Christophe Ancey

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Christophe Ancey
Known forSediment transport, Granular flow
Scientific career
FieldsFluid dynamics
InstitutionsÉcole polytechnique fédérale de Lausanne
Doctoral advisorPierre Evesque; Philippe Coussot

Christophe Ancey is currently an associate professor at École Polytechnique Fédérale de Lausanne (EPFL) in Switzerland.

He is the director of Environmental Hydraulics Laboratory (LHE), focusing on the research on sediment transport and granular flows.

Education and Career[

Christophe Ancey receives his engineering degree from Institut National Polytechnique de Grenoble and a doctoral degree from Ecole Centrale de Paris. He conducted research on the rheology of granular flows under the supervision of Pierre Evesque and Philippe Coussot from 1994 to 1997.[1] He joined École Polytechnique Fédérale de Lausanne (EPFL) as an assistant professor in 2003, and was promoted to an associated professor in fluid mechanics in 2009.

Christophe Ancey services as an associate editor of Water Resources Research[2] and Journal of Geophysical Research: Earth Surface.[3]

Scientific Research

Christophe Ancey has published more than 80 scientific papers. He is active in investigating the problems of sediment transport and granular flows mainly through experiments and theoretical analysis.

- sediment transport: Movement of sediments is essential to the erosion or deposition along the riverbed. Christophe Ancey proposed a theoretical model for sediment transport based on population dynamics by treating death as deposition, birth as entrainment, and emigration as motion.[4] This model has been tested against experimental data and modified to match field observations.[5][6] Intermittent process of sediment transport, interplays between bedload transport fluctuations and bedforms, and methods for estimating mean bedload transport rates are within the research scope.[7][8]

- particle segregation: The separation of particles with different physical properties under external force is called particle segregation. This phenomenon is quite common in industries (mining, pharmacy, agriculture) and essential to product quality. The nonlinear advection-diffusion equation[9] is utilized as a theoretical tool to analyze particle segregation.[10] In experiments of particle segregation, the refractive index matching technique is developed for obtaining a uniform refractive index domain, therefore inside structures of particle segregation can be visualized by using laser and fluorescent dye.[11]

- rheology of granular flow: The behavior of granular flow is unique because granular flows deform with an external force, which is also known as plasticity. Physical properties of granular flow such as yield stress,[12] viscosity,[13] the relationship between strain stress <math>\gamma</math> and shear stress <math>\tau</math> are within the investigation scope of Ancey's group. It is shown that depth-averaged (Saint-Venant) equation doesn't perform well in the dam-break problem owing to the complicated dependence of bottom shear stress on flow velocity.[14]

Teaching and Supervision

Christophe Ancey teaches 4 courses at EPFL, which are Fluid mechanics (bachelor level), Flood and dam break waves (master level), Hydrological risks and structures (master level), and Similarity and Transport Phenomena in Fluid (doctor level).[15]

More than 20 doctor students have been supervised by Christophe Ancey.

Business

In 1997, Christophe Ancey set up a consulting company named Toraval with Claude Charlier for engineering contracting in torrent protection and avalanches. Two books[16][17] published by Christophe Ancey serve as the guide of risk management on avalanches.

Environmental Hydraulics Laboratory (LHE)

Environmental Hydraulics Laboratory (LHE) dates back to the Hydraulic Testing Laboratory established by Alfred Stucky in 1928 in Lausanne, Switzerland, and becomes a hydraulics laboratory at EPFL in 1968. The laboratory is split into two parts in 1982, the one known as Hydraulic Constructions Laboratory (LCH) mainly focuses on water constructions projects, and the other one is Environmental Hydraulics Laboratory (LHE) currently led by Christophe Ancey. LHE mainly focuses on environmental hydraulics problems with an emphasis on the geophysical flows in the Alps.

