Modeling of the steady-state temperature field in lava flow levées

Quareni, Francesca; Tallarico, Andrea; Dragoni, Michele

doi:10.1016/s0377-0273(03)00348-2

Cited by 16 publications

(16 citation statements)

References 10 publications

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“…Lava heat is released in the atmosphere from the core of an active flow by conduction through the basal, lateral, and surface crusts [Oppenheimer, 1991;Klingelhofer et al, 1999;Quareni et al, 2004]. At the surface, heat losses are dominated by radiation (5 × 10 4 W m −2 ) and convection (10 4 W m −2 ), whereas conduction from the base to the ground is predominant (10 3 W m −2 [Harris et al, 2005]).…”

Section: Heat Flow Estimationmentioning

confidence: 99%

Modeling the lava heat flux during severe effusive volcanic eruption: An important impact on surface air quality

Durand

Tulet

Leriche

et al. 2014

J. Geophys. Res. Atmos.

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The Reunion Island experienced its biggest eruption of Piton de la Fournaise Volcano during April 2007. Known as the eruption of the century, this event degassed more than 230 kt of SO 2 . Theses emissions led to important health issues, accompanied by environmental and infrastructure degradations. This modeling study uses the mesoscale chemical model MesoNH-C to simulate the transport of gaseous SO 2 between 2 and 7 April, with a focus on the influence of heat fluxes from lava. This study required the implementation of a reduced chemical scheme, a basic surface model, and an estimation of lava heat fluxes in the atmospheric model. The model was able to reproduce general trends of this eruption, in particular the crossing of trade wind inversion, the SO 2 surface concentration (with highest peak of SO 2 of 600 μg m −3 observed on 4 April for western Reunion locations), and the wet deposition associated to rainfall. A sensitivity study shows that without heat fluxes over the vent and the lava flow, simulated SO 2 surface concentration are up to 45 times higher than observed.

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Section: Heat Flow Estimationmentioning

confidence: 99%

Modeling the lava heat flux during severe effusive volcanic eruption: An important impact on surface air quality

Durand

Tulet

Leriche

et al. 2014

J. Geophys. Res. Atmos.

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“…Such channeled flows leaving a levee‐channel morphology in deposits on the slope are also observed in very different environments and for flows involving completely different materials such as landslide deposits on Mars [ Mangold et al , 2003; Treiman and Louge , 2004] or submarine landslides [ Klaucke et al , 2004]. Although lava flows have a totally different mechanical behavior, similar morphological features are observed in their deposits [ Sakimoto and Gregg , 2001; Quareni et al , 2004].…”

Section: Introductionmentioning

confidence: 99%

“…Several explanations have been proposed for the channeling of these unconfined flows and their levee‐channel morphology: Bingham rheology leading to lateral static zones as is the case for lava flows [ Yamamoto et al , 1993; Quareni et al , 2004; Mangold et al , 2003], drainage of the central part of the deposit with static levees [ Rowley et al , 1981] and differential deflation and differential fluidization of borders during emplacement due to polydispersity of the particles [ Rowley et al , 1981; Wilson and Head , 1981]. The levee‐channel morphology observed on Martian landslides was first interpreted as indicating the presence of water during emplacement [ Malin and Edgett , 2000].…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling of self‐channeling granular flows and of their levee‐channel deposits

et al. 2007

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[1] When not laterally confined in valleys, pyroclastic flows create their own channel along the slope by selecting a given flowing width. Furthermore, the lobe-shaped deposits display a very specific morphology with high parallel lateral levees. A numerical model based on Saint Venant equations and the empirical variable friction coefficient proposed by Pouliquen and Forterre (2002) is used to simulate unconfined granular flow over an inclined plane with a constant supply. Numerical simulations successfully reproduce the self-channeling of the granular lobe and the levee-channel morphology in the deposits without having to take into account mixture concepts or polydispersity. Numerical simulations suggest that the quasi-static shoulders bordering the flow are created behind the front of the granular material by the rotation of the velocity field due to the balance between gravity, the two-dimensional pressure gradient, and friction. For a simplified hydrostatic model, competition between the decreasing friction coefficient and increasing surface gradient as the thickness decreases seems to play a key role in the dynamics of unconfined flows. The description of the other disregarded components of the stress tensor would be expected to change the balance of forces. The front's shape appears to be constant during propagation. The width of the flowing channel and the velocity of the material within it are almost steady and uniform. Numerical results suggest that measurement of the width and thickness of the central channel morphology in deposits in the field provides an estimate of the velocity and thickness during emplacement.

