Roche Olivier

Roche_Olivier

Chargé(e) de Recherche, IRD
Équipe de Volcanologie
Chargé de Recherche IRD
Bureau: 1.36 - LMV Cezeaux
Téléphone: 04.73.34.67.68
Courriel : Olivier.Roche@uca.fr

  • Thèmes de Recherche :

    Mise en place des écoulements pyroclastiques

    Mécanismes de propagation, d’érosion et de dépôt, pression de gaz interstitielle et interactions gaz-particules, processus de ségrégation des particules.

    Formation des calderas et éruptions associées

    Mécanismes de subsidence, dynamique des éruptions explosives.

    Eruptions basaltiques-andésitiques explosives

    Caractérisation des produits éruptifs, analyse des teneurs en volatiles.

    Avalanches de débris

    Déclenchement et mécanismes de propagation.

    Mécanismes d’érosion par les écoulements géophysiques

    Processus d’entrainement d’un substrat granulaire, effet sur la mobilité.

    Responsabilités scientifiques et administratives :

    2011- . Directeur Adjoint du Laboratoire Magmas et Volcans.
    2015- . Porteur du projet VIMESEA, Pilot coordination action ERANet-LAC Europe-Amérique latine, 7ème PCRDT.
    2014-2016. Coordinateur scientifique (avec D. Laporte) du projet Volcanisme basaltique explosif, financé par la Région Auvergne.
    2013- . Co-responsable de la Commission sur le Volcanisme Explosif de l’Association Internationale de Volcanologie.
    2012-2015. Coordinateur scientifique du programme Instabilités gravitaires et modélisation, Laboratoire Mixte International IRD Séismes et Volcans dans les Andes du Nord, Equateur (dir. J.L. Le Pennec).
    2012-2014 et 2007-2009. Coordinateur scientifique de projets Ecos-Conicyt (France-Chili).
    2011- . Coordinateur scientifique du programme Ecoulements volcaniques gravitaires du Laboratoire d’Excellence ClerVolc (Dir. P. Schiano).
    2008-2011. Porteur du projet ANR Jeunes Chercheurs VOLBIFLO.

    Informations diverses :

    Habilitation à Diriger les Recherches (2010), Université Blaise Pascal, Clermont-Ferrand.

    Prime d’Encadrement Doctorale et de Recherche de l’IRD (2014-2017).

    Collaborations internationales :

    Université du Chili à Santiago, Ingemmet (Pérou), Institut Géophysique Quito (Equateur), Université de Bristol (UK), State University of New-York at Buffalo (USA), Boise State University (USA), University of British Colombia (Canada), Université Ludwig Maximilian Munich (Allemagne), INGV Pise (Italie).

    Activités d’enseignement :

    Département des Sciences de la Terre, Université Blaise Pascal, Clermont-Ferrand

    Volcanologie, méthodologie scientifique, cartographie, sédimentologie, techniques de laboratoire (Licence, Master, préparation CAPES-Agrégation)

    Université du Chili, Santiago

    Volcanologie physique, dynamique des éruptions explosives (Master)

  • Publications LMV depuis 2010 (journal articles, book chapters, conference proceedings)

    Rang A :

