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Field-based measurements of volcanic ash resuspension by wind

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  • E. Del Bello, Ist Nazl Geofis & Vulcanol, Istituto Nazionale Geofisica e Vulcanologia (INGV), Sez Roma 1
  • ,
  • J. Taddeucci, Ist Nazl Geofis & Vulcanol, Istituto Nazionale Geofisica e Vulcanologia (INGV), Sez Roma 1
  • ,
  • Jonathan P. Merrison
  • Keld Rømer Rasmussen
  • D. Andronico, Istituto Nazionale di Geofisicae Vulcanologia, Sezione di Catania, Osservatorio Etneo, Piazza Roma 2, 95125, Catania, Italy
  • ,
  • T. Ricci, Istituto Nazionale di Geofisica e Vulcanologia (INGV),Rome
  • ,
  • P. Scarlato, Ist Nazl Geofis & Vulcanol, Istituto Nazionale Geofisica e Vulcanologia (INGV), Sez Roma 1
  • ,
  • Jens Jacob Iversen

The resuspension of volcanic ash by wind is a significant source of hazard during and after volcanic eruptions. Parameterizing and modeling ash resuspension requires direct measurement of the minimum wind shear stress required to move particles, usually expressed as the threshold friction velocity U th, a parameter that, for volcanic ash, has been measured only scarcely and always in the laboratory. Here, we report the first field measurements of U th for volcanic ash, with a portable wind tunnel specifically developed, calibrated, and tested. Field measurements, performed on natural reworked ash deposits from Sakurajima (Japan) and Cordón Caulle (Chile) volcanoes, agree well with our laboratory determinations on ash from the same deposits, with values of U th ranging from 0.13 to 0.38 m/s. Our results show that the median grain size of the deposit and particle shape have a stronger control on U th than the local substratum nature and deposit texture.

OriginalsprogEngelsk
Artikelnummer116684
TidsskriftEarth and Planetary Science Letters
Vol/bind554
Antal sider9
ISSN0012-821X
DOI
StatusUdgivet - jan. 2021

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