Laboratory and Numerical Modeling of a Lava Flow Analogue: A Comparative Analysis

Volcanic eruptions can bring about lava flows, posing significant hazards and rare direct threats to human life, but they can also cause extensive damage to property and economic activities. Managing volcanic disasters demands swift and accurate information on the behaviour and evolution of lava flo...

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Bibliographic Details
Published in:Journal of volcanology and seismology 2024, Vol.18 (4), p.397-406
Main Authors: Bokharaeian, Mahsa, Csámer, Árpád
Format: Article
Language:English
Subjects:
Comparative analysis
Disasters
Earth and Environmental Science
Earth Sciences
Economic activities
Flow velocity
Fluid flow
Geochemistry
Geology
Geophysics/Geodesy
Hydrodynamics
Information management
Laboratories
Laboratory experimentation
Laboratory experiments
Lava
Lava flows
Low temperature
Mathematical models
Modelling
Numerical models
Numerical simulations
Parameters
Property damage
Smooth particle hydrodynamics
Threat evaluation
Time dependence
Time measurement
Volcanic activity
Volcanic eruptions
Volcanoes
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Summary:Volcanic eruptions can bring about lava flows, posing significant hazards and rare direct threats to human life, but they can also cause extensive damage to property and economic activities. Managing volcanic disasters demands swift and accurate information on the behaviour and evolution of lava flows, particularly regarding their extension, displacement, and trajectory. This study addresses numerical and laboratory modelling to understand the dynamics of a lava flow and its frontal advancement. Laboratory experiments of a lava flow analogue, exhibiting a non-Newtonian Herschel–Bulkley fluid behaviour, have been conducted. The fluid parameters at varying temperatures have been determined on the basis of the rheometer and thermal camera measurements. A flow of the Herschel–Bulkley fluid (the lava flow analogue with the fluid parameters determined from the laboratory experiments) is then simulated numerically using the Abaqus software, where a smoothed particle hydrodynamics method has been implemented. A run-out distance, frontal flow displacement, and flow velocity have been determined during laboratory and numerical modelling. When the fluid parameters measured at a constant temperature of 80°C are used, the numerical results diverge from the experimental results over time. To mimic closely the dynamics of the lava flow analogue inferred from the laboratory experiment with its dynamics in the numerical modelling, time-dependent adjustments to the Herschel–Bulkley fluid parameters determined at lower temperatures have been introduced by changing their values during a numerical simulation. This study underscores the importance of constraining parameters of numerical models by the values obtained from laboratory measurements.
ISSN:0742-0463
1819-7108
DOI:10.1134/S0742046324700623