    • Delannay R., Valance A., Mangeney A., Roche O., Richard P. (2017). Granular and particle-laden flows: from laboratory experiments to field observations. Journal of Physics D: Applied Physics vol.50, p.053001, doi:10.1088/1361-6463/50/5/053001.
    • Gueugneau V., Kelfoun K., Roche O., Chupin L. (2017). Effects of pore pressure in pyroclastic flows: Numerical simulation and experimental validation. Geophysical Research Letters vol.44, doi:10.1002/2017GL072591.
    • Lusso C., Ern A., Bouchut F., Mangeney A., Farin M., Roche O. (2017). Two-dimensional simulation by regularization of free surface viscoplastic flows with Drucker–Prager yield stress and application to granular collapse. Journal of Computational Physics vol.333, p.387-408, doi:10.1016/j.jcp.2016.12.036.
    • Castruccio A., Clavero J., Segura A., Samaniego P., Roche O., Le Pennec J.L., Droguett B. (2016). Eruptive parameters and dynamics of the April 2015 sub-Plinian eruptions of Calbuco volcano (southern Chile). Bulletin of Volcanology vol.78, p.62, doi:10.1007/s00445-016-1058-8.
    • Jessop D., Gilchrist J., Jellinek A.M., Roche O. (2016). Are eruptions from linear fissures and caldera ring dykes more likely to produce pyroclastic flows?. Earth and Planetary Science Letters vol.454, p.142-153, doi:10.1016/j.epsl.2016.09.005.
    • Jordan S., Le Pennec J.L., Gurioli L., Roche O., Boivin P. (2016). Highly explosive eruption of the monogenetic 8.6 ka BP La Vache et Lassolas scoria cone complex (Chaîne des Puys, France). Journal of Volcanology and Geothermal Research vol.313, p.15-28, doi:10.1016/j.jvolgeores.2015.12.006.
    • Montserrat S., Tamburrino A., Roche O., Niño Y., Ihle C.F. (2016). Enhanced run-out of dam-break granular flows caused by initial fluidization and initial material expansion. Granular Matter vol.18, p.11, doi:10.1007/s10035-016-0604-6.
    • Pollock N.M., Brand B.D., Roche O. (2016). The controls and consequences of substrate entrainment by pyroclastic density currents at Mount St Helens,Washington (USA). Journal of Volcanology and Geothermal Research vol.325, p.135-147, doi:10.1016/j.jvolgeores.2016.06.012.
    • Roche O., Buesch D.C., Valentine G.A. (2016). Slow-moving and far-travelled dense pyroclastic flows during the Peach Spring super-eruption. Nature Communications vol.7, p.10890, doi:10.1038/ncomms10890.
    • Valderrama P., Roche O., Samaniego P., Van Wyk De Vries B., Bernard K., Mariño J. (2016). Dynamic implications of ridges on a debris avalanche deposit at Tutupaca volcano (southern Peru). Bulletin of Volcanology vol.78, p.14, doi:10.1007/s00445-016-1011-x.
    • Chedeville C., Roche O. (2015). Influence of slope angle on pore pressure generation and kinematics of pyroclastic flows: insights from laboratory experiments. Bulletin of Volcanology vol.77, p.96, doi:10.1007/s00445-015-0981-4.
    • Dufek J., Esposti-Ongaro T., Roche O. (2015). Pyroclastic density currents: Processes and models. vol.chap 35, Encyclopedia of Volcanoes, Eds. H. Sigurdsson et al., Elsevier (ed.).
    • Girolami L., Druitt T., Roche O. (2015). Towards a quantitative understanding of pyroclastic flows: Effects of expansion on the dynamics of laboratory fluidized granular flows. Journal of Volcanology and Geothermal Research vol.296, p.31-39, doi:10.1016/j.jvolgeores.2015.03.008.
    • Gurioli L., Andronico D., Bachèlery P., Balcone-Boissard H., Battaglia J., Boudon G., Burgisser A., Burton M.R., Cashman K., Cichy S., Cioni R., Di Muro A., Dominguez L., D’Oriano C., Druitt T., Harris A., Hort M., Kelfoun K., Komorowski J.C., Kueppers U., Le Pennec J.L., Menand T., Paris R., Pioli L., Pistolesi M., Polacci M., Pompilio M., Ripepe M., Roche O., Rose-Koga E., Rust A., Schiavi F., Sharff L., Sulpizio R., Taddeucci J., Thordarson T. (2015). MeMoVolc consensual document: a review of cross-disciplinary approaches to characterizing small explosive magmatic eruptions. Bulletin of Volcanology vol.77, p.49, doi:10.1007/s00445-015-0935-x.
    • Ionescu I.R., Mangeney A., Bouchut F., Roche O. (2015). Viscoplastic modeling of granular column collapse with pressure-dependent rheology. Journal of Non-newtonian Fluid Mechanics vol.219, p.1-18, doi:10.1016/j.jnnfm.2015.02.006.
    • Roche O. (2015). Dispositif de mesure des contraintes basales d’un écoulement granulaire, Brevet déposé par l'IRD (au nom de l'IRD, de l'UBP et du CNRS) le 17/12/2014 à l’Institut National de la Propriété Industrielle, n° de demande : 1462666, n° de soumission 1000271163.
