 Sébastien VALADE
Function: Post doctoral research fellow Main Research Unit: LMV E-mail: |
Presentation
During his postdoctoral fellowship with ClerVolc in 2012-2014, Sébastien used infrared cameras to study the dynamics of small scale ash plumes. A freeware (plumeTracker) was designed to track and analyze the plumes through time, and to extract descriptive parameters such as ascent velocities, volume, spreading rate, air entrainment coefficient, heat budget, ash mass loading, etc… With Matteo Cerminara from INGV Pisa, he reconstructed synthetic two-dimensional thermal images of volcanic plumes from analytical one-dimensional models. These were then compared with, and fitted to, thermal images of real plumes in order to recover the best input parameters, such as the source ash mass, particle size distribution and air entrainment coefficient.
ClerVolc Publications
396. Sainlot N., Vlastélic I., Moune S., Rose-Koga E., Schiavi F., Valade S., Aguilera F. (2020). Uptake of gaseous thallium, tellurium, vanadium and molybdenum into anhydrous alum, Lascar volcano fumaroles, Chile. Geochimica et Cosmochimica Acta vol.275, p.64-82, 10.1016/j.gca.2020.02.009 (ed.).
392. Freret-Lorgeril V., Gilchrist J., Donnadieu F., Jellinek A.M., Delanoë J., Latchimy T., Vinson J.P., Caudoux C., Peyrin F., Hervier C., Valade S. (2020). Ash sedimentation by fingering and sediment thermals from wind-affected volcanic plumes. Earth and Planetary Science Letters vol.534, p.116072, DOI:10.1016/j.epsl.2020.116072 .
146. Cerminara, M., Esposti Ongaro, T., Valade, S., Harris, A.J.L. (2015). Volcanic plume vent conditions retrieved from infrared images: A forward and inverse modeling approach, Journal of Volcanology and Geothermal Research, 129-147
117. Menard G., Moune S., Vlastélic I., Aguilera F., Valade S., Bontemps M., González R. (2014). Gas and aerosol emissions from Lascar volcano (Northern Chile): insights into the origin of gases and their links with the volcanic activity. Journal of Volcanology and Geothermal Research 287, 51-67. doi:10.1016/j.jvolgeores.2014.09.004
85. Valade S.A., Harris A., Cerminara M. (2014). Plume AscentTracker: Interactive Matlab software for analysis of ascending plumes in image data. Computers & Geosciences 66, 132-144. doi:10.1016/j.cageo.2013.12.015.
65 – Harris A.J.L., S. Valade, G. M. Sawyer, F. Donnadieu, J., Battaglia, L., Gurioli, K. Kelfoun, P. Labazuy, T. Stachowicz, M. Bombrun, V. Barra (2013). Modern Multispectral Sensors Help Track Explosive Eruptions. EOS, Transactions American Geophysical Union 94, 321-322. https://doi.org/10.1002/2013EO370001
3. Gouhier M., Harris A., Calvari S., Labazuy P., Guéhenneux Y., Donnadieu F., Valade S. (2012). Lava discharge during Etna’s January 2011 fire fountain tracked using MSG-SEVIRI. Bulletin of Volcanology vol.74, p.787-793, 4, doi:10.1007/s00445-011-0572-y.