Characterization of shape and terminal velocity of tephra particles erupted during the 2002 eruption of Etna volcano, Italy
In this paper, we present a complete morphological characterization of the ash particles erupted on 18 December 2002 from Etna volcano, Italy. The work is based on the acquisition and processing of bidimensional digital images carried out by scanning electron microscopy (SEM) to obtain shape paramet...
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| Veröffentlicht in: | Bulletin of volcanology 2008-09, Vol.70 (9), p.1103-1112 |
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| description | In this paper, we present a complete morphological characterization of the ash particles erupted on 18 December 2002 from Etna volcano, Italy. The work is based on the acquisition and processing of bidimensional digital images carried out by scanning electron microscopy (SEM) to obtain shape parameters by image analysis. We measure aspect ratio (AR), form factor (FF), compactness (CC), and rectangularity (RT) of 2065 ash particles with size between 0.026 and 1.122 mm. We evaluate the variation of these parameters as a function of the grain-size. Ash particles with a diameter of 0.250 mm are subelongate. We find that, on average, particles with a diameter of 0.50 mm are angular. Using this morphological analysis and an empirical relation between the drag coefficient (
C
D
) and Reynolds number (
R
e
) of Wilson and Huang (Earth Planet Sci Lett 44:311–324, 1979), we calculate the terminal settling velocities (
V
WH
). The comparisons between these velocities and those calculated with the formula of Kunii and Levenspiel (
Fluidization engineering
. Wiley, New York, pp 97, 1969) (
V
KL
), which considers ash particles as spheres, show that
V
KL
are in average 1.28 greater than
V
WH
. Hence, we quantify the systematic error on the spatial distribution of the mass computed around the volcano carried out by tephra dispersal models when the particles are assumed to be spherical. |
| doi_str_mv | 10.1007/s00445-007-0192-8 |
| format | Article |
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C
D
) and Reynolds number (
R
e
) of Wilson and Huang (Earth Planet Sci Lett 44:311–324, 1979), we calculate the terminal settling velocities (
V
WH
). The comparisons between these velocities and those calculated with the formula of Kunii and Levenspiel (
Fluidization engineering
. Wiley, New York, pp 97, 1969) (
V
KL
), which considers ash particles as spheres, show that
V
KL
are in average 1.28 greater than
V
WH
. Hence, we quantify the systematic error on the spatial distribution of the mass computed around the volcano carried out by tephra dispersal models when the particles are assumed to be spherical.</description><identifier>ISSN: 0258-8900</identifier><identifier>EISSN: 1432-0819</identifier><identifier>DOI: 10.1007/s00445-007-0192-8</identifier><identifier>CODEN: BUVOEW</identifier><language>eng</language><publisher>Berlin/Heidelberg: Springer-Verlag</publisher><subject>Crystalline rocks ; Earth and Environmental Science ; Earth Sciences ; Earth, ocean, space ; Engineering and environment geology. Geothermics ; Exact sciences and technology ; Fluidization ; Geology ; Geophysics ; Geophysics/Geodesy ; Igneous and metamorphic rocks petrology, volcanic processes, magmas ; Mineralogy ; Natural hazards: prediction, damages, etc ; Particle physics ; Particle size ; Research Article ; Scanning electron microscopy ; Scattering ; Sedimentology ; Seismology ; Settling velocity ; Spatial distribution ; Volcanoes ; Volcanology</subject><ispartof>Bulletin of volcanology, 2008-09, Vol.70 (9), p.1103-1112</ispartof><rights>Springer-Verlag 2007</rights><rights>2008 INIST-CNRS</rights><rights>Springer-Verlag 2008</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a434t-cc225be950cfb7ed554e32b08d4f1b32d34d498ae5c6a1af4d30bbcc97e835db3</citedby><cites>FETCH-LOGICAL-a434t-cc225be950cfb7ed554e32b08d4f1b32d34d498ae5c6a1af4d30bbcc97e835db3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1007/s00445-007-0192-8$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1007/s00445-007-0192-8$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,780,784,27924,27925,41488,42557,51319</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=20618180$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Coltelli, M.</creatorcontrib><creatorcontrib>Miraglia, L.</creatorcontrib><creatorcontrib>Scollo, S.