HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Journal articles

Constraining Groundwater Modeling with Magnetic Resonance Soundings

Marie Boucher 1 Guillaume Favreau 2 Yahaya Nazoumou 2 B. Cappelaere 3 Sylvain Massuel 4 Anatoly Legchenko 5
LTHE - Laboratoire d'étude des transferts en hydrologie et environnement, Department of Applied Geophysics
LTHE - Laboratoire d'étude des transferts en hydrologie et environnement
Résumé : 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 km2 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% m3/m3) 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 model's equifinality (whereby multiple combinations of model's 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).
Document type :
Journal articles
Complete list of metadata

Contributor : Pascale Talour Connect in order to contact the contributor
Submitted on : Friday, December 2, 2011 - 4:07:19 PM
Last modification on : Monday, April 4, 2022 - 6:22:23 PM

Links full text



Marie Boucher, Guillaume Favreau, Yahaya Nazoumou, B. Cappelaere, Sylvain Massuel, et al.. Constraining Groundwater Modeling with Magnetic Resonance Soundings. Groundwater, Wiley, 2012, 50 (5), pp.775-784. ⟨10.1111/j.1745-6584.2011.00891.x⟩. ⟨insu-00647782⟩



Record views