Quantification of ash sedimentation dynamics through depolarisation imaging with AshCam

Abstract Even modest ash-rich volcanic eruptions can severely impact a range of human activities, especially air travel. The dispersal of ash in these eruptions depends critically on aggregation and sedimentation processes – however these are difficult to quantify in volcanic plumes. Here, we image...

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Autores principales:	Ben Esse, Michael Burton, Matthew Varnam, Ryunosuke Kazahaya, Paul A. Wallace, Felix Von-Aulock, Yan Lavallée, Giuseppe Salerno, Simona Scollo, Hugh Coe
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Depolarisation Images Main Plume Santiaguito Volcano Mild Explosive Activity Settling Velocity Medicine R Science Q
Acceso en línea:	https://doaj.org/article/3ee0f01acbfc4ebc8e901965f7b48bee
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id	oai:doaj.org-article:3ee0f01acbfc4ebc8e901965f7b48bee
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spelling	oai:doaj.org-article:3ee0f01acbfc4ebc8e901965f7b48bee2021-12-02T15:08:56ZQuantification of ash sedimentation dynamics through depolarisation imaging with AshCam10.1038/s41598-018-34110-62045-2322https://doaj.org/article/3ee0f01acbfc4ebc8e901965f7b48bee2018-10-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-34110-6https://doaj.org/toc/2045-2322Abstract Even modest ash-rich volcanic eruptions can severely impact a range of human activities, especially air travel. The dispersal of ash in these eruptions depends critically on aggregation and sedimentation processes – however these are difficult to quantify in volcanic plumes. Here, we image ash dynamics from mild explosive activity at Santiaguito Volcano, Guatemala, by measuring the depolarisation of scattered sunlight by non-spherical ash particles, allowing the dynamics of diffuse ash plumes to be investigated with high temporal resolution (>1 Hz). We measure the ash settling velocity downwind from the main plume, and compare it directly with ground sampled ash particles, finding good agreement with a sedimentation model based on particle size. Our new, cost-effective technique leverages existing technology, opening a new frontier of integrated ash visualisation and ground collection studies which could test models of ash coagulation and sedimentation, leading to improved ash dispersion forecasts. This will provide risk managers with improved data quality on ash location, reducing the economic and societal impacts of future ash-rich eruptions.Ben EsseMichael BurtonMatthew VarnamRyunosuke KazahayaPaul A. WallaceFelix Von-AulockYan LavalléeGiuseppe SalernoSimona ScolloHugh CoeNature PortfolioarticleDepolarisation ImagesMain PlumeSantiaguito VolcanoMild Explosive ActivitySettling VelocityMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-9 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Depolarisation Images Main Plume Santiaguito Volcano Mild Explosive Activity Settling Velocity Medicine R Science Q
spellingShingle	Depolarisation Images Main Plume Santiaguito Volcano Mild Explosive Activity Settling Velocity Medicine R Science Q Ben Esse Michael Burton Matthew Varnam Ryunosuke Kazahaya Paul A. Wallace Felix Von-Aulock Yan Lavallée Giuseppe Salerno Simona Scollo Hugh Coe Quantification of ash sedimentation dynamics through depolarisation imaging with AshCam
description	Abstract Even modest ash-rich volcanic eruptions can severely impact a range of human activities, especially air travel. The dispersal of ash in these eruptions depends critically on aggregation and sedimentation processes – however these are difficult to quantify in volcanic plumes. Here, we image ash dynamics from mild explosive activity at Santiaguito Volcano, Guatemala, by measuring the depolarisation of scattered sunlight by non-spherical ash particles, allowing the dynamics of diffuse ash plumes to be investigated with high temporal resolution (>1 Hz). We measure the ash settling velocity downwind from the main plume, and compare it directly with ground sampled ash particles, finding good agreement with a sedimentation model based on particle size. Our new, cost-effective technique leverages existing technology, opening a new frontier of integrated ash visualisation and ground collection studies which could test models of ash coagulation and sedimentation, leading to improved ash dispersion forecasts. This will provide risk managers with improved data quality on ash location, reducing the economic and societal impacts of future ash-rich eruptions.
format	article
author	Ben Esse Michael Burton Matthew Varnam Ryunosuke Kazahaya Paul A. Wallace Felix Von-Aulock Yan Lavallée Giuseppe Salerno Simona Scollo Hugh Coe
author_facet	Ben Esse Michael Burton Matthew Varnam Ryunosuke Kazahaya Paul A. Wallace Felix Von-Aulock Yan Lavallée Giuseppe Salerno Simona Scollo Hugh Coe
author_sort	Ben Esse
title	Quantification of ash sedimentation dynamics through depolarisation imaging with AshCam
title_short	Quantification of ash sedimentation dynamics through depolarisation imaging with AshCam
title_full	Quantification of ash sedimentation dynamics through depolarisation imaging with AshCam
title_fullStr	Quantification of ash sedimentation dynamics through depolarisation imaging with AshCam
title_full_unstemmed	Quantification of ash sedimentation dynamics through depolarisation imaging with AshCam
title_sort	quantification of ash sedimentation dynamics through depolarisation imaging with ashcam
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/3ee0f01acbfc4ebc8e901965f7b48bee
work_keys_str_mv	AT benesse quantificationofashsedimentationdynamicsthroughdepolarisationimagingwithashcam AT michaelburton quantificationofashsedimentationdynamicsthroughdepolarisationimagingwithashcam AT matthewvarnam quantificationofashsedimentationdynamicsthroughdepolarisationimagingwithashcam AT ryunosukekazahaya quantificationofashsedimentationdynamicsthroughdepolarisationimagingwithashcam AT paulawallace quantificationofashsedimentationdynamicsthroughdepolarisationimagingwithashcam AT felixvonaulock quantificationofashsedimentationdynamicsthroughdepolarisationimagingwithashcam AT yanlavallee quantificationofashsedimentationdynamicsthroughdepolarisationimagingwithashcam AT giuseppesalerno quantificationofashsedimentationdynamicsthroughdepolarisationimagingwithashcam AT simonascollo quantificationofashsedimentationdynamicsthroughdepolarisationimagingwithashcam AT hughcoe quantificationofashsedimentationdynamicsthroughdepolarisationimagingwithashcam
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Quantification of ash sedimentation dynamics through depolarisation imaging with AshCam

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