Synthetic benchmarking of concentrated pyroclastic current models

Autor: Anne Mangeney, Valentin Gueugneau, M. de' Michieli Vitturi, T. Esposti Ongaro, Marc Peruzzetto, Karim Kelfoun, François Bouchut, Sylvain J. Charbonnier, A. Patra
Přispěvatelé: School of Geosciences, University of South Florida, Florida, Tampa, USA, University of South Florida [Tampa] (USF), Istituto Nazionale di Geofisica e Vulcanologia – Sezione di Pisa (INGV), Istituto Nazionale di Geofisica e Vulcanologia, State University of New York [Buffalo], Institut de Physique du Globe de Paris (IPGP), Institut national des sciences de l'Univers (INSU - CNRS)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), Laboratoire Analyse et Mathématiques Appliquées (LAMA), Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Université Gustave Eiffel, Computational Data Science and Engineering, University of Buffalo, Laboratoire Magmas et Volcans (LMV), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Recherche pour le Développement et la société-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), Institut de Physique du Globe de Paris (IPGP (UMR_7154))
Jazyk: angličtina
Rok vydání: 2021
Předmět:
Zdroj: Bulletin of Volcanology
Bulletin of Volcanology, Springer Verlag, 2021, 83 (11), pp.75. ⟨10.1007/s00445-021-01491-y⟩
Bulletin of Volcanology, 2021, 83 (11), pp.75. ⟨10.1007/s00445-021-01491-y⟩
ISSN: 0258-8900
1432-0819
Popis: International audience; Validation and benchmarking of pyroclastic current (PC) models is required to evaluate their performance and their reliability for hazard assessment. Here we present results of a benchmarking initiative built to evaluate four models commonly used to assess concentrated PC hazard: SHALTOP, TITAN2D, VolcFlow and IMEX_SfloW2D. The benchmark focuses on the simulation of channelized flows with similar source conditions over five different synthetic channel geometries: 1) a flat incline plane, 2) a channel with a sharp 45° bend, 3) a straight channel with a break-in-slope, 4) a straight channel with an obstacle, and 5) a straight channel with a constriction. Several outputs from 60 simulations using three different initial volume fluxes were investigated to evaluate the performance of the four models when simulating valley-confined PC kinematics, including overflows induced by topographic changes. Quantification of the differences obtained between model outputs at t = 100 s allowed us to identify: 1) issues with the Voellmy-Salm implementation of TITAN2D and 2) small discrepancies between the three other codes that are either due to various curvature and velocity formulations and/or numerical frameworks. Benchmark results were also in agreement with field observations of natural PCs: a sudden change in channel geometries combined with a high-volume flux are keys to generate overflows. The synthetic benchmarks proved to be useful for evaluating model performance, needed for PCs hazard assessment. The overarching goal is to provide an interpretation framework for volcanic mass flow hazard assessment studies to the geoscience community.
Databáze: OpenAIRE
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