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Université de Neuchâtel

A geostatistical approach to the simulation of stacked channels

Rongier, G ; Collon, P ; Renard, Philippe

In: Marine and Petroleum Geology, 2017, vol. 82, p. 318-335

Turbiditic channels evolve continuously in relation to erosion-deposition events. They are often gathered into complexes and display various stacking patterns. These patterns have a direct impact on the connectivity of sand-rich deposits. Being able to reproduce them in stochastic simulations is thus of significant importance. We propose a geometrical and descriptive approach to stochastically...

Université de Neuchâtel

Stochastic simulation of channelized sedimentary bodies using a constrained L-system

Rongier, G ; Collon, P ; Renard, Philippe

In: Computers & Geosciences, 2017, vol. 105, p. 158-168

Simulating realistic sedimentary bodies while conditioning all the available data is a major topic of research. We present a new method to simulate the channel morphologies resulting from the deposition processes. It relies on a formal grammar system, the Lindenmayer system, or L-system. The L-system puts together channel segments based on user-defined rules and parameters. The succession of...

Université de Neuchâtel

Statistical metrics for the characterization of karst network geometry and topology

Collon, P ; Bernasconi, D ; Vuilleumier, C ; Renard, Philippe

In: Geomorphology, 2017, vol. 283, p. 122-142

Statistical metrics can be used to analyse the morphology of natural or simulated karst systems; they allow describing, comparing, and quantifying their geometry and topology. In this paper, we present and discuss a set of such metrics. We study their properties and their usefulness based on a set of more than 30 karstic networks mapped by speleologists. The data set includes some of the largest...

Université de Neuchâtel

Can one identify karst conduit networks geometry and properties from hydraulic and tracer test data?

Borghi, Andrea ; Renard, Philippe ; Cornaton, Fabien

In: Advances in Water Resources, 2016, vol. 90, p. 99-115

Karst aquifers are characterized by extreme heterogeneity due to the presence of karst conduits embedded in a fractured matrix having a much lower hydraulic conductivity. The resulting contrast in the physical properties of the system implies that the system reacts very rapidly to some changes in the boundary conditions and that numerical models are extremely sensitive to small modifications in...

Université de Neuchâtel

Comparing connected structures in ensemble of random fields

Rongier, G ; Collon, P ; Renard, Philippe ; Straubhaar, J ; Sausse, J

In: Advances in Water Resources, 2016, vol. 96, p. 145-169

Very different connectivity patterns may arise from using different simulation methods or sets of pa-rameters, and therefore different flow properties. This paper proposes a systematic method to compare ensemble of categorical simulations from a static connectivity point of view. The differences of static con-nectivity cannot always be distinguished using two point statistics. In addition,...

Université de Neuchâtel

Impact of a stochastic sequential initiation of fractures on the spatial correlations and connectivity of discrete fracture networks

Bonneau, F ; Caumon, G ; Renard, Philippe

In: Journal of Geophysical Research: Solid Earth, 2016, vol. 121, no. 8, p. 5641-5658

Stochastic discrete fracture networks (DFNs) are classically simulated using stochastic point processes which neglect mechanical interactions between fractures and yield a low spatial correlation in a network. We propose a sequential parent-daughter Poisson point process that organizes fracture objects according to mechanical interactions while honoring statistical characterization data. The...

