Characterization and high resolution mapping of soil hydrogeophysical properties from ground penetrating radar and electromagnetic induction data in a vineyard in southern France

André, Frédéric;Saussez, Stéphanie;Van Durmen, Renaud;van Leeuwen, Cornelis;Lambot, Sébastien;et.al.
(2010) AGU General Assembly 2010 — Location: San Francisco, USA (13.December.2010)

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Authors
  • André, FrédéricUCLouvain
    Author
  • Saussez, StéphanieUCLouvain
    Author
  • Van Durmen, RenaudUCLouvain
    Author
  • van Leeuwen, CornelisENITA de Borbeaux
    Author
  • Moghadas, DavoodUCLouvain
    Author
  • Delvaux, BrunoUCLouvain
    Author
  • Lambot, SébastienUCLouvain
    Author
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Abstract
Soil and climate are acknowledged to greatly affect vine growth and grape berry composition through their strong influence on vine water status. Over a limited area, climatic factors may be considered as rather homogeneous for a given vintage while soil characteristics may vary strongly over short distances. Therefore, detailed characterization of soil hydrogeophysical properties is of prime importance for the definition of optimal vineyard practices. In that respect, ground penetrating radar (GPR) and electromagnetic induction (EMI) are effective geophysical techniques for fast and non-invasive determination of shallow subsurface properties through the measurement of soil dielectric permittivity and electrical conductivity. Given contrasted sensitivities of GPR and EMI to soil electrical properties, combining measurements from both techniques allows to merge complementary information, thereby leading to more accurate quantitative characterisation of soil. Classical GPR and EMI data processing techniques for soil properties characterisation rely on strongly simplifying assumptions in the modelling of electromagnetic phenomena, leading to significant errors on the estimates and accounting for only a part of the data information content. We developed generalized multi-offset full-waveform approaches for modelling off-ground and on-ground GPR and EMI signals. GPR and EMI systems are modelled using sets of infinitesimal electric and magnetic dipoles, allowing us to properly describe the distribution of the scattered field when the subsurface is located in the near-field of the antenna. The antenna model is coupled with a three-dimensional Green’s function, corresponding to a specific solution of the Maxwell’s equations for wave propagation or diffusion in multilayered media. The approaches were applied in a vineyard in south of France (Saint-Emilion) over a 30-ha area characterized by strong spatial variations of soil types. Around 1 million GPR waveforms and 73 000 EMI measurements were collected. GPR data were acquired with a time-domain system with two bistatic ground-coupled antennas of 400 MHz centre frequency. EMI measurements were performed with a Profiler sensor operating in vertical dipole orientation at three frequencies (5, 10 and 15 kHz). GPR and EMI results were consistent and were in accordance with the distribution of the different soil types in the study area, thereby demonstrating the promising perspectives of the method.
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André, F., Saussez, S., Van Durmen, R., van Leeuwen, C., Moghadas, D., Delvaux, B., Vereecken, H., & Lambot, S. (2010). Characterization and high resolution mapping of soil hydrogeophysical properties from ground penetrating radar and electromagnetic induction data in a vineyard in southern France. AGU General Assembly 2010, San Francisco, USA. https://hdl.handle.net/2078.5/151115