A5007514280- Geological and Geochemical Analysis
- Geology and Paleoclimatology Research
- earthquake and tectonic studies
- Meteorological Phenomena and Simulations
- Wind and Air Flow Studies
- Aeolian processes and effects
- Particle Dynamics in Fluid Flows
- Atmospheric and Environmental Gas Dynamics
- Fluid Dynamics and Turbulent Flows
- Earthquake Detection and Analysis
- Climate variability and models
- Atmospheric aerosols and clouds
- Aerodynamics and Acoustics in Jet Flows
- Maritime and Coastal Archaeology
- Cryospheric studies and observations
- Geological formations and processes
- Geochemistry and Geologic Mapping
- Pacific and Southeast Asian Studies
- Landslides and related hazards
- Tropical and Extratropical Cyclones Research
- Archaeology and ancient environmental studies
- Oceanographic and Atmospheric Processes
- Geological Modeling and Analysis
- Geological and Geophysical Studies
- Methane Hydrates and Related Phenomena
Institut de physique du globe de Paris
2015-2025
Université Paris Cité
2014-2024
Centre National de la Recherche Scientifique
2008-2024
Sorbonne Paris Cité
2013-2019
Laboratoire de Dynamique des Fluides
2008-2018
Délégation Paris 7
2012-2016
Centre Hospitalier Universitaire de Martinique
2015
University of British Columbia
2010-2013
Explosive volcanic jets present an unusual dynamic situation of reversing buoyancy. Their initially negative buoyancy with respect to ambient fluid first opposes the motion, but can change sign drive a convective plume if sufficient amount entrainment occurs. The key unknown is behaviour for initial flow regime in which acts against momentum jet. To describe and constrain this regime, we experimental study into turbulent Using original technique based on influence injection radius threshold...
The description of entrainment in turbulent free jets is at the heart physical models some major flows environmental science, from volcanic plumes to dispersal pollutant wastes. classical approach relies on assumption complete self-similarity flows, which allows a simple parameterization dynamical variables terms constant scaling factors, but this hypothesis remains under debate. We use paper an original and extensive review published experimental data interpret discrepancy between...
Eruptive column models are powerful tools for investigating the transport of volcanic gas and ash, reconstructing past explosive eruptions, simulating future hazards. However, evaluation these is challenging as it requires independent estimates main model inputs (e.g. mass eruption rate) outputs height). There exists no database independently estimated source parameters (ESPs) that extensive, standardized, maintained, consensus-based. This paper introduces Independent Volcanic Eruption...
The maximum height reached by a turbulent plume rising in stratified environment is key tool to estimate the flux released at its source, particularly for large‐scale flows because can often be very hard measure directly. This known mainly controlled stratification of ambient fluid, source buoyancy flux, and efficiency mixing between external fluid. latter effect has been only superficially explored spite fundamental control on dynamics. Here we show that commonly used one‐dimensional models...
Abstract Rapid and simple estimation of the mass eruption rate (MER) from column height is essential for real‐time volcanic hazard management reconstruction past explosive eruptions. Using 134 eruptive events new Independent Volcanic Eruption Source Parameter Archive (IVESPA, v1.0), we explore empirical MER‐height relationships four measures height: spreading level, sulfur dioxide height, top direct observations as reconstructed deposits. These show significant differences highlight...
Understanding the longevity of volcanic ash‐clouds generated by powerful explosive eruptions is a long standing problem for assessing hazards and nature time scale forcings on climate change. It well known that lateral spreading these clouds influenced stratospheric winds, particle settling turbulent diffusion. Observations recent 2010 Eyjafjallajökull 2011 Grimsvötn umbrella clouds, as structure atmospheric aerosol from 1991 Mt Pinatubo event, suggest an additional key process governing...
Abstract The mass eruption rate feeding a volcanic plume is commonly estimated from its maximum height. Winds are known to affect the column dynamics causing bending and hence reducing height for given rate. However, quantitative predictions including wind effects on estimates not well constrained. To fill this gap, we present series of new laboratory experiments forced plumes rising in density‐stratified crossflow. We identify three dynamical regimes corresponding increasing effect rise....
The Mount Pelée May 8th, 1902 eruption is responsible for the deaths of more than 29,000 people, as well nearly-complete destruction city Saint Pierre by a single pyroclastic current, and is, sadly, deadliest 20th century. Despite intensive field studies on associated deposits, eruptive sequence generation current its internal dynamics are still debated. This study takes different approach developing numerical simulations 8, event using two-phase version VolcFlow to model both concentrated...
Recent historical eruptions such as Eyjafjallajökull 2010, La Palma 2018, and even the Hunga Tunga Ha'apai events in 2022 have highlighted far-reaching impacts of volcanic plumes, including disruptions to air travel, infrastructure damage, potential health consequences. These were highly documented with direct observations near real-time measurements, allowing scientists local authorities act rapidly. Highly active volcanoes are being monitored, Etna, Stromboli, Hekla, Piton de la...
Turbulent fountains are of major interest for many natural phenomena and industrial applications, can be considered as one the canonical examples turbulent flows. They have been object extensive experimental theoretical studies that yielded scaling laws describing behaviour a function source conditions (namely their Reynolds Froude numbers). However, although such provide clear understanding basic dynamics fountains, they usually rely on more or less ad hoc dimensionless proportionality...
Abstract Predictions for the heights and downwind trajectories of volcanic plumes using integral models are critical assessment risks climate impacts explosive eruptions but strongly influenced by parameterizations turbulent entrainment. We compare four popular small scale laboratory experiments spanning large range dynamical regimes in which occur. reduce uncertainties on wind entrainment coefficient β quantifies contribution wind‐driven radial velocity shear to is a major source...