Alexandre Valance

Directeur de Recherche CNRS

A Valloire

Adresse courriel : Alexandre [dot] Valance [at] univ-rennes1 [dot] fr

Téléphone : +33 223235599

Numéro de bureau : Bât. 11A, bureau 131

Thématiques de recherche

  • Ecoulements granulaires, Ecoulements fluide-particules
  • Transport éolien du sable, transport fuviatile
  • Morphodynamique des dunes de sable
  • Morphogenèse, Dynamique non-linéaire et chaos

Projets en cours

  • ANR EOLE (2022-2026): "Transport éolien de particules cohésives: Du sable à la neige". Partenaires: IRSTEA Grenoble, LTeN Nantes
  • ANR SONO (2017-2021): "Marying coastal Safety objectives with natural development of sand dunes". Partenaires: EPOC, IPGP, ONF.
  • ANR SEGSED (2016-2020): "Segregation in sediment transport". Partenaires: IRSTEA Grenoble, LEGI.

 

Publications à venir

  • S. Kiki, N. Le Dantec, A. Valance (2022). Two-dimensional subaqueous dunes: scaling laws and saturation length (Preprint).
  • G. Minster , F. Floc’h, A. Valance, N. Le Dantec , A. Nicolle, B. Zerr, (2022). Saltation in extreme currents : An experimental study. (Preprint).
  • Y. Zhu, A. Valance and R. Delannay (2022). Boundary conditions for granular flows bounded by flat frictional surfaces. (Preprint)
  • J.B. Besnard, P. Dupont, A. El Moctar, F. Naaim, and A. Valance (2022). Aeolian erosion thresolds for cohesive sand. Soumis à JGR.
  • J.-L. Ralaiarisoa,, P. Dupont, A. Ould El. Moctar, F. Naaim, A. Valance (2022). Particle impact on a cohesive granular packing. Soumis à Phys Rev E.
  • M.Y. Louge, A. Valance, J. Xu, A. Ould El Moctar and P. Chasle (2022). Water vapor transport across an arid sand surface non-linear thermal coupling, wind-driven pore advection, subsurface waves, and exchange with the atmospheric boundary layer. En cours de révision à Journal of Geophysical Research: Atmospheres. 
  • A. Valance and D. Berzi (2022). Particle saltation in viscous shearing flows. En cours de révision à JFM.
  • P. Richard, A. Valance, R. Delannay, P. Boltenhagen (2022). Granular surface flows confined between flat,frictional walls. Part I: Kinematics. A paraitre dans JFM.
  • A. Neveu, R. Delannay, A. Valance, J. Jenkins and M. Larcher. (2022). Particle segregation in inclined high-speed granular flows. JFM, 935, A41,https://doi.org/10.101017/jfm.2022.51

Publications Récentes

  • O. Roche, S. van den Wildenberg, A. Valance, R. Delannay, A. Mangeney, L. Corna, T. Latchimy (2021). Experimental assessment of the effective friction at the base of granular chute flows on smooth incline. Physical Review E,103, 042905. https://doi.org/10.1103/PhysRevE.103.042905
  • Y. Zhu, R. Delannay, A. Valance (2020). High-speed confined granular flows donw smooth inclines: scaling and wall friction law (2020). Granular Matter 22:82. https://doi.org/10.1007/s10035-020-01053-7
  • P. Richard, R. Artoni, A. Valance, R. Delannay (2020). Influence of lateral confinement on granular flows: comparison between shear‐driven and gravity‐driven flows. Granular Matter 22:81. https://doi.org/10.1007/s10035-020-01057-3
  • J.-L. Ralaiarisoa, J.-B. Besnard, B. Furieri, P. Dupont, A. Ould El. Moctar, F. Naaim, A. Valance (2020). Transition from saltation to collisional regime in wind-blown sand. Physical Review Letters 124, 198501.https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.124.198501
  • Castelle, B.; Laporte-Fauret, Q.; Marieu, V.; Michalet, R.; Rosebery, D.; Bujan, S.; Lubac, B.; Bernard, J.-B.; Valance, A.; Dupont, P.; Ould El Moctar, A.; Narteau, C. Nature-Based Solution along High-Energy Eroding Sandy Coasts: Preliminary Tests on the Reinstatement of Natural Dynamics in Reprofiled Coastal Dunes. Water 2019, 11, 2518. https://doi.org/10.3390/w11122518
  • M.-C. Ferreira, B. Furieri, B., J.M Santos, J.-L. Harion, Ould El Moctar, A, Valance, P. Dupont et al. (2019). An experimental and numerical study of the aeolian erosion of isolated and successive piles. Environ Fluid Mech. https://doi.org/10.1007/s10652-019-09702-z
  • Bruno Furieri, Maria Clara Caliman, Alexandre Valance et al. (2019). A simple model to estimate emission of wind-blown particles from a granular bed in comparison to wind tunnel experiments. Geomorphology. https://doi.org/10.1016/j.geomorph.2019.03.004
  • Selmani, H., Valance, A., Ould El Moctar, A., Dupont, P., & Zegadi, R. (2018). Aeolian sand transport in out-of-equilibrium regimes. Geophysical Research Letters, 45. https://doi.org/10.1002/2017GL076937
  • J. T. Jenkins & A. Valance (2018). Two-phase continuum theory of wind blown sand. Phys. Rev. Fluid. https://doi.org/10.1103/PhysRevFluids.3.034305
  • S. Belkacem, F, Ould Kaddour and A. Valance (2018). Spreading of a granular droplet under horizontal vibrations. Phys. Rev. E. https://link.aps.org/doi/10.1103/PhysRevE.97.062903

Outils expérimentaux et numériques

Vélocimétrie par suivi de particules dans un écoulement turbulent d'air chargé de grains de sable

 

Simulations numériques discrètes d'un écoulement granulaire granulaire confiné entre 2 parois