    • Roche O. (2015). Nature and velocity of pyroclastic density currents inferred from models of entrainment of substrate lithic clasts. Earth and Planetary Science Letters vol.418, p.115-125, doi:10.1016/j.epsl.2015.03.001.
    • Rodríguez I., Roche O., Moune S., Aguilera F., Campos E., Pizarro M. (2015). Evolution of Irruputuncu volcano, Central Andes, northern Chile. Journal of South American Earth Sciences vol.63, p.385-399, doi:10.1016/j.jsames.2015.08.012.
    • Samaniego P., Valderrama P., Mariño J., Van Wyk De Vries B., Roche O., Manrique N., Chedeville C., Fidel L., Malnati J. (2015). The historical (218 ± 14 aAP) explosive eruption of Tutupaca volcano (Southern Peru). Bulletin of Volcanology vol.77, p.51, doi:10.1007/s00445-015-0937-8.
    • Chédeville C., Roche O. (2014). Autofluidization of pyroclastic flows propagating on rough substrates as shown by laboratory experiments. Journal of Geophysical Research-Solid Earth 119, 1764-1776. doi:10.1002/2013JB010554.
    • Dennen R.L., Bursik M.I., Roche O. (2014). Dome collapse mechanisms and block-and-ash flow emplacement dynamics inferred from deposit and impact mark analysis, Mono Craters, CA. Journal of Volcanology and Geothermal Research 276, 1-9. doi:10.1016/j.jvolgeores.2014.02.016.
    • Farin M., Mangeney A., Roche O. (2014). Fundamental changes of granular flow dynamics, deposition and erosion processes at high slope angles: insights from laboratory experiments. Journal of Geophysical Research-Earth Surface 119, 504-532. doi:10.1002/2013JF002750.
    • Rowley P.J., Roche O., Druitt T., Cas R. (2014). Experimental study of dense pyroclastic density currents using sustained gas-fluidized granular flows: Bulletin of Volcanology, v. 855, p. 76. doi:10.1007/s00445-014-0855-1.
    • Roche O., Niño Y., Mangeney A., Brand B., Pollock N., Valentine G.A. (2013). Dynamic pore-pressure variations induce substrate erosion by pyroclastic fl ows: Geology, v. 41, p. 1107-1110. doi:10.1130/G34668.1.
    • Roche O., Phillips J.C., Kelfoun K. (2013). Pyroclastic density currents. p.3215, Modeling Volcanic Processes, Eds. S.A. Faggents, T.K.P. Gregg, R.C.M. Lopes, Cambridge University Press (ed.).
    • Jessop D., Kelfoun K., Labazuy P., Mangeney A., Roche O., Tillier J.L., Trouillet M., Thibault G. (2012). LiDAR derived morphology of the 1993 Lascar pyroclastic flow deposits, and implication for flow dynamics and rheology. Journal of Volcanology and Geothermal Research 245-246, 81-97. doi:10.1016/j.jvolgeores.2012.06.030.
    • Meruane C., Tamburrino A., Roche O. (2012). Dynamics of dense granular flows of small-and-large-grains mixtures in an ambient fluid. Physical Review E 86, 026311. doi:10.1103/PhysRevE.86.026311.
    • Montserrat S., Tamburrino A., Roche O., Niño Y. (2012). Pore fluid pressure diffusion in defluidizing granular columns. Journal of Geophysical Research 117, F02034. doi:10.1029/2011JF002164.
    • Roche O. (2012). Depositional processes and gas pore pressure in pyroclastic flows: an experimental perspective. Bulletin of Volcanology 74, 1807-1820. doi:10.1007/s00445-012-0639-4.
    • Roche O., Attali M., Mangeney A., Lucas A. (2011). On the run-out distance of geophysical gravitational flows: Insight from fluidized granular collapse experiments: Earth and Planetary Science Letters, v. 311, p. 375-385. doi:10.1016/j.epsl.2011.09.023.
    • Girolami L., Roche O., Druitt T., Corpetti T. (2010). Particle velocity fields and depositional processes in laboratory ash flows, with implications for the sedimentation of dense pyroclastic flows. Bulletin of Volcanology, 72, 747-759. doi:10.1007/s00445-010-0356-9.
    • Mangeney A., Roche O., Hungr O., Mangold N., Faccanoni G., Lucas A. (2010). Erosion and mobility in granular collapse over sloping beds. Journal of Geophysical Research – Earth Surface, 115, F03040. doi:10.1029/2009JF001462.
    • Meruane C., Tamburrino A., Roche O. (2010). On the role of the ambient fluid on gravitational granular flow dynamics. Journal of Fluid Mechanics 648, 381-404. doi:10.1017/S0022112009993181.
    • Roche O., Montserrat S., Niño Y., Tamburrino A. (2010). Pore fluid pressure and internal kinematics of gravitational laboratory air-particle flows : insights into the emplacement dynamics of pyroclastic flows. Journal of Geophysical Research – Solid Earth, 115, B09206. doi:10.1029/2009JB007133.

