahars Lecture Objectives -Basics of lahars: definition, characteristics -Ruiz case study: hazards, impacts Mt. Pinatubo lahar footage by Mike Dolan (MTU) Mt. Pinatubo lahar footage
More informationFluidisational velocity, resistance of permeable material layer
Fluidisational velocity, resistance of permeable material layer Fluidisation is a process whereby a granular material is converted from a static solidlike state to a dynamic fluid-like state. This process
More informationAn experimental investigation of density-stratified inertial gravity currents
Sedimentology (2004) 51, 767 789 doi: 10.1111/j.1365-3091.2004.00650.x An experimental investigation of density-stratified inertial gravity currents C. GLADSTONE*, L. J. RITCHIE 1,R.S.J.SPARKSà and A.
More informationExperiments at the University of Minnesota (draft 2)
Experiments at the University of Minnesota (draft 2) September 17, 2001 Studies of migration and lift and of the orientation of particles in shear flows Experiments to determine positions of spherical
More informationPLINIAN AND SUBPLINIAN ERUPTIONS
PLINIAN AND SUBPLINIAN ERUPTIONS A FIELD PERSPECTIVE RAFFAELLO CIONI DIP.TO SCIENZE DELLA TERRA UNIVERSITA DI FIRENZE THANKS TO: MAURO ROSI, MARCO PISTOLESI, COSTANZA BONADONNA, KATHY CASHMAN, LUCIA GURIOLI,
More informationCHBE 344 Unit Operations I Fall 2009 Course Syllabus
CHBE 344 Course Syllabus page 1 CHBE 344 Unit Operations I Fall 2009 Course Syllabus Course (Calendar) Description Characterization of particles; comminution, screening and classification; filtration,
More informationApplied Fluid Mechanics
Applied Fluid Mechanics 1. The Nature of Fluid and the Study of Fluid Mechanics 2. Viscosity of Fluid 3. Pressure Measurement 4. Forces Due to Static Fluid 5. Buoyancy and Stability 6. Flow of Fluid and
More informationThe role of interparticle forces in the fluidization of micro and nanoparticles
The role of interparticle forces in the fluidization of micro and nanoparticles A. Castellanos POWDER FLOW 2009 London, December 16 Acknowledgements The experimental work presented here has been done in
More informationStability and nonlinear dynamics of a settling fresh water particle laden fluid below a salt water layer
Stability and nonlinear dynamics of a settling fresh water particle laden fluid below a salt water layer Abstract C. Reyes, C. F. Ihle Department of Mining Engineering, and Advanced Mining Technology Center,
More informationErosion of sand under high flow velocities
Delft University of Technology Faculty of Mechanical, Maritime and Materials Engineering Department of Offshore Engineering Erosion of sand under high flow velocities Author: Juneed Sethi MSc Thesis Thesis
More informationLittoral blasts: Pumice-water heat transfer and the conditions for steam explosions when pyroclastic flows enter the ocean
Click Here for Full Article JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 112,, doi:10.1029/2006jb004910, 2007 Littoral blasts: Pumice-water heat transfer and the conditions for steam explosions when pyroclastic
More information(3) Sediment Movement Classes of sediment transported
9/17/15 (3) Sediment Movement Classes of sediment transported Dissolved load Suspended load Important for scouring algae Bedload (5-10% total load) Moves along bed during floods Source of crushing for
More informationReceived 1 May 2004; accepted 6 April 2005
Sedimentary Geology 179 (2005) 49 69 www.elsevier.com/locate/sedgeo Comparison of spatio temporal evolution of experimental particulate gravity flows at two different initial concentrations, based on velocity,
More informationGSA Data Repository
GSA Data Repository 2014300 Permeability reduction of fractured rhyolite in volcanic conduits and its control on eruption cyclicity Satoshi Okumura & Osamu Sasaki Typical Displacement During Compression
More informationIntroduction Theory Vulcano Model Results Conclusions Acknowledgements. Introduction Theory Vulcano Model Results Conclusions Acknowledgements
Time-dependent modelling of the electric and magnetic fields caused by fluid flow in Vulcano, Italy Emilie Walker & Paul Glover Université Laval, Québec, Canada Plan Introduction Theory Vulcano Model Results
