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@ARTICLE{Caterina:829544,
      author       = {Caterina, David and Flores-Orozco, Adrian and Nguyen,
                      Frédéric},
      title        = {{L}ong-term {ERT} monitoring of biogeochemical changes of
                      an aged hydrocarbon contamination},
      journal      = {Journal of contaminant hydrology},
      volume       = {201},
      issn         = {0169-7722},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2017-03229},
      pages        = {19–29},
      year         = {2017},
      abstract     = {Adequate management of contaminated sites requires
                      information with improved spatio-temporal resolution, in
                      particular to assess bio-geochemical processes, such as the
                      transformation and degradation of contaminants,
                      precipitation of minerals or changes in groundwater
                      geochemistry occurring during and after remediation
                      procedures. Electrical Resistivity Tomography (ERT), a
                      geophysical method sensitive to pore-fluid and pore-geometry
                      properties, permits to gain quasi-continuous information
                      about subsurface properties in real-time and has been
                      consequently widely used for the characterization of
                      hydrocarbon-impacted sediments. However, its application for
                      the long-term monitoring of processes accompanying natural
                      or engineered bioremediation is still difficult due to the
                      poor understanding of the role that biogeochemical processes
                      play in the electrical signatures. For in-situ studies, the
                      task is further complicated by the variable signal-to-noise
                      ratio and the variations of environmental parameters leading
                      to resolution changes in the electrical images. In this
                      work, we present ERT imaging results for data collected over
                      a period of two years on a site affected by a diesel fuel
                      contamination and undergoing bioremediation. We report low
                      electrical resistivity anomalies in areas associated to the
                      highest contaminant concentrations likely due
                      transformations of the contaminant due to microbial activity
                      and accompanying release of metabolic products. We also
                      report large seasonal variations of the bulk electrical
                      resistivity in the contaminated areas in correlation with
                      temperature and groundwater level fluctuations. However, the
                      amplitude of bulk electrical resistivity variations largely
                      exceeds the amplitude expected given existing petrophysical
                      models. Our results suggest that the variations in
                      electrical properties are mainly controlled by microbial
                      activity which in turn depends on soil temperature and
                      hydrogeological conditions. Therefore, ERT can be suggested
                      as a promising tool to track microbial activity during
                      bioremediation even though further research is still needed
                      to completely understand the bio-geochemical processes
                      involved and their impact on electrical signatures.},
      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:000402211600003},
      pubmed       = {pmid:28442237},
      doi          = {10.1016/j.jconhyd.2017.04.003},
      url          = {https://juser.fz-juelich.de/record/829544},
}