Consortium of Swiss Academic Libraries

Genome-wide meta-analysis of common variant differences between men and women

Boraska, Vesna ; Jerončić, Ana ; Colonna, Vincenza ; Southam, Lorraine ; Nyholt, Dale R. ; William Rayner, Nigel ; Perry, John R.B. ; Toniolo, Daniela ; Albrecht, Eva ; Ang, Wei ; Bandinelli, Stefania ; Barbalic, Maja ; Barroso, Inês ; Beckmann, Jacques S. ; Biffar, Reiner ; Boomsma, Dorret ; Campbell, Harry ; Corre, Tanguy ; Erdmann, Jeanette ; Esko, Tõnu ; Fischer, Krista ; Franceschini, Nora ; Frayling, Timothy M. ; Girotto, Giorgia ; Gonzalez, Juan R. ; Harris, Tamara B. ; Heath, Andrew C. ; Heid, Iris M. ; Hoffmann, Wolfgang ; Hofman, Albert ; Horikoshi, Momoko ; Hua Zhao, Jing ; Jackson, Anne U. ; Hottenga, Jouke-Jan ; Jula, Antti ; Kähönen, Mika ; Khaw, Kay-Tee ; Kiemeney, Lambertus A. ; Klopp, Norman ; Kutalik, Zoltán ; Lagou, Vasiliki ; Launer, Lenore J. ; Lehtimäki, Terho ; Lemire, Mathieu ; Lokki, Marja-Liisa ; Loley, Christina ; Luan, Jian'an ; Mangino, Massimo ; Mateo Leach, Irene ; Medland, Sarah E. ; Mihailov, Evelin ; Montgomery, Grant W. ; Navis, Gerjan ; Newnham, John ; Nieminen, Markku S. ; Palotie, Aarno ; Panoutsopoulou, Kalliope ; Peters, Annette ; Pirastu, Nicola ; Polašek, Ozren ; Rehnström, Karola ; Ripatti, Samuli ; Ritchie, Graham R.S. ; Rivadeneira, Fernando ; Robino, Antonietta ; Samani, Nilesh J. ; Shin, So-Youn ; Sinisalo, Juha ; Smit, Johannes H. ; Soranzo, Nicole ; Stolk, Lisette ; Swinkels, Dorine W. ; Tanaka, Toshiko ; Teumer, Alexander ; Tönjes, Anke ; Traglia, Michela ; Tuomilehto, Jaakko ; Valsesia, Armand ; van Gilst, Wiek H. ; van Meurs, Joyce B.J. ; Smith, Albert Vernon ; Viikari, Jorma ; Vink, Jacqueline M. ; Waeber, Gerard ; Warrington, Nicole M. ; Widen, Elisabeth ; Willemsen, Gonneke ; Wright, Alan F. ; Zanke, Brent W. ; Zgaga, Lina ; Boehnke, Michael ; d'Adamo, Adamo Pio ; de Geus, Eco ; Demerath, Ellen W. ; den Heijer, Martin ; Eriksson, Johan G. ; Ferrucci, Luigi ; Gieger, Christian ; Gudnason, Vilmundur ; Hayward, Caroline ; Hengstenberg, Christian ; Hudson, Thomas J. ; Järvelin, Marjo-Riitta ; Kogevinas, Manolis ; Loos, Ruth J.F. ; Martin, Nicholas G. ; Metspalu, Andres ; Pennell, Craig E. ; Penninx, Brenda W. ; Perola, Markus ; Raitakari, Olli ; Salomaa, Veikko ; Schreiber, Stefan ; Schunkert, Heribert ; Spector, Tim D. ; Stumvoll, Michael ; Uitterlinden, André G. ; Ulivi, Sheila ; van der Harst, Pim ; Vollenweider, Peter ; Völzke, Henry ; Wareham, Nicholas J. ; Wichmann, H.-Erich ; Wilson, James F. ; Rudan, Igor ; Xue, Yali ; Zeggini, Eleftheria

In: Human Molecular Genetics, 2012, vol. 21, no. 21, p. 4805-4815

Université de Neuchâtel

Connectivity of channelized sedimentary bodies : analysis and simulation strategies in subsurface modeling = Connectivité de corps sédimentaires chenalisés : stratégies d'analyse et de simulation en modélisation de subsurface

Rongier, Guillaume ; Renard, Philippe (Dir.) ; Sausse, Judith (Dir.) ; Collon, Pauline (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2016.

Les chenaux sont des structures sédimentaires clefs dans le transport et le dépôt de sédiments depuis les continents jusqu'aux planchers océaniques. Leurs dépôts perméables permettent la circulation et le stockage de fluides. Comme illustré avec les systèmes turbiditiques, le remplissage de ces chenaux est très hétérogène. Son impact sur la connectivité des dépôts perméables est...