More informationSIMULATION OF A 2D GRANULAR COLUMN COLLAPSE ON A RIGID BED
1 SIMULATION OF A 2D GRANULAR COLUMN COLLAPSE ON A RIGID BED WITH LATERAL FRICTIONAL EFFECTS High slope results and comparison with experimental data Nathan Martin1, Ioan Ionescu2, Anne Mangeney1,3 François
More informationAerodynamics of stratovolcanoes during multiphase processes
JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 117,, doi:10.1029/2011jb008769, 2012 Aerodynamics of stratovolcanoes during multiphase processes Domenico M. Doronzo, 1,2 Joan Martí, 3 Roberto Sulpizio, 2,4 and Pierfrancesco
More informationTransient two-dimensional dynamics in the upper conduit of a rhyolitic eruption: A comparison of closure models for the granular stress
Journal of Volcanology and Geothermal Research 143 (2005) 113 132 www.elsevier.com/locate/jvolgeores Transient two-dimensional dynamics in the upper conduit of a rhyolitic eruption: A comparison of closure
More informationNumerical Simulation of the Mantle Convection and Subduction Process
Numerical Simulation of the Mantle Convection and Subduction Process Project Representative Yoshio Fukao Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology
More informationSedimentation Scour Model Gengsheng Wei, James Brethour, Markus Grünzner and Jeff Burnham August 2014; Revised October 2014
Flow Science Report 03-14 Sedimentation Scour Model Gengsheng Wei, James Brethour, Markus Grünzner and Jeff Burnham August 2014; Revised October 2014 1. Introduction The three-dimensional sediment scour
More informationMixing and Turbulence
Mixing and Turbulence November 3, 2012 This section introduces some elementary concepts associated with mixing and turbulence in the environment. 1 Conserved Variables Studies of mixing of different airmasses
More informationParticles in Fluids. Sedimentation Fluidized beds Size segregation under shear Pneumatic transport Filtering Saltation Rheology of suspensions
Particles in Fluids Sedimentation Fluidized beds Size segregation under shear Pneumatic transport Filtering Saltation Rheology of suspensions Sandstorm Fluidized Bed Equation of motion v of v fluid v vx
More informationSedimentary Geology 220 (2009) Contents lists available at ScienceDirect. Sedimentary Geology
Sedimentary Geology 220 (2009) 227 242 Contents lists available at ScienceDirect Sedimentary Geology journal homepage: www.elsevier.com/locate/sedgeo Sedimentation and welding processes of dilute pyroclastic
More informationChapter 18. Volcanism
Chapter 18 Volcanism Ring of fire contains 66% of world s active volcanoes Convergent : Divergent: Icelandic Eruption Mount Etna Different Kinds of eruptions: Volcanic activity is controlled by plate tectonics,
More informationExperimentally determined distribution of granular-flow characteristics in collisional bed load transport
Experimentally determined distribution of granular-flow characteristics in collisional bed load transport Václav Matoušek 1,*, Štěpán Zrostlík 1, Luigi Fraccarollo 2, Anna Prati 2, and Michele Larcher
More informationSUPPLEMENTARY INFORMATION
SUPPLEMENTARY INFORMATION DOI: 10.1038/NGEO1992 Seismic detection of an active subglacial magmatic complex in Marie Byrd Land, Antarctica TABLE OF CONTENTS 1. Additional Study Information 1.1 Station Locations
More informationStudy of Sediment Transport in Shallow Channel Flows
This paper was peer-reviewed for scientific content. Pages 77-724. In: D.E. Stott, R.H. Mohtar and G.C. Steinhardt (eds). 2. Sustaining the Global Farm. Selected papers from the th International Soil Conservation
More informationPore Water Pressure Contribution to Debris Flow Mobility
American Journal of Environmental Sciences 5 (4): 487-493, 2009 ISSN 1553-345X 2009 Science Publications Pore Water Pressure Contribution to Debris Flow Mobility Chiara Deangeli DITAG-Department of Land,
More informationSUPPLEMENTARY INFORMATION
SUPPLEMENTARY INFORMATION DOI: 10.1038/NGEO1887 Diverse calving patterns linked to glacier geometry J. N. Bassis and S. Jacobs 1. Supplementary Figures (a) (b) (c) Supplementary Figure S1 Schematic of
More information