Marie Boucher
University of Orléans
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Featured researches published by Marie Boucher.
Zeitschrift Fur Geomorphologie | 2010
Michael Ezersky; Anatoly Legchenko; Christian Camerlynck; Abdallah Al-Zoubi; Lev Eppelbaum; Shmariahu Keydar; Marie Boucher; Kostas Chalikakis
A geophysical study has been carried out in the Dead Sea (DS) coastal area of Israel and Jordan with the goal of better understanding the development of sinkholes in the area. The following surface geophysical methods have been applied: (1) Seismic Refraction method for mapping the buried salt formation; (2) Microgravity and Magnetic Resonance Sounding (MRS) for detecting cavities in the subsurface; (3) Transient Electromagnetic method (TEM) for estimating groundwater salinity. It has been found that: (1) sinkholes have formed within a strip 50-100 m wide along the salt formation edge; (2) a zone with a large density of cavities with a total volume of tens of thousands of cubic meters have been inferred in sinkhole sites; (3) cavities underlying sinkholes are filled with unconsolidated sediments locally reducing hydraulic conductivity. Further development of new cavities has not been detected; (4) groundwater salinity variations along the DS shore are insignificant and changes in the electrical conductivity of the groundwater obtained using TEM were in most cases related to changes of porosity caused by collapse of subsurface sediments. (5) the applied geophysical methods provide valuable data on the development of sinkholes in the DS coastal areas.
Ground Water | 2012
Marie Boucher; Guillaume Favreau; Yahaya Nazoumou; Bernard Cappelaere; Sylvain Massuel; Anatoly Legchenko
Magnetic resonance sounding (MRS) is a noninvasive geophysical method that allows estimating the free water content and transmissivity of aquifers. In this article, the ability of MRS to improve the reliability of a numerical groundwater model is assessed. Thirty-five sites were investigated by MRS over a ∼5000 km(2) domain of the sedimentary Continental Terminal aquifer in SW Niger. Time domain electromagnetic soundings were jointly carried out to estimate the aquifer thickness. A groundwater model was previously built for this section of the aquifer and forced by the outputs from a distributed surface hydrology model, to simulate the observed long-term (1992 to 2003) rise in the water table. Uncertainty analysis had shown that independent estimates of the free water content and transmissivity values of the aquifer would facilitate cross-evaluation of the surface-water and groundwater models. MRS results indicate ranges for permeability (K = 1 × 10(-5) to 3 × 10(-4) m/s) and for free water content (w = 5% to 23% m(3) /m(3) ) narrowed by two orders of magnitude (K) and by ∼50% (w), respectively, compared to the ranges of permeability and specific yield values previously considered. These shorter parameter ranges result in a reduction in the models equifinality (whereby multiple combinations of models parameters are able to represent the same observed piezometric levels), allowing a better constrained estimate to be derived for net aquifer recharge (∼22 mm/year).
Journal of Hydrology | 2009
Bernard Cappelaere; Luc Descroix; Thierry Lebel; Nicolas Boulain; David Ramier; Jean-Paul Laurent; Guillaume Favreau; Stéphane Boubkraoui; Marie Boucher; I. Bouzou Moussa; Véronique Chaffard; Pierre Hiernaux; Hassane Bil-Assanou Issoufou; E. Le Breton; I. Mamadou; Y. Nazoumou; Monique Oi; Catherine Ottlé; Guillaume Quantin
Comptes Rendus Geoscience | 2009
Roger Guérin; Jean-Michel Baltassat; Marie Boucher; Konstantinos Chalikakis; Pierre-Yves Galibert; Jean-François Girard; Valérie Plagnes; Rémi Valois
Journal of Applied Geophysics | 2008
Jean-Michel Vouillamoz; Guillaume Favreau; Sylvain Massuel; Marie Boucher; Yahaya Nazoumou; Anatoly Legchenko
Journal of Hydrology | 2006
Marie Boucher; Jean-François Girard; Anatoly Legchenko; Jean-Michel Baltassat; Nathalie Dörfliger; Konstantinos Chalikakis
Journal of Applied Geophysics | 2008
Anatoly Legchenko; Mikhail Ezersky; Jean-François Girard; Jean-Michel Baltassat; Marie Boucher; Christian Camerlynck; Abdallah Al-Zoubi
Journal of Applied Geophysics | 2007
Jean-François Girard; Marie Boucher; Anatoly Legchenko; Jean-Michel Baltassat
Journal of Applied Geophysics | 2008
Jean-François Girard; Anatoly Legchenko; Marie Boucher; Jean-Michel Baltassat
Archive | 2006
Marie Boucher; Guillaume Favreau; Sylvain Massuel; Jean-Michel Vouillamoz