Tag Archives: hydrogeophysics

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

SWIP is a toolbox developed by Sylvain Pasquet, providing an integrated workflow for surface-wave dispersion inversion and profiling, recently successfully applied to the CZ imaging. A tutorial has been published in Geophysics: Sylvain Pasquet and Ludovic Bodet (2017). ”SWIP: An integrated workflow for surface-wave dispersion inversion and profiling.” GEOPHYSICS, 82(6), WB47-WB61. https://doi.org/10.1190/geo2016-0625.1 The code is available at the following link: […]

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

Papers - Publications scientifiques

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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3rd AGU-SEG Hydrogeophysics Workshop: Imaging the Critical Zone

  The 3rd AGU-SEG Hydrogeophysics Workshop – Imaging the Critical Zone – will be held in Stanford, California, next 24-27 July 2017.   The Critical Zone (CZ) is a dynamic region where rock, soil, water, air, and living biota interact to shape Earth’s surface. The Critical Zone ranges from the tops of the trees to the bottom of groundwater. The field […]

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