Field-based measurements of volcanic ash resuspension by wind
| Autor: | Tullio Ricci, Keld Rømer Rasmussen, J. J. Iversen, E. Del Bello, Jacopo Taddeucci, Daniele Andronico, Piergiorgio Scarlato, Jonathan Merrison |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
010504 meteorology & atmospheric sciences
Cordon Caulle volcano Mineralogy wind tunnel 010502 geochemistry & geophysics 01 natural sciences Geochemistry and Petrology Wind shear volcanic ash Earth and Planetary Sciences (miscellaneous) Field based Shear velocity Sakurajima volcano 0105 earth and related environmental sciences Wind tunnel geography geography.geographical_feature_category wind resuspension Grain size Geophysics Volcano detachment threshold Space and Planetary Science Particle Geology Volcanic ash |
| Zdroj: | Del Bello, E, Taddeucci, J, Merrison, J P, Rasmussen, K R, Andronico, D, Ricci, T, Scarlato, P & Iversen, J J 2021, ' Field-based measurements of volcanic ash resuspension by wind ', Earth and Planetary Science Letters, vol. 554, 116684 . https://doi.org/10.1016/j.epsl.2020.116684 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|