</creatorcontrib><title>Characterization of shape and terminal velocity of tephra particles erupted during the 2002 eruption of Etna volcano, Italy</title><title>Bulletin of volcanology</title><addtitle>Bull Volcanol</addtitle><description>In this paper, we present a complete morphological characterization of the ash particles erupted on 18 December 2002 from Etna volcano, Italy. The work is based on the acquisition and processing of bidimensional digital images carried out by scanning electron microscopy (SEM) to obtain shape parameters by image analysis. We measure aspect ratio (AR), form factor (FF), compactness (CC), and rectangularity (RT) of 2065 ash particles with size between 0.026 and 1.122 mm. We evaluate the variation of these parameters as a function of the grain-size. Ash particles with a diameter of <0.125 mm vary from mostly equant to very equant, ash particles between 0.125 and 0.250 mm have an intermediate shape, and particles with diameters >0.250 mm are subelongate. We find that, on average, particles with a diameter of <0.250 mm are subrounded, particles between 0.250 and 0.50 mm are subangular, and particles >0.50 mm are angular. Using this morphological analysis and an empirical relation between the drag coefficient (
C
D
) and Reynolds number (
R
e
) of Wilson and Huang (Earth Planet Sci Lett 44:311–324, 1979), we calculate the terminal settling velocities (
V
WH
). The comparisons between these velocities and those calculated with the formula of Kunii and Levenspiel (
Fluidization engineering
. Wiley, New York, pp 97, 1969) (
V
KL
), which considers ash particles as spheres, show that
V
KL
are in average 1.28 greater than
V
WH
. Hence, we quantify the systematic error on the spatial distribution of the mass computed around the volcano carried out by tephra dispersal models when the particles are assumed to be spherical.</description><subject>Crystalline rocks</subject><subject>Earth and Environmental Science</subject><subject>Earth Sciences</subject><subject>Earth, ocean, space</subject><subject>Engineering and environment geology. Geothermics</subject><subject>Exact sciences and technology</subject><subject>Fluidization</subject><subject>Geology</subject><subject>Geophysics</subject><subject>Geophysics/Geodesy</subject><subject>Igneous and metamorphic rocks petrology, volcanic processes, magmas</subject><subject>Mineralogy</subject><subject>Natural hazards: prediction, damages, etc</subject><subject>Particle physics</subject><subject>Particle size</subject><subject>Research Article</subject><subject>Scanning electron microscopy</subject><subject>Scattering</subject><subject>Sedimentology</subject><subject>Seismology</subject><subject>Settling velocity</subject><subject>Spatial distribution</subject><subject>Volcanoes</subject><subject>Volcanology</subject><issn>0258-8900</issn><issn>1432-0819</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2008</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><recordid>eNp1UE1r3DAQFaWBbjf5AbmJQm91MvralY5lSdvAQi7J2YylcdbBsV1JDmzz52PjpTnlNI95H8w8xi4FXAmA7XUC0NoUEyxAOFnYT2wltJIFWOE-sxVIYwvrAL6wryk9AUzkZrtir7sDRvSZYvMPc9N3vK95OuBAHLvAp_1z02HLX6jtfZOPM51pOETkA8bc-JYSpzgOmQIPY2y6R54PxCWAXPanzJvcIX_pW49d_4PfZmyP5-ysxjbRxWmu2cOvm_vdn2J_9_t293NfoFY6F95LaSpyBnxdbSkYo0nJCmzQtaiUDEoH7SyS8RsUWOugoKq8d1uyyoRKrdm3JXeI_d-RUi6f-jFOX6VSgrIb55yZRGIR-dinFKkuh9g8YzyWAsq54nKpuJzhXHFpJ8_3UzAmj20dsfNN-m-UsBFWWJh0ctGlYS6I4vsBH4e_Abi7jTg</recordid><startdate>20080901</startdate><enddate>20080901</enddate><creator>Coltelli, M.</creator><creator>Miraglia, L.</creator><creator>Scollo, S.</creator><general>Springer-Verlag</general><general>Springer</general><general>Springer Nature B.V</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>7TG</scope><scope>7TN</scope><scope>7XB</scope><scope>88I</scope><scope>8FK</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BHPHI</scope><scope>BKSAR</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>F1W</scope><scope>GNUQQ</scope><scope>H96</scope><scope>HCIFZ</scope><scope>KL.</scope><scope>L.G</scope><scope>M2P</scope><scope>PCBAR</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>Q9U</scope></search><sort><creationdate>20080901</creationdate><title>Characterization of shape and terminal velocity of tephra particles erupted during the 2002 eruption of Etna volcano, Italy</title><author>Coltelli, M. ; Miraglia, L. ; Scollo, S.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a434t-cc225be950cfb7ed554e32b08d4f1b32d34d498ae5c6a1af4d30bbcc97e835db3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2008</creationdate><topic>Crystalline rocks</topic><topic>Earth and Environmental Science</topic><topic>Earth Sciences</topic><topic>Earth, ocean, space</topic><topic>Engineering and environment geology. Geothermics</topic><topic>Exact sciences and technology</topic><topic>Fluidization</topic><topic>Geology</topic><topic>Geophysics</topic><topic>Geophysics/Geodesy</topic><topic>Igneous and metamorphic rocks petrology, volcanic processes, magmas</topic><topic>Mineralogy</topic><topic>Natural hazards: prediction, damages, etc</topic><topic>Particle physics</topic><topic>Particle size</topic><topic>Research Article</topic><topic>Scanning electron microscopy</topic><topic>Scattering</topic><topic>Sedimentology</topic><topic>Seismology</topic><topic>Settling velocity</topic><topic>Spatial distribution</topic><topic>Volcanoes</topic><topic>Volcanology</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Coltelli, M.