1887

Abstract

Summary

Estimation of hydraulic parameters of the vadose zone is a relevant issue in hydrological characterization and flow model calibration. Two borehole Ground Penetrating Radar (GPR) techniques are discussed: Zero-Offset Profiling (ZOP) and Vertical Radar Profiling (VRP). The field case is representative of a very common situation in vadose zone characterization: above the water table, the permittivity inside the air-filled borehole is significantly smaller than in the embedding soil. In this case, if the first-arrivals are picked and the corresponding inversions are performed without a careful analysis, the recovered dielectric relative permittivity (εr) profiles are in large disagreement. The presented analysis of VRP synthetic and real datasets clarifies that the presence of the air-filled borehole may alter the propagation of electromagnetic waves, invalidating the comparison among VRP and ZOP first-arrivals. Once the borehole effects are accounted, the comparison between the ZOP and VRP εr-profiles is more reasonable and reveals the different resolution of these techniques, focusing on the information that can be inferred for hydrological characterizations. Thus, VRP surveys in vadose zone must be accurately interpreted, as the electromagnetic waves may propagate via “guided” modes along the borehole.

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/content/papers/10.3997/2214-4609.201702088
2017-09-03
2024-04-23
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References

  1. BrovelliA. and G.Cassiani
    , 2008, Effective permittivity of porous media: a critical analysis of the Complex Refractive Index Model (CRIM), Geophysical Prospecting, 2008, 56, 715–727, DOI:10.1111/j.1365‑2478.2008.00724.x.
    https://doi.org/10.1111/j.1365-2478.2008.00724.x. [Google Scholar]
  2. Burbery, L., G.Cassiani, G.Andreotti, T.Ricchiuto, and K. T.Semple
    , 2004, Well test and stable isotope analysis for the determination of sulphatereducing activity in a fast aquifer contaminated by hydrocarbons:Environmental Pollution, 129, no. 2, 321–330, doi:10.1016/j.envpol.2003.10.017.
    https://doi.org/10.1016/j.envpol.2003.10.017 [Google Scholar]
  3. Cassiani, G., C.Strobbia, L.Gallotti
    , 2004, Vertical radar profiles for the characterization of deep vadose zones, Vadose Zone Journal, 3, 1093–1115.
    [Google Scholar]
  4. Christensen, O., G., Cassiani, P.J.Diggle, P.Ribeiro and G.Andreotti
    , 2004, Statistical estimation of the relative efficiency of natural attenuation mechanisms in contaminated aquifers, Stochastic Environmental Research and Risk Assessment, 18, 339–350.
    [Google Scholar]
  5. Deiana, R., G.Cassiani, A.Villa, A.Bagliani, and V.Bruno
    , 2008, calibration of a vadose zone model using water injection monitored by GPR and electrical resistance tomography, Vadose Zone Journal, 7, 215–226. doi:10.2136/vzj2006.0137
    https://doi.org/10.2136/vzj2006.0137 [Google Scholar]
  6. Gerlitz, K., Knoll, M. D., Cross, G. M., Luzitano, R. D., Knight, R.
    , 1993, Processing ground penetrating radar data to improve resolution of the near-surface targets, Proceedings of the Symposium on the Application of Geophysics to Engineering and Environmental Problems.
    [Google Scholar]
  7. Irving, J.D., and R. J.Knight
    , 2006, Numerical simulation of antenna transmission and reception for crosshole ground-penetrating radar: Geophysics, 71, no. 2, K37–K45.
    [Google Scholar]
  8. Kästner, M., and G.Cassiani
    , 2009, ModelPROBE: Model driven soil probing, site assessment and evaluation: Reviews on Environmental Science and Biotechnology, 8, no. 2, 131–136, doi:10.1007/s11157‑009‑9157‑z.
    https://doi.org/10.1007/s11157-009-9157-z [Google Scholar]
  9. Rossi, M. G.Cassiani, and A.Binley
    , 2012, A stochastic analysis of cross-hole gpr zero-offset profiles for subsurface characterization, Vadose Zone Journal, Vadose Zone Journal, Vol. 11 No. 4.
    [Google Scholar]
  10. RothK., SchulinR., FluhlerH., HattingerW.
    ; 1990: Calibration of time domain reflectometry for water content measurements using a composite dielectric approach, Water Resources Research, 26(10), 2267–2273.
    [Google Scholar]
  11. RuckerD.F., T.P.A.Ferré
    , 2004, Correcting water content measurement errors associated with critically refracted first arrivals on zero offset profiling borehole ground penetrating radar profiles. Vadose Zone Journal, 3, 278–287.
    [Google Scholar]
  12. StrattonJ. A.
    1941, Electromagnetic Theory, McGraw-Hill Book Company, Inc., New York, NY and London, ISBN 07-062150-0.
    [Google Scholar]
  13. Topp, G.C., J.L.Davis, A.P.Annan
    , 1980, Electromagnetic determination of soil water content: Measurements in coaxial transmission lines. Water Resour. Res., 16, 574–582.
    [Google Scholar]
  14. Vignoli, G. R.Deiana, G.Cassiani
    , 2012, Focused inversion of vertical radar profile (VRP) traveltime data. Geophysics77, H9–H18.
    [Google Scholar]
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