Responsable du WP 8.2 Chercheur Sorbonne – Université Pierre et Marie Curie – Paris 6 Institut d’Ecologie et d’Environnement de Paris (IEES Paris) Aller sur la page de Mathieu Sebilo Aller voir la tâche CRITEX de Mathieu Sebilo
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Responsable WP 6.5 Enseignant-chercheur Ecole et Observatoire des Sciences de la Terre Aller sur la page de Pascal Sailhac Aller voir la tâche CRITEX de Pascal Sailhac
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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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The joint study of pressure (P-) and shear (S-) wave velocities (VP and VS), as well as their ratio (VP/VS), has been used for many years at large scales but remains marginal in near-surface applications. For these applications, VP and VS are generally retrieved with seismic refraction tomography combining P and SH (shear-horizontal) waves, thus requiring two separate acquisitions. Surface-wave […]
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While surface-wave prospecting methods are classically applied for the one-dimensional (1D) estimation of shear (S-) wave velocities (Vs), two-dimensional (2D) profiling still requires implementing specific processing and inversion tools that are not yet widely available in the community. We present here a free and open-source tool performing surface-wave inversion and profiling (SWIP) in order to retrieve 2D lateral variations of […]
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At the scale of a magnetic resonance sounding (MRS) field setup, the earth’s magnetic field in the subsurface may vary laterally with depth and over time. These variations can be caused by different natural factors and generally cannot be compensated for by accurate tuning of the measuring device. The varying geomagnetic field (GMF) causes nonresonance conditions of excitation that affect […]
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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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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. […]
Read moreEditorial Bonjour Bienvenue sur la newsletter 2015 de CRITEX. Comme en témoignent ces quelques pages, CRITEX prend de l’ampleur. A quelques mois de la fin des dépenses de la tranche d’Investissement, les différents instruments sont quasiment tous acquis, opérationnels ou en phase de test sur le terrain. Les premières résultats de notre programme ont été publiés dans des revues internationales […]
Read moreEditorial Bonjour Je suis heureux de vous présenter la deuxième newsletter de CRITEX. Merci à tous les porteurs de WP d’avoir rédigé quelques lignes sur l’état d’avancement de leurs acquisitions ou de leurs développements. Comme vous le constaterez, CRITEX est bel et bien parti grâce à l’engagement de tous. La quasi totalité des équipements est désormais acquise, le reste le […]
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