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Straubhaar, Julien

My main research topic is the geostatistics. I'm developing new Multiple-Point Statistics (MPS) algorithms. MPS allows to generate complex heterogeneous fields in a stochastic framework by integrating a conceptual model (training image). This is a crucial issue in geostatistical simulations because the spatial features of geological structures have a deep impact on the dynamic processes (flow / transport).


Impala and DeeSse are two Multiple-Point Statistics Softwares developed in the Stochastic Hydrogeology Group.

  • Impala : written in C, serial version and parallel versions: OpenMP (for shared memory machines) / MPI (for distributed memory machines (HPC cluster))
  • DeeSse : written in C, serial version and parallel versions: OpenMP (for shared memory machines) / CUDA (for shared memory machines equipped with GPUs)

Education

  • 2007 - Doctorat ès Sciences (Ph.D.), Université de Neuchâtel (mathématiques appliquées)
  • 2002 - Diplôme de mathématicien (MSc.), Université de Neuchâtel

Positions held

  • 2009 - now - Maître-assistant (Senior Lecturer) au Centre d'Hydrogéologie et de Géothermie (CHYN), Université de Neuchâtel, Switzerland
  • 2007 - 2009 - Postdoc au Centre d'Hydrogéologie et de Géothermie (CHYN), Université de Neuchâtel, Switzerland
  • 2002 - 2007 - Assistant-doctorant (PhD student) à l'institut de mathématiques, Université de Neuchâtel, Switzerland
  • 2001 - 2002 - Assistant (non dipômé) à l'institut de mathématiques, Université de Neuchâtel, Switzerland

Publications

  • A. Comunian, P. Renard, J. Straubhaar (2012) 3D multiple-point statistics simulation using 2D training images. Comput Geosci 40:49-65, DOI: 10.1016/j.cageo.2011.07.009
  • J. Straubhaar, P. Renard, G. Mariethoz, R. Froidevaux, O. Besson (2011) An Improved Parallel Multiple-Point Algorithm Using a List Approach. Math Geosci 43(3):305-328, DOI: 10.1007/s11004-011-9328-7
  • P. Renard, J. Straubhaar, J. Caers, G. Mariethoz (2011) Conditioning Facies Simulations with Connectivity Data. Math Geosci 43(8):879-903, DOI: 10.1007/s11004-011-9363-4
  • G. Mariethoz, P. Renard, J. Straubhaar (2011) Extrapolating the Fractal Characteristics of an Image Using Scale-Invariant Multiple-Point Statistics. Math Geosci 43(7):783-797, DOI: 10.1007/s11004-011-9362-5
  • A. Comunian, P. Renard, J. Straubhaar, P. Bayer (2011) Three-dimensional high resolution fluvio-glacial aquifer analog - Part 2: Geostatistical modeling. J Hydrol 405(1-2):10-23, DOI: 10.1016/j.jhydrol.2011.03.037
  • G. Mariethoz, P. Renard, J. Straubhaar (2010) The Direct Sampling method to perform multiple-point geostatistical simulations. Water Resour Res 46:W11536, DOI: 10.1029/2008WR007621
  • J. Straubhaar (2008) Parallel preconditioners for the conjugate gradient algorithm using Gram-Schmidt and least squares methods. Parallel Comput 34(10):551-569, DOI: 10.1016/j.parco.2008.06.001
  • J. Straubhaar (2007) Preconditioners for the conjugate gradient algorithm using Gram-Schmidt and least squares methods. Int J Comput Math 84(1):89-108, DOI: 10.1080/00207160601173621
  • J. Straubhaar (2007) Préconditionnement de systèmes linéaires symétriques définis positifs. Application à la simulation numérique d'écoulements océaniques tridimensionnels. Ph.D. Thesis, Université de Neuchâtel, link

 

Contact

Julien Straubhaar

 

Office: E324

Tél. : +41 (0) 32 718 28 11

 

 

Centre d'hydrogéologie et de géothermie (CHYN)
Emile-Argand 11
CH-2000 Neuchâtel

 

Julien Straubhaar