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Constraining Groundwater Modeling with Magnetic Resonance Soundings

Ground Water, September 2012, Vol.50(5), pp.775-784 [Peer Reviewed Journal]

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  • Title:
    Constraining Groundwater Modeling with Magnetic Resonance Soundings
  • Author: Boucher, M. ; Favreau, G. ; Nazoumou, Y. ; Cappelaere, B. ; Massuel, S. ; Legchenko, A.
  • Found In: Ground Water, September 2012, Vol.50(5), pp.775-784 [Peer Reviewed Journal]
  • Subjects: Hydrogeology ; Africa ; Aquifers ; Calibration ; Characterization ; Geophysical Methods ; Ground Water ; Hydrodynamics ; Hydrology ; Models ; Niamey Niger ; Niger ; Niger River ; Nuclear Magnetic Resonance ; Numerical Models ; Permeability ; Pump Tests ; Simulation ; Sounding ; Spectroscopy ; Statistical Analysis ; Time Domain Analysis ; Transmissivity ; Uncertainty ; Variance Analysis ; Variograms ; Water Resources ; West Africa
  • Rights: Copyright 2013 Elsevier B.V., All rights reserved. ; MEDLINE® is the source for the MeSH terms of this document.
  • Description: 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 approximately 5000 km (super 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 X 10 (super -5) to 3 X 10 (super -4) m/s) and for free water content (w = 5% to 23% m (super 3) /m (super 3) ) narrowed by two orders of magnitude (K) and by approximately 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 ( approximately 22 mm/year). Abstract Copyright (2011), National Ground Water Association.
  • Identifier: ISSN: 0017467X ; E-ISSN: 17456584 ; DOI: 10.1111/j.1745-6584.2011.00891.x

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