28 April at 16h30 - GEO at EAIFR webinar “Ash clouds and lava flows: modelling volcanic hazards” - Prof. A. Hogg, School of Mathematics, U. Bristol, UK

[Henningsen Susanne]

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Dear All,

The East African Institute for Fundamental Research (EAIFR) and the 
International Centre for Theoretical Physics (ICTP) wish to inform those 
who may be interested of a GEO at EAIFR webinar. This seminar will take 
place Thursday 28 April at 16h30 (Kigali time) and will be broadcast 
live on ZOOM. It will also be recorded and later posted on the 
ICTP-EAIFR YouTube channel 
<https://www.youtube.com/channel/UCgqU4uHGei8OD3bkPgEbaqQ/videos?view=57>, 
where one can find the previous recorded GEO at EAIFR webinars. Below all 
the details:

*Speaker:* Professor Andrew Hogg 
<https://research-information.bris.ac.uk/en/persons/andrew-j-hogg> from 
the School of Mathematics, University of Bristol, United Kingdom

*Title:* Ash clouds and lava flows: modelling volcanic hazards

*When:* 28 April at 16h30 (Kigali time/Rome time)

*Register* in advance for this meeting by clicking here 
<https://us02web.zoom.us/meeting/register/tZArd-2hqz8iGdDvWzOY7itfOIJ6xNAo_paj>.


*Biography:*

Trained as a mathematician at University of Cambridge for both 
undergraduate and postgraduate studies, completing a thesis under the 
supervision of Prof. Herbert Huppert. Appointed as a Lecturer in applied 
mathematics at University of Bristol, and now a Professor of Fluid 
Mechanics at the same institution.

I have worked on a number of multiphase fluid dynamical problems, 
motivated by large-scale environmental phenomena. These studies  include 
the dynamics of snow avalanches, sediment transport and debris flows.


*Abstract:*

Volcanic activity poses many potent hazards to lives and livelihoods and 
in this seminar I will present some mathematical models of the 
large-scale, multiphase flows that arise. Particular focus will be given 
to two distinct problems: the rise through the atmosphere of ash-laden 
volcanic plumes; and the interaction of volcanic lava flows with 
topography and obstacles.

In 2010, the eruption Eyjafjallajokull (Iceland) brought air traffic to 
a standstill for several weeks as the ash-laden plume drifted across 
northern European airspace.  Modellers were ill-equipped to quantify the 
atmospheric concentrations of ash and direct measurements were 
unavailable.  The research results presented here tackle part of this 
problem by developing a model for the rise and intrusion of the plume 
from the vent through the atmosphere to allow the source strength, and 
thus the concentration of ash to be deduced from measurements of the 
height of rise and properties of the atmosphere.

The very recent eruption on La Palma (Canary Islands, 2021) has shown 
that effusive volcanic activity that produces lava flows can be 
long-lived, damage infrastructure and require evacuations from inundated 
regions.  These relatively slow-moving flows are gravitationally-driven 
and steered by topography.  When they encounter obstacles, they are 
deflected but form relatively deep, upstream pools of fluid. 
Quantitative results of models of these flows and interactions will be 
presented.

All are welcome.

Best Regards from Catherine Meriaux and Abdelkrim Aoudia.

PS: for further information, do not hesitate to contact Catherine 
Meriaux (cmeriaux at eaifr.org <mailto:cmeriaux at eaifr.org>)



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