Stephan Seibert

Stephan Seibert

Institute for Biology and Environmental Sciences  (» Postal address)

A3 1-113 (» Adress and map )

+49 441 798-3285  (F&P

Stephan Seibert

Research scientist

Research interests

My research interests lie primarily in the study of hydrogeologic processes in porous coastal aquifers. In doing so, I use both field and computational modeling methods (MODFLOW, MT3DMS, SEAWAT, PHREEQC, PHT3D, iMOD-WQ) to improve the understanding of groundwater flow as well as hydrobiogeochemistry. My previous research work includes:

- Investigating hydrogeochemical processes in freshwater lenses below barrier islands

- Investigation of hydrogeochemical processes in sandy beach and marsh sediments at the land/sea transition zone

- Paleo-reconstructions of historical salt distributions in coastal aquifers

- Assessing the impact of climate-related factors on future salinity distributions in coastal aquifers

Curriculum vitae

08/2021 - Now Research scientist in the DFG-Project “DynaDeep - The Dynamic Deep Subsurface of
  High-Energy Beaches / Subproject P6: Field scale reactive transport”, Hydrogeology and Landscape Hydrology, Carl von Ossietzky University Oldenburg

06/2020 - 07/2021

Research scientist in the BMBF-Project “Water at the coasts of East Frisia: Base for

  customized climate services for adaptation / Subproject WAKOS-E: Freshwater on the islands and regional adaptation strategies”, Hydrogeology and Landscape Hydrology, Carl von Ossietzky University Oldenburg

03/2019 - 05/2020

Research scientist in the DFG-Project “SPP Sea Level: Groundwater

  salinisation following sea level rise as a societal challenge of climate adaptation - The case of North-Western Germany”, Hydrogeology and Landscape Hydrology, Carl von Ossietzky University Oldenburg


Dissertation, Carl von Ossietzky University Oldenburg


Thesis topic:


"Hydrogeochemical Processes in a Barrier Island Aquifer (Spiekeroog, Northwest Germany)"


Research visit at CSIRO Land and Water, Perth, Australia

09/2015 - 02/2019

Research scientist in the DFG-Project “Chronosequential initial evolution of soils and

  freshwater resources of a barrier island (example Ostplate Spiekeroog)”, Hydrogeology and Landscape Hydrology, Carl von Ossietzky University Oldenburg

09/2013 - 08/2015

M.Sc. Environmental Engineering, Denmarks Technical University (DTU), Kongens Lyngby


Thesis topic:


"Assessing the driving forces of trichloroethylene transport in a glacial-disturbed limestone aquifer"

12/2012 - 05/2013

Industrial Trainee at CSIRO Land and Water, Adelaide, Australia

01/2012 - 06/2012

Exchange semester at Södertörns Högskola, Huddinge, Sweden

10/2009 - 02/2013

B.Sc. Environmental Sciences, Carl von Ossietzky University Oldenburg


Thesis topic:


"Characterization and mapping of the freshwater-saltwater interface below the western part of Spiekeroog by means of stable isotopes and hydrochemical methods"



Greskowiak, J., Seibert, S.L., Post, V.E.A., Massmann, G., 2023. Redox-zoning in high-energy subterranean estuaries as a function of storm floods, temperatures, seasonal groundwater recharge and morphodynamics. Estuarine, Coastal and Shelf Science290, p.108418.

Massmann, G., Abarike, G., Amoako, K., Auer, F., Badewien, T., Berkenbrink, C., Böttcher, M.E., Brick, S., Medina Cordova, I.V., Cueto, J., Dittmar, T., Engelen, B., Freund, H. Greskowiak, J., Günther, T., Herbst, G., Holtappels, M., Marchant, H., Meyer, R., Müller-Petke, M., Niggemann, J., Pahnke, K., Pommerin, D., Post, V., Reckhardt, A., Roberts, M., Schwalfenberg, K., Seibert, S.L., Siebert, C., Skibbe, N., Waska, H., Winter, C., Zielinski, O., 2023. The DynaDeep observatory – a unique approach to study high-energy subterranean estuaries. Frontiers in Marine Science10, p.1189281.

Karrasch, L., Siebenhüner, B., Seibert, S.L., 2023. Groundwater salinization in northwestern Germany: A case of anticipatory governance in the field of climate adaptation?. Earth System Governance, 17, p.100179.

Seibert, S.L., Greskowiak, J., Bungenstock, F., Freund, H., Karle, M., Meyer, R., Oude Essink, G.H.P., Van Engelen, J., Massmann, G., 2023. Paleo-Hydrogeological Modeling to Understand Present-Day Groundwater Salinities in a Low-Lying Coastal Groundwater System (Northwestern Germany). Water Resources Research, 59(4).

Waska, H., Simon, H., Ahmerkamp, S., Greskowiak, J., Ahrens, J., Seibert, S.L., Schwalfenberg, K., Zielinski, O., Dittmar, T., 2021. Molecular Traits of Dissolved Organic Matter in the Subterranean Estuary of a High-Energy Beach: Indications of Sources and Sinks. Frontiers in Marine Science 8, 54.

Seibert, S.L., Böttcher, M.E., Waska, H., Holt, T., Pollmann, T., Greskowiak, J., Massmann, G, 2021. Hydrogeochemistry of near-surface groundwater on a developing barrier island (Spiekeroog, Germany): The role of inundation, season and vegetation. Journal of Hydrology 597, 126139.

Reckhardt, A., Seibert, S.L., Holt, T., Ahrens, J., Beck, M., Massmann, G., Brumsack, H.J., 2021. Cycling of redox-sensitive trace metals in barrier island freshwater lenses. Science of The Total Environment 768, 144964.

Seibert, S.L., Degenhardt, J., Ahrens, J., Reckhardt, A., Schwalfenberg, K., Waska, H., 2020. Investigating the Land-Sea Transition Zone. In: Jungblut, S., Liebich, V., Bode-Dalby, M. (eds) YOUMARES 9 - The Oceans: Our Research, Our Future. Springer, Cham.

Seibert, S.L., Greskowiak, J., Prommer, H., Böttcher, M.E., Massmann, G, 2019. Modeling of biogeochemical processes in a barrier island freshwater lens (Spiekeroog, Germany). Journal of Hydrology 575, 1133-1144.

Holt, T., Greskowiak, J., Seibert, S.L., Massmann, G, 2019. Modeling the evolution of a freshwater lens under highly dynamic conditions on a currently developing barrier island. Geofluids, open-access article ID 9484657.

Seibert, S.L., Böttcher, M.E., Schubert, F., Pollmann, T., Giani, L., Tsukamoto, S., Frechen, M., Freund, H., Waska, H., Simon, H., Holt, T., Greskowiak, J., Massmann, G., 2019. Iron sulfide formation in young and rapidly-deposited permeable sands at the land-sea transition zone. Science of the total environment 649, 264-283.

Seibert, S.L., Holt, T., Reckhardt, A., Ahrens, J., Beck, M., Pollmann, T., Giani, L., Waska, H., Böttcher, M.E., Greskowiak, J., Massmann, G., 2018. Hydrochemical evolution of a freshwater lens below a barrier island (Spiekeroog, Germany): The role of carbonate mineral reactions, cation exchange and redox processes. Applied Geochemistry 92, 196-208.

Holt, T., Seibert, S.L., Greskowiak, J., Freund, H., Massmann, G., 2017. Impact of storm tides and inundation frequency on water table salinity and vegetation on a juvenile barrier island. Journal of Hydrology 554, 666-679.

(Changed: 27 Jul 2023)  |