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@ARTICLE{Lnartz:1019573,
      author       = {Lönartz, Mara I. and Yang, Yuankai and Deissmann, Guido
                      and Bosbach, Dirk and Poonoosamy, Jenna},
      title        = {{C}apturing the {D}ynamic {P}rocesses of {P}orosity
                      {C}logging},
      journal      = {Water resources research},
      volume       = {59},
      number       = {11},
      issn         = {0043-1397},
      address      = {[New York]},
      publisher    = {Wiley},
      reportid     = {FZJ-2023-05508},
      pages        = {e2023WR034722},
      year         = {2023},
      abstract     = {Understanding geochemical processes and their impact
                      onmacroscopic transport properties of porous media is
                      essential fordescribing the long-term evolution of various
                      subsurfacesystems. Chemical and thermal gradients promote
                      mineralprecipitation reactions in porous media, resulting in
                      a reductionof porosity and potentially clogging transport
                      pathways ofsolutes. Commonly applied porosity-diffusivity
                      relationships incontinuum-scale reactive transport modelling
                      based on Archie’slaw and extended versions thereof
                      describe the case of cloggingas a final state, setting the
                      effective diffusivity to a negligible lowvalue. However,
                      recent experiments and pore-scale modellinginvestigations
                      demonstrated the limitations of empirical laws inpredicting
                      effective transport properties in response to aprecipitation
                      induced porosity reduction and pore clogging,suggesting a
                      non-negligible inherent diffusivity of
                      newly-formedprecipitates. To verify this hypothesis, we
                      developed amicrofluidic reactor design that combines
                      time-lapse opticalmicroscopy and confocal Raman
                      spectroscopy, providing realtimeinsights into mineral
                      precipitation induced porosity cloggingunder purely
                      diffusive transport conditions, using theprecipitation of
                      celestine (SrSO4) as a model system (Figure 1a).As the pore
                      network became clogged, isotopic tracer diffusionexperiments
                      were conducted and monitored by Ramanspectroscopy to
                      visualize the transport of deuterium through theevolving
                      microporosity of the precipitates, demonstrating
                      thenon-final state of clogging (Figure 1b). The evolution of
                      theporosity-diffusivity relation in response to
                      precipitation reactionsshows an increasingly deviating
                      behavior to Archie’s law. Theapplication of an extended
                      power law improved the descriptionof the evolving
                      porosity-diffusivity relation, but still
                      neglectedpost-clogging features. Currently, we develop
                      microfluidicsetups to answer the question how
                      clogging-related processesdepend on initial pore geometries.
                      The combination ofmicrofluidic experiments and pore-scale
                      modelling opens newpossibilities to identify and validate
                      relevant pore-scaleprocesses, providing data for upscaling
                      approaches and to derivekey relationships for
                      continuum-scale reactive transportsimulations.},
      cin          = {IEK-6},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-6-20101013},
      pnm          = {1411 - Nuclear Waste Disposal (POF4-141)},
      pid          = {G:(DE-HGF)POF4-1411},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001106027500001},
      doi          = {10.1029/2023WR034722},
      url          = {https://juser.fz-juelich.de/record/1019573},
}