Identifying rheological regimes within pyroclastic density currents
| dc.citation.articleNumber | 4401 | en_US |
| dc.citation.journalTitle | Nature Communications | en_US |
| dc.citation.volumeNumber | 15 | en_US |
| dc.contributor.author | Jones, Thomas J. | en_US |
| dc.contributor.author | Shetty, Abhishek | en_US |
| dc.contributor.author | Chalk, Caitlin | en_US |
| dc.contributor.author | Dufek, Josef | en_US |
| dc.contributor.author | Gonnermann, Helge M. | en_US |
| dc.date.accessioned | 2024-08-09T16:25:26Z | en_US |
| dc.date.available | 2024-08-09T16:25:26Z | en_US |
| dc.date.issued | 2024 | en_US |
| dc.description.abstract | Pyroclastic density currents (PDCs) are the most lethal of all volcanic hazards. An ongoing challenge is to accurately forecast their run-out distance such that effective mitigation strategies can be implemented. Central to this goal is an understanding of the flow mobility—a quantitative rheological model detailing how the high temperature gas-pyroclast mixtures propagate. This is currently unknown, yet critical to accurately forecast the run-out distance. Here, we use a laboratory apparatus to perform rheological measurements on real gas-pyroclast mixtures at dynamic conditions found in concentrated to intermediate pumice-rich PDCs. We find their rheology to be non-Newtonian featuring (i) a yield stress where deposition occurs; (ii) shear-thinning behavior that promotes channel formation and local increases in velocity and (iii) shear-thickening behavior that promotes decoupling and potential co-PDC plume formation. We provide a universal regime diagram delineating these behaviors and illustrating how flow can transition between them during transport. | en_US |
| dc.identifier.citation | Jones, T. J., Shetty, A., Chalk, C., Dufek, J., & Gonnermann, H. M. (2024). Identifying rheological regimes within pyroclastic density currents. Nature Communications, 15(1), 4401. https://doi.org/10.1038/s41467-024-48612-7 | en_US |
| dc.identifier.digital | s41467-024-48612-7 | en_US |
| dc.identifier.doi | https://doi.org/10.1038/s41467-024-48612-7 | en_US |
| dc.identifier.uri | https://hdl.handle.net/1911/117640 | en_US |
| dc.language.iso | eng | en_US |
| dc.publisher | Springer Nature | en_US |
| dc.rights | Except where otherwise noted, this work is licensed under a Creative Commons Attribution (CC BY) license. Permission to reuse, publish, or reproduce the work beyond the terms of the license or beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder. | en_US |
| dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | en_US |
| dc.title | Identifying rheological regimes within pyroclastic density currents | en_US |
| dc.type | Journal article | en_US |
| dc.type.dcmi | Text | en_US |
| dc.type.publication | publisher version | en_US |
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