• 228 Citations
  • 8 h-Index

Research output per year

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Personal profile

Research Biography

Ilka Wallis is a hydrogeologist with areas of expertise in quantitative hydrogeology and geochemistry. Ilka focuses on the development of reactive geochemical transport models which integrate fundamental processes that are normally studied in isolation (hydrogeological, mineralogical, geochemical and biochemical). Areas of specialisation include the assessment and prediction of the variability of the redox zonation in aquifers, the corresponding impact on the fate of pollutants (such as nitrate), water quality changes during managed aquifer recharge, incorporation of environmental tracer data into geochemical reaction networks (age indicators, such as Helium/Tritium), the mobilisation and remediation of metals (such as arsenic) and the quantifying of feedback mechanisms between chemical reactions and physical flow in aquifer systems.

Ilka obtained her MSc at Christian-Albrechts-University Kiel, Germany and her PhD at Flinders University, specialising on the quantification of arsenic mobilisation and attenuation by coupled flow and multi-component reactive transport modelling. In the past, Ilka Wallis worked at the Geological Surveys of South Africa, Great Britain and Germany and at Aquaterra Simulations Pty, Australia and has lectured at Rhodes University, South Africa, the University of Pretoria, South Africa and Bremen University, Germany.

Ilka was an associate editor for "Hydrogeology Journal" from 2013 to 2018.

Ilka is an Adjunct Professor, Department of Civil Engineering, University of Manitoba, Canada since 2017

Ilka has been nominated DFG Mercator Fellow, funded by the German Research Foundation (DFG) for 3 years (July 2018 - July 2021)

Research Interests

Applied research in hydrogeology, flow/solute/reactive transport modelling in hydrogeologically and geochemically heterogeneous aquifer systems, with special emphasis on contaminant hydrology.

Current research projects:

"Chronology of Groundwater Salinity Hotspots, Mt Lofty Ranges, South Australia". ANSTO Research Grant 10724 (2017 - 2018)

€œRetardation and mobilization of arsenic at redox fronts under advective flow conditions - a concerted multidisciplinary approach (AdvectAs). €œ International cooperation partner in project funded through Germand and Swiss Research Foundation (DFG, SNF). In collaboration with Uni. of Tuebingen, Karlsruher Institue for Technology and EAWAG Switzerland; (2016 - 2019).

€œQuantification of governing geochemical reactions, which control leachate water quality at the Brukunga Mine site South Australia €. In collaboration with the Department of State Development, SA. Since 2017-

€œBusan Aquifer Storage and Recovery Scheme, South Korea € Reactive transport modelling to investigate the hydrochemical response to injection (collaboration with KIST, South Korean Institute of Science and Technology, Seoul.) Since 2017-

"Mobilization mechanisms of geogenic molybdenum €. DFG research project nr: 403725837 (July 2018 - July 2021).

Current RHD students:

Cassady O'Neill (masters): Imprint of mineral deposits on natural hydrochemistry. Collabroative research with the Geological Survey of Victoria

Joshua Edwards (masters): Leachate water quality at the Brukunga Mine site South Australia. Collaborative research with DSD, Department of State Development.

Sian Kennare (masters): Water Resources of the Willochra Basin, SA . Collaborative research with DEW, Department for Environment and Water

Completed RHD students:

Micha Roemer (masters): In-situ immobilisation of arsenic in the subsurface using ferric chloride. Collaborative research with the University of Manitoba, Canada.

Julian Wecht (masters): Arsenic and Molybdenum mobilisation in a limestone aquifer following drilling. Collaborative research with Bremen University, Germany.

Marianna Ramirez Lagunas (masters): Groundwater discharge to sea using near surface geophysics, EC and temperature measurements.

Andrew Joloza (masters):Hydrochemical characterisation of groundwater in the major aquifers in Malawi

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Research Output

  • 228 Citations
  • 8 h-Index
  • 18 Article
  • 5 Paper
  • 1 Chapter
  • 1 Conference contribution

Spatiotemporal Evolution of Iron and Sulfate Concentrations during Riverbank Filtration: Field Observations and Reactive Transport Modeling

Lee, W., Bresciani, E., An, S., Wallis, I., Post, V., Lee, S. & Kang, P. K., Mar 2020, (Submitted) In : Journal of Contaminant Hydrology. 234, 13 p., 103697.

Research output: Contribution to journalArticle

  • The river–groundwater interface as a hotspot for arsenic release

    Wallis, I., Prommer, H., Berg, M., Siade, A., Sun, J. & Kipfer, R., 7 Apr 2020, In : Nature Geoscience. 13, p. 288-295 8 p.

    Research output: Contribution to journalArticle

  • 2 Citations (Scopus)

    Salinity balance and historical flushing quantified in a high-rainfall catchment (Mount Lofty Ranges, South Australia)

    Translated title of the contribution: Salinity balance and historical flushing quantified in a high-rainfall catchment (Mount Lofty Ranges, South Australia)Anderson, T., Bestland, E., Wallis, I. & Guan, H., Jun 2019, In : Hydrogeology Journal. 27, 4, p. 1229-1244 16 p.

    Research output: Contribution to journalArticle

  • Trace metal behavior during in-situ iron removal tests in Leuven, Belgium

    Vandenbohede, A., Wallis, I. & Alleman, T., 2019, In : Science of The Total Environment. 648, p. 367-376 10 p.

    Research output: Contribution to journalArticle

  • 2 Citations (Scopus)

    AdvectAs challenge: Multidisciplinary research on groundwater arsenic dissolution, transport, and retardation under advective flow conditions

    Stopelli, E., Lightfoot, A., Kipfer, R., Berg, M., Winkel, L. H. E., Glodowska, M., Patzner, M., Rathi, B., Cirpka, O., Kappler, A., Schneider, M., Eiche, E., Kontny, A., Neumann, T., Prommer, H., Wallis, I., Vu, D., Tran, M., Viet, N., Lan, V. M. & 2 others, Trang, P. K. & Viet, P. H., 2018, Environmental Arsenic in a Changing World: Proceedings of the 7th International Congress and Exhibition on Arsenic in the Environment. Zhu, Y-G., Guo, H., Bhattacharya, P., Bundschuh, J., Ahmad, A. & Naidu, R. (eds.). London: CRC Press/Balkema, p. 29-31 3 p. (Arsenic in the Environment – Proceedings).

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Open Access
  • Activities

    • 8 Publication Peer-review
    • 2 Editorial work
    • 1 Invited talk

    Frontiers in Water (Journal)

    Ilka Wallis (Reviewer)

    2019 → …

    Activity: Publication peer-review and editorial work typesEditorial work

    Scientific Reports (Journal)

    Ilka Wallis (Reviewer)

    2019 → …

    Activity: Publication peer-review and editorial work typesPublication Peer-review

    Applied Geochemistry (Journal)

    Ilka Wallis (Reviewer)

    2018 → …

    Activity: Publication peer-review and editorial work typesPublication Peer-review

    Journal of Hydrology (Journal)

    Ilka Wallis (Reviewer)


    Activity: Publication peer-review and editorial work typesPublication Peer-review