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Crust Development inferred from numerical models of LA V A flow and its surface thermal measurements

Tsepelev, Igor; Ismail-Zadeh, Alik; Starodubtseva, Yulia; Korotkii, Alexander; Melnik, Oleg

Propagation of a lava flow is governed by slope topography, magma rheology, heat exchange with the atmosphere and the underlying terrain, and the rate of the eruption. Highly viscous crust is formed due to cooling and solidification of the uppermost layer of the flow. We consider here two numerical model problems for lava flows, both based on the fundamental physics of a hot fluid flow: a model problem, where thermal conditions (e.g. temperature and heat flow) at the lava surface are unknown a priori (a direct model problem), and a model problem, where the lava surface conditions are known and determined from observations(an inverse model problem). In both models, the lava viscosity depends on temperature and the volume fraction of crystals. By way of solving the direct model problem, we perform a parametric study of steady state lava flows to investigate the influence of the heat flux, viscosity, and effusion rate on the lava crust development. Numerical experiments show that a lava crust becomes thicker in the case of the nonlinear heat transfer compared to the case of a linear heat flow at the interface of lava with the atmosphere. ... mehr

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DOI: 10.4401/ag-7745
Zitationen: 3
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 02.2018
Sprache Englisch
Identifikator ISSN: 2037-416X, 1593-5213
KITopen-ID: 1000098877
HGF-Programm 35.14.01 (POF III, LK 01) Effiziente Nutzung geothermisch. Energie
Erschienen in Annals of geophysics
Verlag Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Band 61
Seiten AC62
Bemerkung zur Veröffentlichung Special Issue: MeMoVolc
Schlagwörter lava crust; nonlinear heat flow; lava rheology; numerical modelling; data assimilation
Nachgewiesen in Dimensions
Web of Science
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