Time-lapse magnetic resonance sounding measurements for numerical modeling of water flow in variably saturated media

Anatoly Legchenko, Jean Michel Baltassat, Céline Duwig, Marie Boucher, Jean François Girard, Alvaro Soruco, Alain Beauce, Francis Mathieu, Cedric Legout, Marc Descloitres, Flores Avilès Gabriela Patricia

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10 Scopus citations

Abstract

We presented an innovative hydrogeophysical approach that allows numerical modeling of water flow in a variably saturated media. In our model, we approximated the subsurface by horizontally stratified porous media. The model output was a time varying water content profile. Then, we compared the water content provided by the model with the water content measurements carried out using the time-lapse Magnetic Resonance Sounding (MRS) method. Each MRS sounding provided a water content profile in the unsaturated zone down to twenty meters. The time shift between the profiles corresponded to the time lapse between individual MRS soundings. We minimized the discrepancy between the observed and the modeled MRS signals by varying hydraulic parameters of soil layers in the water flow model. For measuring and processing MRS data, we used NUMIS MRS instrument and SAMOVAR software. We carried out water flow modeling with HYDRUS-1D software. This paper reports our results and summarizes the limitations of the MRS method applied to water content measurements in the unsaturated zone.

Original languageEnglish
Article number103984
JournalJournal of Applied Geophysics
Volume175
DOIs
StatePublished - Apr 2020

Bibliographical note

Funding Information:
The authors carried out this study in the laboratory IGE - IRD (Grenoble) with the support of the BRGM and the IRD research programs. We acknowledge financial support from Labex OSUG@2020 (Investissements d'avenir – ANR10 LABX56) and the French National Program (ANR) “Investment for Future - Excellency Equipment” project EQUIPEX CRITEX (grant # ANR-11-EQPX-0011). We are thankful to Dr. Maciek Lubczynski and two anonymous reviewers for their critical comments that helped us to improve presentation of our results.

Publisher Copyright:
© 2020 Elsevier B.V.

Keywords

  • Beauce
  • Hydrodynamic modeling
  • MRS
  • Time-lapse
  • Villamblain

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