</creatorcontrib><creatorcontrib>Miraglia, L.</creatorcontrib><creatorcontrib>Scollo, S.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>ProQuest Central (Corporate)</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Oceanic Abstracts</collection><collection>ProQuest Central (purchase pre-March 2016)</collection><collection>Science Database (Alumni Edition)</collection><collection>ProQuest Central (Alumni) (purchase pre-March 2016)</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Natural Science Collection</collection><collection>Earth, Atmospheric & Aquatic Science Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>ProQuest Central Student</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>SciTech Premium Collection</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Science Database</collection><collection>Earth, Atmospheric & Aquatic Science Database</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central Basic</collection><jtitle>Bulletin of volcanology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Coltelli, M.</au><au>Miraglia, L.</au><au>Scollo, S.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Characterization of shape and terminal velocity of tephra particles erupted during the 2002 eruption of Etna volcano, Italy</atitle><jtitle>Bulletin of volcanology</jtitle><stitle>Bull Volcanol</stitle><date>2008-09-01</date><risdate>2008</risdate><volume>70</volume><issue>9</issue><spage>1103</spage><epage>1112</epage><pages>1103-1112</pages><issn>0258-8900</issn><eissn>1432-0819</eissn><coden>BUVOEW</coden><abstract>In this paper, we present a complete morphological characterization of the ash particles erupted on 18 December 2002 from Etna volcano, Italy. The work is based on the acquisition and processing of bidimensional digital images carried out by scanning electron microscopy (SEM) to obtain shape parameters by image analysis. We measure aspect ratio (AR), form factor (FF), compactness (CC), and rectangularity (RT) of 2065 ash particles with size between 0.026 and 1.122 mm. We evaluate the variation of these parameters as a function of the grain-size. Ash particles with a diameter of <0.125 mm vary from mostly equant to very equant, ash particles between 0.125 and 0.250 mm have an intermediate shape, and particles with diameters >0.250 mm are subelongate. We find that, on average, particles with a diameter of <0.250 mm are subrounded, particles between 0.250 and 0.50 mm are subangular, and particles >0.50 mm are angular. Using this morphological analysis and an empirical relation between the drag coefficient (
C
D
) and Reynolds number (
R
e
) of Wilson and Huang (Earth Planet Sci Lett 44:311–324, 1979), we calculate the terminal settling velocities (
V
WH
). The comparisons between these velocities and those calculated with the formula of Kunii and Levenspiel (
Fluidization engineering
. Wiley, New York, pp 97, 1969) (
V
KL
), which considers ash particles as spheres, show that
V
KL
are in average 1.28 greater than
V
WH
. Hence, we quantify the systematic error on the spatial distribution of the mass computed around the volcano carried out by tephra dispersal models when the particles are assumed to be spherical.</abstract><cop>Berlin/Heidelberg</cop><pub>Springer-Verlag</pub><doi>10.1007/s00445-007-0192-8</doi><tpages>10</tpages></addata></record> |
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| issn | 0258-8900 1432-0819 |
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| subjects | Crystalline rocks Earth and Environmental Science Earth Sciences Earth, ocean, space Engineering and environment geology. Geothermics Exact sciences and technology Fluidization Geology Geophysics Geophysics/Geodesy Igneous and metamorphic rocks petrology, volcanic processes, magmas Mineralogy Natural hazards: prediction, damages, etc Particle physics Particle size Research Article Scanning electron microscopy Scattering Sedimentology Seismology Settling velocity Spatial distribution Volcanoes Volcanology |
| title | Characterization of shape and terminal velocity of tephra particles erupted during the 2002 eruption of Etna volcano, Italy |
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