Stefan A Talke



Dr. Stefan A. Talke

Post Doc

Civil & Environmental Engineering Department

University of Washington

Email: stalke *at* u.washington.edu

EDUCATION:

2005 Ph.D. Civil and Environmental Engineering, University of California at Berkeley

May 2005 in Environmental Fluid Mechanics (Minors: Biology & Math)

2001 M.S. Civil and Environmental Engineering, University of California at Berkeley

Environmental Engineering

1996 B..S. University of California at Berkeley

Mechanical Engineering

RESEARCH EXPERIENCE:

8/07-present Post Doc, Civil and Environmental Engineering department, University of Washington

Project: Coherent structures in Estuaries Experiment (COHSTREX)

• Project combines in-situ, laboratory, and remote sensing data to understand coherent structures (‘boils’) in an estuarine river and their generation, propagation, and surface signature. Research focuses on the dynamics of mixing layers and the generation of coherent structures in flow over sills during stratified and unstratified conditions

1/05-8-07 Post Doc, Institute for Marine and Atmospheric Studies, University of Utrecht, Netherlands

Project: Dynamics of Estuarine Turbidity Maxima (ETM): coupling of morphology and biology (phys.uu.nl/~talke/Ems/Ems_research.htm).

• Extensive measurements showed large (35 km long) zone of trapped sediment in the Ems estuary produced hypoxic conditions

• Developed an analytical model for circulation, sediment distribution, and oxygen depletion in the turbidity zone of the Ems estuary. Model highlights the role of turbidity gradients in driving circulation, and researches the effect of both man-made and natural changes (e.g., depth or freshwater discharge) on the equilibrium distribution and magnitude of suspended sediment, organic material , and dissolved oxygen concentrations.

• Concluded that the deepening of shipping channels has moved sediment upstream and increased its concentration 10-fold, resulting in oxygen depletion from high concentrations of refractory organic material.

• Responsibilities included designing, managing, and leading multiple field campaigns involving several universities and seven government agencies and private companies. Measurements focused on suspended sediment, hydrodynamics, and biology. In addition, co-advised a Masters and 2 PhD students.

8/00-12/04 Research Assistant, Civil and Environmental Engineering Department, UC-Berkeley

Advisor: Prof. Mark. T. Stacey

• Research used a combination of field research, data analysis and turbulence modeling to investigate the erosion, mixing and transport of sediment on a contaminated intertidal mudflat in San Francisco Bay. Results suggest that sediment transport depends on a complex interaction between wind waves, ocean swell, seiching, tides over short (seconds) to long (sub-tidal) time scales.

PROFESSIONAL EXPERIENCE:

6/00-8/00 Intern, Montgomery Watson, Walnut Creek CA.

Worked on groundwater remediation projects involving hydrocarbons and heavy metals.

2/97-5/99 Software Quality Assurance Engineer, Parametric Technology Corporation, San Jose CA. Duties included testing engineering software in the fields of dynamics, kinematics, mechanism design and animation, CAD, and finite element modeling, in both English and German versions.

6/96-8/96 Intern, Phase Metrics, San Diego CA.

Designed an experiment to explore using feedback from a laser to measure displacement.

9/94-12/94 Intern, Bodensee Geraete Technik, Ueberlingen, Germany.

Modeled the kinematics of a mirror attached to a 4-bar linkage and cam system.

TEACHING EXPERIENCE:

8/02-12/02 Graduate Student Instructor, Civil and Environmental Engineering Department, UC-Berkeley. Led discussion and laboratory sections for an introductory undergraduate course in fluid mechanics.

3/98-6/99 Guest Lecturer, Applied Mechanics and Engineering Science, UC San Diego

Presented Computer Aided Design (CAD) software once a quarter to upper division students in Mechanical engineering.

RESEARCH INTERESTS:

• Observation and modeling of sediment transport processes in rivers, estuaries, and the coastal ocean

• Historical and contemporary changes to the functioning of rivers, estuaries and the coastal zone, both physically and biologically

• Application of environmental fluid mechanics to morphodynamic processes

• The temporal and spatial evolution of turbid zones (e.g., Estuarine Turbidity Maximum), and its affect on the formation of algal blooms and anoxic zones.

• Density driven flows and mixing caused by gradients in salinity and/or sediment concentration

• Characterization of turbulence and coherent structures in environments with complex forcing

• The short term (tidal) and long term (multiple year) effect of wind and waves on morphology and the sequestration and release of contaminants

TEACHING INTERESTS:

• Environmental Engineering and Science

• Physical processes in the coastal ocean, estuaries, and rivers

• Field studies of natural systems; Data collection, analysis and interpretation

• History of Science

• Sediment and scalar transport

• Mixing, and turbulence in coastal flows

• Biological and environmental applications of fluid mechanics

PUBLICATIONS

Chickadel, C.C., A.R. Horner-Devine, A.T. Jessup, & S.A Talke , 2009. Vertical boil propagation from a submerged estuarine sill. Submitted to Journal of Geophysical Research, Letters.