    Rang B et C :

    • Jessop D., Dufek J., Jellinek A.M., Roche O., Gilchrist J. (2017). Particle-plume coupling and vent-shape effects on volcanic plume stability. IAVCEI 2017, Portland (OR), USA.
    • Le Pennec J.L., Robin C., Roche O., Samaniego P., Bani P., Eychenne J., Bernard J. (2017). Processus et aléas et risques volcaniques dans les pays de développement : apports des recherches partenariales de l'IRD au LMV. Revue d'Auvergne vol.262-263, p.225-266.
    • Brand B., Pollock N., Gase A., Sarocchi D., Roche O. (2016). The erosive nature of pyroclastic density currents – A summary of findings from the 18 May 1980 Mt St Helens (USA) deposits with implications for future work. Cities on volcanoes 9, Puerto Varas, Chile.
    • Samaniego P., Mariño J., Valderrama P., Roche O., Van Wyk De Vries B., Manrique N., Liorzou C. (2016). The historical (218 ± 14 aBP) explosive eruption of Tutupaca volcano (Southern Peru). Cities on Volcanoes 9 conference, Puerto Varas, Chile, 20-25 November 2016.
    • Vera C., Castruccio A., Tamburrino A., Roche O. (2016). The influence of varying erosion rate and front cooling on lava flows: insights from analogue experiments of plastic flows. Cities on volcanoes 9, Puerto Varas, Chile.
    • Chedeville C., Roche O. (2015). Role of slope angle and substrate roughness on pore pressure generation in ash rich pyroclastic flows: Experimental insights. 26th IUGG General Assembly, Prague. Abstract: IUGG-3633. oral.
    • Clavero J., Castruccio A., Droguett B., Segura A., Le Pennec J.L., Roche O., Samaniego P. (2015). Small volume pyroclastic density currents of the 22-23 April 2015 eruption on the NE flank of Calbuco volcano, Southern Andes. XIV Chilean Geological Congress - Congreso Geológico Chileno, La Serena, Chile, 4-8 October 2015.
    • Gueugneau V., Kelfoun K., Roche O. (2015). Validation of a numerical model of fluidised granular flow from laboratory experiments. 26th IUGG General Assembly, Prague. Abstract: VS06p-386. Poster.
    • Ionescu I., Mangeney A., Bouchut F., Roche O. (2015). Viscoplastic modelling of granular column collapse with pressure dependent rheology. abstract Number : 95. Conf 8GRACM.
    • Ionescu I., Mangeney A., Bouchut F., Roche O. (2015). Viscoplastic modelling of granular column collapse with pressure dependent rheology. 8th GRACM International congress on computational mechanics, Volos, Greece, 12-15 July.
    • Jessop D., Jellinek M., Roche O. (2015). The role of inertial particles and vent geometries in the rise and collapse of volcanic jets. 26th IUGG General Assembly, Prague, Czech Republic, June 2015.
    • Jessop D., Jellinek M., Roche O., Gilchrist J. (2015). The role of inertial particles and vent geometries in the rise and collapse of volcanic jets. IUGG, Prague, Juin 2016.
    • Jordan S., Gurioli L., Colombier M., Le Pennec J.L., Roche O. (2015). Integration of porosity, connectivity and permeability measurements to determine syn-eruptive degassing processes during a sub-plinian basaltic. vol.17, p.EGU2015-345, EGU General Assembly 2015, Vienna, Austria, 12 – 17 April 2015.
    • Jordan S., Le Pennec J.L., Gurioli L., Roche O. (2015). Insights into the sub-plinian eruption of a basaltic monogenetic volcano using different analytical methods. vol.17, p.EGU2015-345, EGU General Assembly 2015, Vienna, Austria, 12 – 17 April 2015.
    • Martin N., Roche O. (2015). Modelling of a viscoplastic granular column collapse and comparison with experiments. EGU2015-12658.
