Valorisation

SWIP: An integrated workflow for surface-wave dispersion inversion and profiling

The simultaneous estimation of 2D pressure (P-) and S-wave velocities (VP and VS, respectively) is a promising approach for imaging subsurface mechanical properties. It can be performed with a single acquisition setup by combining P-wave refraction and surface-wave (SW) analysis. Although SW methods are commonly applied for the 1D estimation of VS, 2D profiling requires the implementation of specific processing […]

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Installation d’un gravimètre supraconducteur sur le site du Strengbach (OHGE)

03 juillet 2017 Un gravimètre supraconducteur de nouvelle génération a été installé par l’équipe de gravimétrie de l’EOST/IPG Strasbourg dans un bâtiment de l’antenne TDF sur la partie sommitale du bassin versant du Strengbach dans les Vosges (Observatoire HydroGéochimique de l’Environnement, OHGE). Cet instrument est l’un des trois gravimètres supraconducteurs acquis dans le cadre du projet d’Excellence CRITEX (Etude de […]

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Neutrally buoyant tracers in hydrogeophysics: Field demonstration in fractured rock

Electrical and electromagnetic methods are extensively used to map electrically conductive tracers within hydrogeologic systems. Often, the tracers used consist of dissolved salt in water, leading to a denser mixture than the ambient formation water. Density effects are often ignored and rarely modeled but can dramatically affect transport behavior and introduce dynamics that are unrepresentative of the response obtained with […]

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Passive temperature tomography experiments to characterize transmissivity and connectivity of preferential flow paths in fractured media

The detection of preferential flow paths and the characterization of their hydraulic properties are major challenges in fractured rock hydrology. In this study, we propose to use temperature as a passive tracer to characterize fracture connectivity and hydraulic properties. In particular, we propose a new temperature tomography field method in which borehole temperature profiles are measured under different pumping conditions […]

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Le bungalow qui fluidifie les recherches

Installé depuis le début du mois à Aubure, le bungalow exploité par l’Observatoire hydro-géochimique de l’environnement (OHGE) et raccordé au Strengbach analyse en temps réel les composés physico-chimiques du ruisseau. un concentré de technologie qui permettra aux chercheurs de mieux comprendre la circulation de l’eau sur ce site au rayonnement scientifique international. © L’Alsace 2014 – ISSN 2102-6882 (Luc Sorgius) […]

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Glacial recharge, salinisation and anthropogenic contamination in the coastal aquifers of Recife (Brazil)

Implying large residence times and complex water origins deep coastal aquifers are of particular interest as they are remarkable markers of climate, water use and land use changes. Over the last decades, the Metropolitan Region of Recife (Brazil) went through extensive environmental changes increasing the pressure on water resources and giving rise to numerous environmental consequences on the coastal groundwater […]

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Newsletter 4 : Mars 2017

Editorial Bonjour, Bienvenue sur la newsletter 2016 de CRITEX. La newsletter CRITEX grossit d’années en années, signe du dynamisme du projet ! Vous trouverez dans ces quelques pages l’actualité 2016 du projet mais aussi celle des sciences de la Zone Critique. A ne pas manquer non plus, des interviews de Jean Francois Soussana de l’INRA et d’Alexandra Arènes, une architecte […]

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Autonomous Sensors for Measuring Continuously the Moisture and Salinity of a Porous Medium

Papers - Publications scientifiques

The article describes a new field sensor to monitor continuously in situ moisture and salinity of a porous medium via measurements of its dielectric permittivity, conductivity and temperature. It intends to overcome difficulties and biases encountered with sensors based on the same sensitivity principle. Permittivity and conductivity are determined simultaneously by a self-balanced bridge, which measures directly the admittance of […]

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pyGrav, a Python-based program for handling and processing relative gravity data

Papers - Publications scientifiques

pyGrav is a Python-based open-source software dedicated to the complete processing of relative-gravity data. It is particularly suited for time-lapse gravity surveys where high precision is sought. Its purpose is to bind together single-task processing codes in a user friendly interface for handy and fast treatment of raw gravity data from many stations of a network. The intuitive object-based implementation […]

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