Talke, S.A., H.E. de Swart, & V.N. de Jonge, 2009. An idealized model and systematic process study of oxygen depletion in highly turbid estuaries. Accepted for publication in Estuaries and Coasts.

Talke, S.A. & M.T. Stacey, 2008. Suspended Sediment Fluxes at an intertidal flat: Shifting Influence of wave, wind, tidal, and freshwater forcing. Continental Shelf Research doi:10.1016/j.csr.2007.12.003

Talke, S.A., H.E. De Swart & H.M.Schuttelaars, 2007. Feedback between residual circulation and sediment distribution in highly turbid estuaries: an analytical model. Continental Shelf Research, doi:10.1016/j.csr.2007.09.002 AVAILABLE ONLINE

de Swart, H.E., H.M.Schuttelaars, & S.A.Talke, 2007. Phytoplankton growth in turbid estuaries: a simple model. Continental Shelf Research, doi:10.1016/j.csr.2007.09.006 AVAILABLE ONLINE

Talke, S.A., H.E. de Swart, and H.M. Schuttelaars, 2007. An analytical model of the equilibrium distribution of suspended sediment in an estuary. In Dohmen-Janssen and Hulscher, editors, River, Coastal and Estuarine Morphodynamics 2008, pages 403-411, London, 2007. RCEM 2007, Taylor & Francis

Talke, S.A. & H.E. de Swart, 2006. Hydrodynamics and Morphology in the Ems/Dollard Estuary: Review of Models, Measurements, Scientific Literature, and the Effects of Changing Conditions. Report for Rijkswaterstaat (Ministry of Public Works, Netherlands), 78 pp.

Talke, S.A., 2005. An Investigation on the Hydrodynamics and Sediment Dynamics on an Intertidal Mudflat on Central San Francisco Bay. PhD Thesis, University of California, Berkeley.

Talke, S.A. & M.T. Stacey, 2003. The influence of oceanic swell on flows over an estuarine intertidal mudflat in San Francisco Bay, Estuarine, Coastal, and Shelf Science 58, 541-554.

MANUSCRIPTS IN PREPARATION

Talke, S.A., Horner-Devine, A.R., in preparation. Shear layer dynamics over an abrupt bathymetric change.

Talke, S.A., V.N. de Jonge, H.E.de Swart, in preparation. Key factors governing the physics and biology of the Ems-Dollard estuary at different scales: A review. To be submitted to Estuarine, Coastal, and Shelf Science, 2008.

Talke, S.A. & M.T. Stacey, in preparation. Yearly variation of wind events and its implications for the long-term sediment transport on an Intertidal Mudflat. To be submitted to Journal of Marine Geology

CONFERENCE PRESENTATIONS

Talke, S.A., A.R. Horner-Devine, C. Chickadel, 2008. Characterizing coherent structures in an estuary using in-situ and remote measurements. To be presented at Ocean Sciences meeting, Florida, in March.

Talke, S.A., A.R. Horner-Devine, C. Chickadel, M. Scully, R. Geyer, 2007. Characterizing turbulence in the presence of coherent structures in an estuary, Poster presented at Fall AGU meeting in San Francisco, Dec. 2007.

Talke, S.A., H.E. de Swart, & V.N. de Jonge, 2007. Modeling the distribution of oxygen deficits in highly turbid estuaries. Presented at the ERF conference in Providence, RI, Nov. 2007.

Chernetskyy, O.; S. A. Talke, H.M. Schuttelaars, H. E. de Swart, 2007. Effect of Deepening the Ems Estuary on Tidal Dynamics and Residual Circulation Patterns. Presented at the ERF conference in Providence, RI, Nov. 2007

Talke, S.A., H.E. de Swart & H.M.Schuttelaars, 2007. An analytical model of the equilibrium distribution of suspended sediment in estuaries. Presented at RCEM conference in Sept. 2007 in Enschede, Netherlands, by H.E. de Swart.

Talke, S.A., H.E. de Swart & H.M.Schuttelaars, 2006. Feedback between residual circulations and sediment distribution in highly turbid estuaries: an analytical model. Presented at the PECS conference, Astoria, Oregon, in September 2006.

Talke, S.A & H.E. de Swart., 2006. Turbidity driven flows at the Estuary Turbidity Maximum

(E TM) in the Ems Estuary. Poster presented at Coastal Seas conference, Bangor, April 2006.

Talke, S.A , V.N. de Jonge, & H.E. de Swart, 2005. Measuring and Modelling Biological and Physical Parameters at the Estuary Turbidity Maximum on a River with High Sediment Concentration (Ems Estuary), presented at ECSA regional conference, Groningen, Netherlands, Nov. 2005.