    • Roche O. (2015). Dimensional analysis, scaling, and similarity: An overview of the methods and their application to investigate volcanic processes. 26th IUGG General Assembly, Prague. Abstract: IUGG-4460.
    • Roche O., Buesch D., Valentine G. (2015). Flow mechanism and discharge rate of the parent Peach Spring Tuff pyroclastic density currents during the Silver Creek caldera eruption. 26th IUGG General Assembly, Prague. Abstract: IUGG-3032. Oral.
    • Rowley P., Roche O. (2015). Two-layer aerated granular flows and implications for pyroclastic density current structure. 26th IUGG General Assembly, Prague. Abstract: VS08p-582. Poster.
    • Samaniego P., Valderrama P., Mariño J., Van Wyk De Vries B., Roche O., Manrique N., Chedeville C., Liorzou C., Fidel L., Malnati J. (2015). First geological data of an unknown historical eruption (218 ± 14 aBP) at Tutupaca volcano (Southern Peru). IUGG, Prague.
    • Segura A., Castruccio A., Clavero J., Le Pennec J.L., Roche O., Samaniego P., Droguett B. (2015). Fallout deposits of the 22-23 April 2015 eruption of Calbuco volcano, Southern Andes. XIV Congreso Geológico Chileno, La Serena.
    • Segura A., Castruccio A., Clavero J., Le Pennec J.L., Roche O., Samaniego P., Droguett B., Romero J. (2015). Fallout deposits of the 22-23 April 2015 eruption of Calbuco volcano, Southern Andes. XIV Chilean Geological Congress - Congreso Geológico Chileno, La Serena, Chile, 4-8 October 2015.
    • Valderrama P., Roche O., Van Wyk De Vries B., Samaniego P., Bernard K. (2015). Complex emplacement of the 1802 AD volcanic debris avalanche at Tutupaca volcano, Southern Peru, as revealed by surface deposit structures. IUGG, Prague.
    • Chédeville C., Roche O. (2014). Pyroclastic flows autofluidized by air escape from interstices of rough substrates at various slope angles: experimental insights. EGU General Assembly, Vienna, Absract EGU2014-344. .
    • Clavero, J., Castruccio, A., Droguett, B., Segura, A., Le Pennec J.L., Roche O., Samaniego P. (2014). XIV Congreso Geológico Chileno. XIV Congreso Geológico Chileno, La Serena.
    • Farin M., Mangeney A., Roche O. (2014). Fundamental changes of granular flows dynamics, deposition and erosion processes at high slope angles: insights from laboratory experiments. EGU General Assembly, Vienna. Abstract EGU2014-83. .
    • Haddadi B., Jordan S., Sanchez L., Gurioli L., Harris A., Laporte D., Le Pennec J.L., Menand T., Roche O., Sigmarsson O. (2014). Eruptions exceptionnelles : le volcanisme basaltique explosif. Manifestation scientifique de restitution du CPER 2007-2014, Conseil régional d’Auvergne, 08-09 décembre 2014 (poster). .
    • Jessop D., Jellinek M., Roche O. (2014). Turning off entrainment: the role of particle size distributions and vent geometry in the collapse of volcanic jets. AGU Fall Meeting. .
    • Jordan S., Le Pennec J.L., Roche O., Gurioli L. (2014). Violent Strombolian to Subplinian Eruption of a Monogenetic Cone Complex, Chaîne Des Puys, France. AGU Fall Meeting. .
    • Mangeney A., Ionescu I., Bouchut F., Roche O. (2014). Quantitative Simulation of Granular Collapse Experiments with Visco-Plastic Models ». AGU Fall Meeting. .
    • Roche O., Laporte D., Vlastélic I. (2014). Recherches sur le volcanisme au Laboratoire Magmas et Volcans dans le cadre du CPER 2007-2014. Manifestation scientifique de restitution du CPER 2007-2014, Conseil régional d’Auvergne, 08-09 décembre 2014 (présentation orale). .
