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Stefan Talke
Stefan Talke

Assistant Professor

Ph.D., Civil and Environmental Engineering, University of California, Berkeley, 2005
M.S., Civil and Environmental Engineering, University of California, Berkeley, 2001
B.S., Mechanical Engineering, University of California, Berkeley, 1996

Dr. Talke's research focuses on hydrodynamic processes and sediment transport in estuaries, rivers, and the ocean, using a combination of field research,data analysis, and modeling. He joined Portland State in September 2010 to analyze and model historical changes to tides in the Pacific Ocean, with a particular focus on west coast tidal stations such as Astoria. A recent project at the University of Washington combined state-of the art thermal remote sensing with in-situ flow measurements to characterize turbulent mixing and coherent structures such as vortices and internal waves in a stratified tidal river. Results show how large-scale vortices bring elevated turbulent kinetic energy to the water surface. The research has implications for mixing processes (e.g., of sediment) and for air/water gas transfer (e.g., oxygen). In Germany and the Netherlands, Dr. Talke measured and modeled sediment transport, focusing on how dredging-induced changes to depth altered tides, circulation, sediment trapping, and water quality in the Ems estuary. The increased oxygen depletion over the last 20 years was linked to anthropogenically-influenced increases in suspended sediment concentration. Dr. Talke's PhD thesis focused on tidal processes, turbulent mixing, and sediment transport in an intertidal area of S.F. Bay. Dr. Talke remains interested in small scale, turbulent mixing process, transport issues, and changes to coastal processes caused by climate and by local anthropogenic development.