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“…Pluton emplacement has been modelled as a large body of viscous fluid which plastically deforms its surroundings, and experiments have focussed on pluton geometry and how space is accommodated in the lithosphere. Perhaps one of the earliest analogue experiments to study granitic pluton emplacement was carried out by Ramberg (1970), who used a combination of clay, putties, wax-oil mixtures, plates of concrete, and aqueous solutions to simulate diapiric ascent of fluid-like magmas through rock layers with differing competency (see Tables 1 and 2). In his experiments, Ramberg used a centrifuge model arrangement capable of reaching an acceleration of 4000 × g. Roman-Berdiel et al (1997) and Roman-Berdiel (1999) studied granite emplacement by injecting low-viscosity Newtonian silicone putty into a tank of sand.…”

Section: Magma Chamber To Plutonmentioning

confidence: 99%

“…Lava flow numerical models have been used to simulate edifice growth from the accumulation of multiple lava flows (Annen et al, 2001), the insulating properties of lava tubes (Keszthelyi, 1995), cooling of pahoehoe lavas (Keszthelyi and Denlinger, 1996), and formation of lava levees (Quareni et al, 2004), and from a hazard perspective, flow length, rates of emplacement, and inundation areas. For hazard and risk assessment purposes, simulated lava flows are emplaced over a digital elevation model to predict the inundation pathways of flows.…”

Section: Application Of Numerical Lava Flow Modelsmentioning

confidence: 99%

A review of laboratory and numerical modelling in volcanology

Kavanagh¹,

Engwell²,

Martin³

2018

Solid Earth

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Abstract. Modelling has been used in the study of volcanic systems for more than 100 years, building upon the approach first applied by Sir James Hall in 1815. Informed by observations of volcanological phenomena in nature, including eyewitness accounts of eruptions, geophysical or geodetic monitoring of active volcanoes, and geological analysis of ancient deposits, laboratory and numerical models have been used to describe and quantify volcanic and magmatic processes that span orders of magnitudes of time and space. We review the use of laboratory and numerical modelling in volcanological research, focussing on sub-surface and eruptive processes including the accretion and evolution of magma chambers, the propagation of sheet intrusions, the development of volcanic flows (lava flows, pyroclastic density currents, and lahars), volcanic plume formation, and ash dispersal.When first introduced into volcanology, laboratory experiments and numerical simulations marked a transition in approach from broadly qualitative to increasingly quantitative research. These methods are now widely used in volcanology to describe the physical and chemical behaviours that govern volcanic and magmatic systems. Creating simplified models of highly dynamical systems enables volcanologists to simulate and potentially predict the nature and impact of future eruptions. These tools have provided significant insights into many aspects of the volcanic plumbing system and eruptive processes. The largest scientific advances in volcanology have come from a multidisciplinary approach, applying developments in diverse fields such as engineering and computer science to study magmatic and volcanic phenomena. A global effort in the integration of laboratory and numerical volcano modelling is now required to tackle key problems in volcanology and points towards the importance of benchmarking exercises and the need for protocols to be developed so that models are routinely tested against "real world" data.

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Modeling of the steady-state temperature field in lava flow levées

Cited by 16 publications

References 10 publications

Modeling the lava heat flux during severe effusive volcanic eruption: An important impact on surface air quality

Modeling the lava heat flux during severe effusive volcanic eruption: An important impact on surface air quality

Numerical modeling of self‐channeling granular flows and of their levee‐channel deposits

A review of laboratory and numerical modelling in volcanology

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