    • Roche O., Niño Y. (2014). Mechanisms of entrainment of a granular substrate by pyroclastic density currents: insights from laboratory experiments and models, and implications for flow dynamics. Proceedings of GeoMod2014 – Modelling in Geosciences: Programme and Extended Abstracts. doi:10.2312/GFZ.geomod.2014.2001.
    • Valderrama P., Samaniego P., Mariño J., Van Wyk De Vries B., Manrique N., Roche O., Fidel F. (2014). Dos colapsos sectoriales recientes del volcán Tutupaca: Implicaciones en la evaluación de la amenaza volcánica. XVII Congreso Peruano de Geología, Resumenes extendidos. Sociedad Geológica del Perú, Lima. .
    • Farin M., Mangeney A., Roche O. (2013). Flow deposit and erosion processes in granular collapse over sloping beds. in Abstract 1P1-3G-O18, IAVCEI General Assembly, Kagoshima. .
    • Roche O., Niño Y., Mangeney A., Brand B., Valentine G.A. (2013). Inverting pyroclastic flow deposits from the characteristics of substrate-derived clasts: an experimental investigation. in Abstract 1A1-3G-01, IAVCEI General Assembly, Kagoshima. (Invité). .
    • Rowley P., Roche O., Cas R., Druitt T. (2013). Experimental investigation of pyroclastic flows generated by continuous supply of materia. in Abstract 1P1-3G-O15, IAVCEI General Assembly, Kagoshima. .
    • Rowley P., Roche O., Druitt T., Cas R.A.F. (2013). Experimental investigation of pyroclastic flows generated by a continuous supply of material. in IAVCEI Scientific Assembly, Kagoshima, Japan. .
    • Farin M., Mangeney A., Roche O. (2012). Insight into erosion processes in granular flows over sloping beds. AGU fall meeting. Poster, Abstract V41B-2777. .
    • Farin M., Mangeney A., Roche O., Ionescu I.R., Hungr O. (2012). Landslide boost from entrainment of erodible material along the slope. Abs. n° EGU2012-3526. EGU, 22-27 April, Vienna. Affiche. .
    • Molle A., Ogburn S.E., Calder E.S., Roche O., Harris A. (2012). Dynamic observations of the 8 January 2010 pyroclastic flow from the Soufriere Hills Volcano, Montserrat ascertained by high-definition and FLIR video analysis, as well as geometric analysis of the DEM. AGU fall meeting. Communication orale, Abstract V52C.
    • Roche O., Chedeville C. (2012). Analog laboratory experiments on the influence of substrate roughness on the run out distance of pyroclastic flows. AGU fall meeting. Poster, Abstract V41B-2776. .
    • Roche O., Niño Y., Mangeney A., Brand B.D., Valentine G.A. (2012). Entrainment of granular substrate by pyroclastic flows: an experimental study and its implications for flow dynamics. Abstract V52C-07, AGU fall meeting, San Francisco. Communication invitée. .
    • Dennen R., Bursik M., Roche O. (2011). Three Stage Collapse of Panum Dome, Mono Craters: CA. Abs. n° 5214./ IUGG/, 3-7 July, Melbourne. Communication orale. .
    • Mangeney A., Roche O., Hungr O., Mangold N., Faccanoni G., Lucas A. (2011). Run Out Increase of Pyroclastic Flows Caused by Substrate Erosion: An Experimental Study and its Implications: Abs. n° 3538./ IUGG/, 3-7 July, Melbourne. Affiche. .
    • Roche O., Montserrat S., Niño Y., Tamburrino A. (2011). Pore fluid pressure and depositional processes of laboratory air-particle gravity currents: Implications for the emplacement of pyroclastic Flows: Abs. n°2700./ IUGG/, 3-7 July, Melbourne. Communication orale. .
    • Roche O., Montserrat S., Niño Y., Tamburrino A., Attali M. (2011). Pore fluid pressure, depositional processes, and scaling laws of flows generated from the release of gas-fluidised granular columns.: Earth Surface Sedimentary Flows, 11-13 April, University of Bristol. Communication orale. .

