Tag Archives: Eaux souterraines

Conférence Goldschmidt : cette année à Paris!

La conférence Goldschmidt est la plus importante conférence internationale organisée par l’Association Européenne de Géochimie et la Société de Géochimie. L’édition 2017 aura lieu à Paris du 13 au 18 aout 2017. Plus de 3600 résumés sont attendus, avec plus de 4000 participants. Une session dédiée à l’environnement est prévue. More information: https://goldschmidt.info/2017/index Biogeochemistry is dynamic and involves cycling or […]

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Field Continuous Measurement of Dissolved Gases with a CF-MIMS: Applications to the Physics and Biogeochemistry of Groundwater Flow

In the perspective of a temporal and spatial exploration of aquatic environments (surface and groundwater), we developed a technique for field continuous measurements of dissolved gases with a precision better than 1% for N2, O2, CO2, He, Ar, 2% for Kr, 8% for Xe, and 3% for CH4, N2O and Ne. With a large resolution (from 1 × 10–9 to […]

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Publications, WP8 , , ,

Active-Distributed Temperature Sensing to continuously quantify vertical flow in boreholes

We show how a distributed borehole flowmeter can be created from armored Fiber Optic cables with the Active-Distributed Temperature Sensing (A-DTS) method. The principle is that in a flowing fluid, the difference in temperature between a heated and unheated cable is a function of the fluid velocity. We outline the physical basis of the methodology and report on the deployment […]

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Publications, WP3 , , ,

Detecting different water table levels in a shallow aquifer with combined P-, surface and SH-wave surveys: Insights from VP/VS or Poisson’s ratios

When applied to hydrogeology, seismicmethods are generally confined to the characterisation of aquifer geometry. The joint study of pressure- (P) and shear- (S) wave velocities (VP and VS) can provide supplementary information and improve the understanding of aquifer systems. This approach is proposed here with the estimation of VP/VS ratios in a stratified aquifer system characterised by tabular layers, well-delineated […]

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Publications, WP6 , , , ,

Thermal-plume fibre optic tracking (T-POT) test for flow velocity measurement in groundwater boreholes

We develop an approach for measuring in-well fluid velocities using point electrical heating combined with spatially and temporally continuous temperature monitoring using distributed temperature sensing (DTS). The method uses a point heater to warm a discrete volume of water. The rate of advection of this plume, once the heating is stopped, equates to the average flow velocity in the well. […]

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Publications, WP3 ,

ENIGMA Innovative Training Network: 15 thèses à pourvoir

Le projet d’ITN ENIGMA (European training Network for in situ imaGing of dynaMic processes in heterogeneous subsurfAce environments) vise à former une nouvelle génération de chercheurs sur le développement de méthodes innovantes d’imagerie pour mieux contraindre les processus dynamiques dans les systèmes hydrologiques de subsurface, d’améliorer le caractère prédictif des modèles et de transférer ces innovations à la sphère socio-économique. […]

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Contribution of Magnetic Resonance Soundings for characterizing water storage in the unsaturated zone of karst aquifers

Understanding the role of the unsaturated zone in aquifer recharge and contaminant attenuation processes is a major challenge for the protection and management of karstic water resources. We present the potential of the MRS (Magnetic Resonance Soundings) geophysical method for characterizing the vadose zone of karst aquifers composed of epikarst and infiltration layers. To investigate the hydraulic functioning of the Durzon karst system located […]

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Équipements, Publications, WP6 , , , , , ,

Permanent electrical resistivity measurements for monitoring water circulation in clayey landslides

Papers - Publications scientifiques

Landslides developed on clay-rich slopes are controlled by the soilwater regimeand the groundwater circulation. Spatially-distributed and high frequency observations of these hydrological processes are important for improving our understanding and prediction of landslide triggering. This work presents observed changes in electrical resistivity monitored at the Super-Sauze clayey landslide with the GEOMON 4D resistivity instrument installed permanently on-site for a period of one year. A […]

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The Earth’s Critical Zone, Geochemistry of the Earth’s Surface meeting, GES – 10

The next Geochemistry of the Earth’s Surface meeting (GES 10) will be held in the center of Paris, France, between August 18th and 22nd, 2014. GES 10 will emphasize Critical Zone cutting edge research at all scales, from the elementary processes to global biogeochemical cycles. The GES meeting is a small-size, friendly meeting (< 200 attendees) featuring a limited number […]

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