Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/13801
Authors: Aravena, Álvaro* 
Cioni, Raffaello* 
Bevilacqua, Andrea* 
de' Michieli Vitturi, Mattia* 
Esposti Ongaro, Tomaso* 
Neri, Augusto* 
Title: Tree‐Branching‐Based Enhancement of Kinetic Energy Models for Reproducing Channelization Processes of Pyroclastic Density Currents
Journal: Journal of Geophysical Research: Solid Earth 
Series/Report no.: / 125 (2020)
Publisher: Wiley Agu
Issue Date: 2020
DOI: 10.1029/2019JB019271
Keywords: Pyroclastic Density Currents
Numerical Modeling
Subject Classification04.08. Volcanology 
Abstract: Kinetic energy models, also called kinetic models, are simple tools able to provide a fast estimate of the inundation area of pyroclastic density currents (PDCs). They are based on the calculation of the PDC front kinetic energy as a function of the distance from a source point. On a three‐dimensional topography, the PDC runout distance is estimated by comparing the flow kinetic energy with the potential energy associated with the topographic obstacles encountered by the PDC. Since kinetic models do not consider the occurrence of channelization processes, the modeled inundation areas can be significantly different from those observed in real deposits. To address this point, we present a new strategy that allows improving kinetic models by considering flow channelization processes, and consists in the inclusion of secondary source points in the expected channelization zones, adopting a tree branch‐like structure. This strategy is based on the redistribution of a key physical variable, such as the flow energy or mass depending on the considered kinetic model, and requires the adoption of appropriate equations for setting the characteristics of the secondary sources. Two models were modified by applying this strategy: the energy cone and the box model. We tested these branching models by comparing their results with those derived from their traditional formulations and from a two‐dimensional depth‐averaged model, considering two specific volcanoes (Chaitén and Citlaltépetl). Thereby, we show the capability of this strategy of improving the accuracy of kinetic models and considering flow channelization processes without including additional, unconstrained input parameters.
Appears in Collections:Article published / in press

Files in This Item:
File Description SizeFormat
aravenatree.pdf10.96 MBAdobe PDFView/Open
Show full item record

WEB OF SCIENCETM
Citations

1
checked on Feb 10, 2021

Page view(s)

921
checked on Mar 27, 2024

Download(s)

4
checked on Mar 27, 2024

Google ScholarTM

Check

Altmetric