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Université de Fribourg

Carbonate mounds of the Moroccan Mediterranean margin: Facies and environmental controls

Terhzaz, Loubna ; Hamoumi, Naima ; Spezzaferri, Silvia ; El Lotfi, Mostapha ; Henriet, Jean-Pierre

In: Comptes Rendus Geoscience, 2018, vol. 350, no. 5, p. 212–221

Sedimentological and geochemical studies of boxcores from the Brittlestar Ridge I and Cabliers carbonate mounds, along the Moroccan Mediterranean margin, show that sediments are composed of cold water scleratian corals and micritic mud, muddy micrite or muddy allochem limestone matrix, outlining seven different facies that can be attributed to “cluster reefs”. The mixed...

Université de Neuchâtel

An optical laser device for mapping 3D geometry of underwater karst structures : first tests in the Ox Bel’Ha system, Yucatan, Mexico = Un dispositivo láser óptico para la cartografía 3D de la geometría de estructuras kársticas submarinas: primeros resultados en el sistema de Ox Bel’Ha, Yucatán, México

Schiller, A ; Renard, Philippe

In: Boletin Geológico y Minero, 2016, vol. 127, no. 1, p. 99-110

In the course of extended hydrological studies in the coastal Karst plain of Yucatan, near the town of Tulum amongst others, a novel laser scanning device was developed and applied for the acquisition of the 3d-geometry of ground water conduits. The method is derived from similar industrial systems and for the first time adapted to the specific measurement conditions in underwater cave systems....

Université de Neuchâtel

Beyond Production and Standards: Toward a Status Market Approach to Territorial Innovation and Knowledge Policy

Macneill Stewart ; Jeannerat, Hugues

In: Regional Studies, 2016, vol. 50, no. 2, p. 245-259

Current theoretical and policy models of innovation are usually production based and give prominence to producer–supplier relations. Drawing on a socio-economic approach to markets, the paper reconsiders these established models in order to broaden the understanding of innovation and territorial knowledge dynamics. The premium segment sports cars innovated in the UK's West Midlands is examined...

Université de Neuchâtel

3D stochastic modeling of karst aquifers using a pseudo-genetic methodology

Borghi, Andrea ; Renard, Philippe (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2013.

The focus of this thesis is the development of a methodology to model karst aquifers. First the geometry of the karst conduits is simulated. Their geometry is controlled by the geology at large scale (geological model) and by the fracturation at smaller scale (stochastic model of fractures). Secondly, these geometrical models (3D geological formation together with conduits) are used as base...

Université de Fribourg

La confluencia genérica en el cuento Otas de Roma del manuscrito escurialense H-I-13 : en búsqueda de un género literario

Pereira, Ruben

In: Tirant, 2011, no. 14, p. 156-182

This essay, based on a short story from the beginning of the 14th century, investigates the convergence of genres in El cuento muy fermoso del enperador Otas de Roma that derives from the French chanson Florence de Rome from the beginning of the 13th century. The text found in the Escorial manuscript h-I-13 as well as the other works from this anthology have some similarities with the...

Université de Neuchâtel

A new quantitative interpretation of the long-tail and plateau-like breakthrough curves from tracer tests in the artesian karst aquifer of Stuttgart, Germany

Goldscheider, Nicola

In: Hydrogeology Journal, 2008, vol. 16, no. 7, p. 1311-1317

In 1998 and 1999, two multi-tracer experiments were conducted in the artesian karst aquifer of the mineral springs of Stuttgart, Germany. The breakthrough curves (BTCs) monitored at the springs showed very long tails or developed plateau-like concentration levels for more than 200 days. Initially, this observation was qualitatively explained by exchange between cavities with stagnant water and...

Université de Neuchâtel

Implications of the spatial variability of infiltration-water chemistry for the investigation of a karst aquifer: a field study at Milandre test site, Swiss Jura

Perrin, J. ; Jeannin, Pierre-Yves ; Zwahlen, François

In: Hydrogeology Journal, 2003, vol. 11, no. 6, p. 673-686

The Milandre test site is an ideal karstic aquifer for studying the spatial heterogeneity of groundwater chemistry. Numerous observation points can be sampled: the spring, the underground river and its tributaries, and boreholes at different depths. The main causes of the spatial variability of the chemical parameters are: nature and localisation of the input, the structure of the infiltration...

Université de Neuchâtel

Introducing wwhypda : a world-wide collaborative hydrogeological parameters database

Comunian, Alessandro ; Renard, Philippe

In: Hydrogeology Journal, 2009, vol. 17, no. 2, p. 481-489

Since the seminal publication of Henry Darcy’s work in the 1880s, a very large number of rock property values (such as hydraulic conductivity, permeability, compressibility, porosity, etc.) has been measured and published. These data are, however, dispersed and difficult to access. To overcome this problem and to facilitate site characterization (especially stochastic), a worldwide...

Université de Neuchâtel

A Fast Algorithm for the Estimation of the Equivalent Hydraulic Conductivity of Heterogeneous Media

Renard, Philippe ; Le Loc’h, Gaëlle ; Ledoux, Emmanuel ; de Marsily, Ghislain ; Mackay, Rae

In: Water Resources Research, 2000, vol. 36, no. 12, p. 3567–3580

Fast upscaling of hydraulic conductivity is a recurrent problem in modeling flow through heterogeneous porous media. We propose a new renormalization technique. It is based on the iterative application of the Cardwell and Parsons [1945] bounds on elementary groups of cells. The combination of the bounds with a heuristic formula allows anisotropy to be taken into account. The new technique is...