Tag Archives: groundwater

Installation of a superconducting gravimeter at the Strengbach site (OHGE)

03 July 2017 A new generation superconducting gravimeter was installed by the EOST / IPG Strasbourg gravimetry team in a building of the TDF antenna on the summit of the Strengbach watershed in the Vosges Mountains (Observatoire HydroGéochimique de l’Environnement, OHGE). This instrument is one of the three superconducting gravimeters acquired as part of the CRITEX Excellence project, which also […]

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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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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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Evaluation and localization of an artificial drainage network by 3D time-lapse electrical resistivity tomography

Papers - Publications scientifiques

In France, 10 % of total arable land is equipped with subsurface drainage systems, to control winter and spring waterlogging due to a temporary perched water table. Most of these systems were installed in the 1980s and have aged since then and may now need maintenance. Sometimes, the location of the systems is known, but the standard situation in France […]

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SHYDRO2GEO-Spatialisation of Hydrological parameters using geophysical and geostatistical methods

Research on the Critical Zone (CZ) is a prerequisite for undertaking issues related to exosystemic services that human societies rely on (nutrient cycles, water supply and quality). However, while the upper part of CZ (vegetation, soil, surface water) is readily accessible, knowledge of the subsurface remains limited, due to the point-scale character of conventional direct observations. While the potential for […]

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Small-Scale Seismic Monitoring of Varying Water Levels in Granular Media

Papers - Publications scientifiques

Physical properties of soils in the vadose zone, and especially their water content, are characterized by strong spatial and temporal variations mostly driven by weather and anthropogenic activities. To understand this variability and help water resource management, seismic methods have been recently suggested as a complement to electrical and electromagnetic techniques. The simultaneous in situ estimation of pressure (P) and […]

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Distributed Temperature Sensing as a down-hole tool in hydrogeology

Papers - Publications scientifiques

Distributed Temperature Sensing (DTS) technology enables down-hole temperature monitoring to study hydrogeological processes at unprecedentedly high frequency and spatial resolution. DTS has been widely applied in passive mode in site investigations of groundwater ow, in-well flow, and subsurface thermal property estimation. However, recent years have seen the further development of the use of DTS in an active mode (A-DTS) for which heat sources are deployed. […]

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Using DGT passive samplers and MC-ICPMS to determine Pb and Zn isotopic signature of natural water

Papers - Publications scientifiques

Increasing numbers of studies use zinc (Zn) and lead (Pb) isotopic compositions to track anthropogenic pollutions in surface water and groundwater. However, given the low content in Pb and Zn in natural waters, we are often restricted for analysis by MC-ICPMS. One solution is to use passive Diffusive Gradients in Thin films (DGT) samplers for in-situ preconcentration of these metals. […]

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