Publications

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 […]

Publications geodesy, Géophysique, Hydrogéophysique, modélisation, Outil, Programmation

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 […]

Publications Hydrogéologie, Hydrogéophysique, Salinité, transport

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 […]

Publications fractures, Hydrogéologie, Hydrologie, Température

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 […]

Publications Eaux souterraines, Ecologie, Salinité, Température

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

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 […]

Publications, WP2 Capteur, Eaux souterraines, Haute fréquence, Humidité, Instrument, Outil, Salinité, Sol, Température

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

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 […]

Publications, WP2 Hydrogéologie, modélisation, Programmation

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

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 […]

Publications, WP6 Bassin versant, Eaux souterraines, géodésie, Hydrogéophysique, Hydrologie

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

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 […]

Publications, WP6 Eaux souterraines, Géophysique, Hydrogéophysique, Sol

2D characterization of near-surface VP/VS: surface-wave dispersion inversion versus refraction tomography

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 […]

Publications, WP6 Géophysique, Hydrogéophysique

Integrated Workflow for Surface-wave Dispersion Inversion and Profiling

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 […]

Publications, WP6 Géophysique

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