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@ARTICLE{Wang:887680,
      author       = {Wang, Haoran and Lin, Chih-Ping and Liu, Hsin-Chang},
      title        = {{P}itfalls and refinement of 2{D} cross-hole electrical
                      resistivity tomography},
      journal      = {Journal of applied geophysics},
      volume       = {181},
      issn         = {0926-9851},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2020-04341},
      pages        = {104143 -},
      year         = {2020},
      abstract     = {As the conventional surface ERT method is limited by its
                      low resolution at depth, cross-hole electrical resistivity
                      tomography (CHERT) method is increasingly used in the field
                      of geo-environment and hydrogeology whenever possible.
                      Researches regarding CHERT configurations and some negative
                      effects in this method have been useful in survey planning
                      and data interpretation. Nevertheless, some issues remained
                      to be resolved before a standard guideline can be drawn up
                      for conducting CHERT. The symmetric effect was recently
                      pointed out as a major issue in resistivity tomography
                      involving borehole measurements including both
                      borehole-to-surface and cross-hole methods. Symmetrical
                      artifacts emerge for certain types of electrode
                      configuration, which are often desired for better
                      resolution. In this study, the symmetric effect was further
                      investigated in a general two-hole CHERT layout, which is
                      more frequently used in the field. The influence of
                      symmetric effect is found to manifest when the assumption of
                      boundary condition in the inversion is incorrect. The effect
                      of electrode configuration and inversion scheme was further
                      examined and the extended inversion model was found to be
                      more suitable for CHERT data inversion. In particular, the
                      optimal extended range outside the boreholes on each side
                      was shown to be 0.25 times the borehole depth. To mitigate
                      the symmetric effect, a more practical optimal array was
                      proposed. These new suggestions were further verified by a
                      field example.},
      cin          = {IBG-3},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255)},
      pid          = {G:(DE-HGF)POF3-255},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000580644500013},
      doi          = {10.1016/j.jappgeo.2020.104143},
      url          = {https://juser.fz-juelich.de/record/887680},
}