Preprints
https://doi.org/10.5194/hess-2021-238
https://doi.org/10.5194/hess-2021-238

  17 May 2021

17 May 2021

Review status: this preprint is currently under review for the journal HESS.

Feedback mechanisms between precipitation and dissolution reactions across randomly heterogeneous conductivity fields

Yaniv Edery1, Martin Stolar1, Giovanni Porta2, and Alberto Guadagnini2 Yaniv Edery et al.
  • 1Faculty of Civil and Environmental Engineering, Technion, Haifa, Israel
  • 2Department of Civil and Environmental Engineering, Politecnico di Milano, 20133, Milan, Italy

Abstract. Our study investigates interplays between dissolution, precipitation, and transport processes taking place across randomly heterogeneous conductivity domains and the ensuing spatial distribution of preferential pathways. We do so by relying on a collection of computational analyses of reactive transport performed in two-dimensional systems where the (natural) logarithm of conductivity is characterized by various degrees of spatial heterogeneity. Our results document that precipitation and dissolution jointly take place in the system, the latter mainly occurring along preferential flowpaths associated with the conductivity field, the former being observed at locations close to and clearly separated from these. High conductivity values associated with the preferential flowpaths tend to further increase in time, giving rise to a self-sustained feedback between transport and reaction processes. The clear separation between regions where dissolution or precipitation takes place is imprinted onto the sample distributions of conductivity which tend to become visibly left skewed with time (with the appearance of a bimodal behavior at some times). The link between conductivity changes and reaction-driven processes promotes the emergence of non-Fickian effective transport features. The latter can be captured through a continuous time random walk model where solute travel times are approximated with a truncated power law probability distribution. The parameters of such a model shift towards values associated with increasingly high non-Fickian effective transport behavior as time progresses.

Yaniv Edery et al.

Status: open (until 12 Jul 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on hess-2021-238', Philippe Ackerer, 02 Jun 2021 reply
  • RC2: 'Comment on hess-2021-238', Anonymous Referee #2, 07 Jun 2021 reply

Yaniv Edery et al.

Yaniv Edery et al.

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Short summary
The interplay between dissolution, precipitation, and transport are widely encountered in porous media, from CO2 storage to cave formation in carbonate rocks. We show that dissolution occurs along preferential flowpaths with high hydraulic conductivity, while precipitation occur at locations close yet separated from these flowpaths, thus, further funnelling the flow, and changing the probability density function of the transport, as measured on the altered conductivity field at various times.