References

  1. ↑ Ancey, Christophe (1997-01-01). Rhéologie des écoulements granulaires en cisaillement simple : Application aux laves torrentielles granulaires (These de doctorat thesis). Châtenay-Malabry, Ecole centrale de Paris.
  2. ↑ "Associate Editors - Water Resources Research".
  3. ↑ "Associate Editors - Journal of Geophysical Research: Earth Surface".
  4. ↑ Christophe, Ancey; Tobias, Böhm; Magali, Jodeau; Philippe, Frey (2006). "Statistical description of sediment transport experiments". Physical Review E. 74 (1): 011302. doi:10.1103/PhysRevE.74.011302. PMID 16907084.
  5. ↑ Heyman, Joris; Patricio, Bohorquez; Christophe, Ancey (2016). "Entrainment, motion, and deposition of coarse particles transported by water over a sloping mobile bed". Journal of Geophysical Research: Earth Surface. 121 (10): 1931–1952. doi:10.1002/2015JF003672.
  6. ↑ Ancey, C.; Davison, A. C.; Böhm, T.; Jodeau, M.; Frey, P. (2008-01-08). "Entrainment and motion of coarse particles in a shallow water stream down a steep slope". Journal of Fluid Mechanics. 595: 83–114. doi:10.1017/S0022112007008774. ISSN 1469-7645.
  7. ↑ Ancey, Christophe; Pascal, Ivan (2020-07-17). "Estimating Mean Bedload Transport Rates and Their Uncertainty". Journal of Geophysical Research: Earth Surface. 125 (7). doi:10.1029/2020JF005534. ISSN 2169-9003.
  8. ↑ Ancey, Christophe; Böhm, Tobias; Jodeau, Magali; Frey, Philippe (2006-07-18). "Statistical description of sediment transport experiments". Physical Review E. 74 (1): 011302. doi:10.1103/physreve.74.011302. ISSN 1539-3755. PMID 16907084.
  9. ↑ Gray, Nico; Thornton, Anthony (2005). "A theory for particle size segregation in shallow granular free-surface flows". Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences. 461 (2057): 1447–1473. doi:10.1098/rspa.2004.1420.
  10. ↑ Trewhela, T.; Ancey, C.; Gray, J. M. N. T. (2021-06-20). "An experimental scaling law for particle-size segregation in dense granular flows". Journal of Fluid Mechanics. 916: A55. doi:10.1017/jfm.2021.227. ISSN 0022-1120.
  11. ↑ Wiederseiner, Sébastien; Andreini, Nicolas; Epely-Chauvin, Gaël; Ancey, Christophe (2011-05-01). "Refractive-index and density matching in concentrated particle suspensions: a review". Experiments in Fluids. 50 (5): 1183–1206. doi:10.1007/s00348-010-0996-8. ISSN 1432-1114.
  12. ↑ Ancey, Christophe; Jorrot, Hélène (2001). "Yield stress for particle suspensions within a clay dispersion". Journal of Rheology. 45 (2): 297–319. doi:10.1122/1.1343879.
  13. ↑ Ancey, Christophe; Andreini, Nicolas; Epely-Chauvin, Gaël (2012). "Viscoplastic dambreak waves: Review of simple computational approaches and comparison with experiments". Advances in Water Resources. 48: 79–81. doi:10.1016/j.advwatres.2012.03.015.
  14. ↑ Ancey, Christophe; Andreini, Nicolas; Epely-Chauvin, Gaël (2012). "Viscoplastic dambreak waves: Review of simple computational approaches and comparison with experiments". Advances in Water Resources. 48: 79–91. doi:10.1016/j.advwatres.2012.03.015.
  15. ↑ "Christophe Ancey course - EPFL".
  16. ↑ Ancey, Christophe (1997). Guide Neige et Avalanches (in French) (1st ed.). Quae. ISBN 9782857447979.{{cite book}}: CS1 maint: unrecognized language (link)
  17. ↑ Ancey, Christophe (2006). Dynamique des avalanches (in French). PPUR presses polytechniques. ISBN 9782880746483.{{cite book}}: CS1 maint: unrecognized language (link)

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