Talke, S.A, V.N. de Jonge, & H.E. de Swart, 2005. Measuring and Modelling Biological and Physical Parameters at the Estuary Turbidity Maximum on a River with High Sediment Concentration (Ems Estuary), Poster presented at ERF conference in Norfolk, VA, Oct. 2005.

Talke, S.A. & M.T. Stacey, 2004. Sediment Transport on an Intertidal Mudflat: Presence and Importance of Multiple Frequencies of Motion, Poster presented at AGU Chapman Conference, Halifax, Nova Scotia, Canada, Oct. 2004.

Talke, S.A. & M.T. Stacey, 2004. Boundary layer dynamics on an intertidal mudflat in central San Francisco Bay, Poster presented at Ocean Sciences Conference, Portland Oregon Jan. 2004.

Talke, S.A. & M.T. Stacey, 2002. Spectral Analysis of near bed velocity measurements at an intertidal estuarine mudflat. Presented at Ocean Sciences Conference, Honolulu, Hawaii Feb. 2002.

INVITED TALKS

Talke, S.A., 2007. Sediment transport and oxygen depletion in an extremely muddy estuary. Presented at the Civil and Environmental Engineering seminar series at the University of Washington, Oct. 2007.

Talke, S.A., 2007. Measurements and Models of the Turbidity Maximum of the Ems Estuary. Civil Engineering department, University of Delft, April 2007.

Talke, S.A & H.E. de Swart, 2006. Measuring and modelling the effect of high turbidity and fluid mud on vertical mixing and residual currents in the Ems Estuary. Presented at the Workshop on Mathematics and Earth Sciences, Groningen, Netherlands, Nov 29, 2006.

Talke, S.A. & H.E. de Swart, 2006. Turbidity currents and the changing distribution of sediment at the estuarine turbidity maximum (ETM) of the Ems Estuary, Presented at the Baltic Sea Research Institute in Warnemuende, Germany, Nov. 10, 2006.

Talke, S.A & H.E. de Swart, 2006. Schwebstoffdynamik TideEms: Prozesse das die Lage und Verteilung von hohe Schwebstoffkonzentrationen der TideEms beeinflussen:  Truebung, Salzgehalt, und vertiefung des Fluesses (Processes affecting the location and distribution of high sediment concentrations in the Ems estuary: turbidity, salinity, and deepening of the river). Presented at joint BAW/BfG Colloquium in Hamburg, Germany, Nov 8. 2006.

Talke, S.A & H.E. de Swart., 2006. Measuring and Modelling the effect of high turbidity and fluid mud on vertical mixing and residual currents in the Ems Estuary Presented at Workshop “Physical processes in estuaries: observations and model approaches” in Antwerp, Belgium, April 2006.

Talke, S.A, V.N. de Jonge, & H.E. de Swart, 2006. The dynamics of estuarine turbidity maxima. Workshop on Ems Estuary, Groningen, Netherlands, March 2006.

Talke, S.A., 2005. Physical Processes on Intertidal Mudflats:  Waves, Currents, and Sediment Transport. Presented in IMAU lecture series, Utrecht, Netherlands, June 2005.

AWARDS

UC Berkeley Scholarship, 1999-2000 Academic Year

Outstanding Contribution Award, Parametric Technology, July 1997.

PAPERS REVIEWED

Reviewer of manuscripts for: Estuaries and Coasts, Limnology and Oceanography Methods, and Estuarine, Coastal, and Shelf Science.

FOREIGN LANGUAGES

German (Fluent), French (3 years), Dutch (reading comprehension)

REFERENCES

Professor Mark T. Stacey

Department of Civil and Environmental Engineering

University of California at Berkeley, Berkeley, Berkeley, CA 94720

(510) 642-6776

mstacey *at* berkeley.edu

Professor H.E. de Swart

Institute for Marine and Atmospheric Studies

University of Utrecht,

P.O. box 80005

3508 TA Utrecht,

The Netherlands

++31 (0)30-253-3275

h.e.deswart *at* phys.uu.nl

Professor Henk M. Schuttelaars

Delft Institute of Applied Mathematics/Mathematical Physics

Delft University ofTechnology

Mekelweg 4, P.O.Box 5031

2600 GA Delft, The Netherlands

++31 (0) 15-278-3825

email: H.M.Schuttelaars *at* ewi.tudelft.nl

Alex Horner Devine

Assistant Professor, Environmental Fluid Mechanics

306 More Hall, Box 352700

Department of Civil and Environmental Engineering

University of Washington

Seattle, WA 98195-2700

Phone: (206) 685-3032

Fax: (206) 685-9185

Email: arhd *at* u.washington.edu

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