    Publications antérieures :

    Journal articles (Publications Références bibliographiques HAL)

    10. Roche O., S. Montserrat, Y. Niño, A. Tamburrino (2008). Experimental observations of water-like behavior of initially fluidized, unsteady dense granular flows and their relevance for the propagation of pyroclastic flows. Journal of Geophysical Research–Solid Earth, 113, B12203, doi: 10.1029/2008JB005664.

    9. Girolami L., T.H. Druitt, O. Roche, Z. Khrabrykh (2008). Propagation and hindered settling of laboratory ash flows. Journal of Geophysical Research – Solid Earth, 113, B02202, doi: 10.1029/2007JB005074.

    8. Roche O., M.A. Gilbertson, J.C. Phillips, R.S.J. Sparks (2006). The influence of particle size on the flow of initially fluidized powders. Powder Technology, 166: 167-174. doi: 10.1016/j.powtec.2006.05.010.

    7. Roche O., M.A. Gilbertson, J.C. Phillips, R.S.J. Sparks (2005). Inviscid behaviour of fines-rich pyroclastic flows inferred from experiments on gas-particles mixtures. Earth and Planetary Science Letters, 240: 401-414. doi:10.1016/j.epsl.2005.09.053

    6. Roche O., M.A. Gilbertson, J.C. Phillips, R.S.J. Sparks (2004). Experimental study of gas-fluidized granular flows with implications for pyroclastic flow emplacement. Journal of Geophysical Research – Solid Earth, 109: doi 10.1029/2003JB002916.

    5. Roche O., M.A. Gilbertson, J.C. Phillips, R.S.J. Sparks (2002). Experiments on deaerating granular flows and implications for pyroclastic flow mobility. Geophysical Research Letters, 29: doi 10.1029/2002GL014819.

    4. Roche O., T.H. Druitt, R.A.F. Cas (2001). Experimental aqueous fluidization of ignimbrite. Journal of Volcanology and Geothermal Research, 112: 267-280.

    3. Roche O., T.H. Druitt (2001). Onset of caldera collapse during ignimbrite eruptions. Earth and Planetary Science Letters, 191: 191-202.

    2. Roche O., B. van Wyk de Vries, T.H. Druitt (2001). Sub-surface structures and collapse mechanisms of summit pit-craters. Journal of Volcanology and Geothermal Research, 105: 1-18.

    1. Roche O., T.H. Druitt, O. Merle (2000). Experimental study of caldera formation. Journal of Geophysical Research – Solid Earth, 105: 395-416.

     

    Book Chapters

    2. Roche O., J.C. Phillips, K. Kelfoun (2013). Pyroclastic density currents. Modeling Volcanic Processes (Eds. S.A. Faggents, T.K.P. Gregg, R.C.M. Lopes), Cambridge University Press, pp. 203-229.

    1. Dufek J., T. Esposti-Ongaro, O. Roche (2015). Pyroclastic density currents: Processes and models. Encyclopedia of Volcanoes (Eds. H. Sigurdsson et al.), Elsevier, chap. 35.

     

    Conference proceedings

    6. Roche O., Y. Niño (2014). Mechanisms of entrainment of a granular substrate by pyroclastic density currents: insights from laboratory experiments and models, and implications for flow dynamics. In Proceedings of GeoMod2014 – Modelling in Geosciences, K. Elger, Ø.T. Haug, M.C. Ritter (Eds), Programme and Extended Abstracts 31 August – 5 September 2014, Potsdam, GFZ German Research Centre for Geosciences. 3 p, doi: http://doi.org/10.2312/GFZ.geomod.2014.001.

    5. Rodríguez I., S. Moune, F. Aguilera, E. Campos, O. Roche (2013). Insights on degassing processes of Lastarria volcano (North Chile) via melt inclusion investigations. Special Issue of the Bollettino di Geofisica Teorica ed Applicata, GeoSur 2013, 25-27 nov, Viña del Mar, Chile.

    4. Meruane C., A. Tamburrino, O. Roche (2008). Relación constitutiva para la fuerza de interactión partículas-fluido en un flujo gravitational de material granular. XXIII Congresso Latinoamerica de Hydraulica, Cartagenia, Colombia, sept. 2008. 11 p.

    3. Montserrat S., A. Tamburrino, Y. Niño, O. Roche (2007). Kinematics and pore pressure dynamics in aerated granular flows. Proc. 32 Int. Assoc. Hydraulic Res. Congress, Venice, Italy. 8 p.

    2. Roche O., S. Montserrat, Y. Niño, A. Tamburrino (2005). Propagation and final deposition of granular flow: dam-break experiments with water and gas-fluidized grains. Proc. River Coastal and Estuarine Morphodynamics, Urbana Champaign, USA. 7 p.

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