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@ARTICLE{Wang:906308,
      author       = {Wang, Haoran and Lin, Chih-Ping and Mok, Ting Hin and Wu,
                      Po-Lin and Liu, Hsin-Chang},
      title        = {{H}igh-fidelity subsurface resistivity imaging
                      incorporating borehole measurements for monitoring
                      underground construction},
      journal      = {Engineering geology},
      volume       = {299},
      issn         = {0013-7952},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2022-01359},
      pages        = {106558 -},
      year         = {2022},
      abstract     = {Subsurface imaging by electrical resistivity tomography
                      (ERT) is increasingly used in geotechnical,
                      geo-environmental, and hydrogeological investigation and
                      monitoring. Cross-hole ERT (CHERT) is often used to avoid
                      loss of resolution with increasing depth. However, symmetric
                      artifacts may be induced because the measurement sensitivity
                      around boreholes for some electrode configurations is fairly
                      symmetric. This study aimed to investigate the best practice
                      of ERT for monitoring underground construction or process
                      through an actual scenario of ground improvement with jet
                      grouting columns. The limitation of conventional surface ERT
                      method was first vividly illustrated in an
                      easy-to-understand context. Characteristics and performances
                      of distinct types of CHERT configurations were then studied
                      considering different borehole spacings. Further
                      improvements were explored by evaluating various mixed
                      arrays, model resolution-optimized array, and the
                      comprehensive array. The results show the necessity of
                      mixing two distinct types of electrode configuration. Among
                      various combinations, a combination referred to as the
                      nominal optimal (NOPT) is recommended when imaging
                      resolution, the symmetric effect, and the measurement
                      efficiency are all factored in. Unexpectedly, the
                      resolution-based optimization does not lead to better
                      results and could even induce negative effects. The results
                      also show that the minimum aspect ratio of 2 may not be
                      large enough for imaging complex underground conditions due
                      to reduced sensitivity and increased 3D effect. The above
                      findings are justified by the eigenvalue spectrum of the
                      Hessian matrix, which is considered a better appraisal index
                      than the model resolution for CHERT.},
      cin          = {IBG-3},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {2173 - Agro-biogeosystems: controls, feedbacks and impact
                      (POF4-217)},
      pid          = {G:(DE-HGF)POF4-2173},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000804598200005},
      doi          = {10.1016/j.enggeo.2022.106558},
      url          = {https://juser.fz-juelich.de/record/906308},
}