Jay Frentress


  • PhD Water Resources Science – December 2015, Oregon State University
  • Mechanistic assessment of the groundwater and surface overland flow as streamflow sources in a forested headwater catchment (Luxembourg).
  • MS Water Resources Science & Botany and Plant Pathology – June 2010, Oregon State University
  • Characterization of carbon export from multiple nested watersheds within the Willamette River basin to address how hydrologic sources influence the flux of dissolved organic material across forested, agricultural, and urban land use types.
  • BS Biology/German – June 2002. Western Michigan University
  • Received Bachelor of Science in Biological Sciences and German with minors in Environmental Studies and Chemistry. Lee Honors College, cum laude.


Academic Positions:

Associate Researcher – Free University of Bolzano, Italy. August 2016 – present. Design and implement ecohydrological experiments to better understand water use and mixing between atmospheric and subsurface sources in a managed apple orchard in the Eastern Alps.

Research Scientist – Centre de Recherche Public Gabriel Lippmann (now named Luxembourg Institute of Science and Technology, Luxembourg). August 2010 – August 2014. Conducted innovative research in riparian hydrology to study the effect of rainfall on the surface saturation extent and mixing between groundwater and surface water within Luxembourg catchments.


Awards & Activities:

  • 2015 AGU Student Video Contest Winner (co-author)
  • 2015 Lee Harris Travel Grant – Forest Engineering & Research Management (OSU)
  • 2015 & 2012 Outstanding PhD Presentation Award – Oregon Water Symposium
  • 2010 – 2014 Research Fellow with Fonds National de Recherche – Aides à la Formation-Recherche (Luxembourg)
  • 2009 National Science Foundation East Asia Pacific Summer Institute Fellow (~$8,000)
  • Recipient of the 2008 Institute for Water and Watersheds research grant ($7,272)
  • Recipient of the 2008 OSU Alumni award for outstanding service to the hydrologic community
  • Recipient of the 2007 Anita S. Summers Graduate Student Travel Award
  • American Geophysical Union Student Member (2006 to present)
  • American Water Resources Association (AWRA) affiliate organization president (2007/2008) – OSU Hydrophiles



Glaser, B., Klaus, J., Frei, S., Frentress, J., Pfister, L. and Hopp, L. 2016. ‘On the value of surface saturated area dynamics mapped with thermal infrared imagery for modeling the hillslope-riparian-stream continuum: Validation of modelled surface saturation’. Water Resources Research. 52:10 8317-8342.

Martínez-Carreras, N., Wetzel, C., Frentress, J., Ector, L., McDonnell, J., Hoffmann, L., and Pfister, L. 2015. ‘Hydrological connectivity as indicated by transport of diatoms through the riparian–stream system’, Hydrologic and Earth Systems Science 19:7 3133-3151.

Coles, A., Wetzel, C., Martínez-Carreras, N., Ector, L., McDonnell, J., Frentress, J., Klaus, J., Hoffmann L., and Pfister, L. 2015. ‘Diatoms as a tracer of hydrological connectivity: are they supply limited?’, Ecohydrology http://dx.doi.org/10.1002/eco.1662.

Gu, W., Shang, M., Zhai, S., Lu, J., Frentress, J., McDonnell, J., and Kendall, C. 2010. ‘The rainfall-runoff paradox from natural experimental catchments’, Advances in Water Science (Chinese), 21(4): 478-488.

Kilian, J., Frentress J., Klauda R., Becker A., and Stranko, S. 2009. ‘The Invasion of Procambarus clarkii (Decapoda: Cambaridae) into Maryland Streams Following Its Introduction in Outdoor Aquaculture Ponds’, Northeastern Naturalist 16(4): 655-663.

Xenopoulos, M., Lodge, D., Frentress, J., Kreps, T., Bridgham, S., Grossman, E., and Jackson, C. 2003. ‘Regional comparisons of watershed determinants of dissolved organic carbon in temperate lakes from the Upper Great Lakes region and selected regions globally’, Limnology & Oceanography 48(6), 2321-2334.

Publications in Preparation:

Thoma, M., Frentress, J., Tagliavini, M., and Scandellari, F. 2017. ‘Suitability of Pore Water Samplers to Collect Soil Water for Stable Isotope Analysis’. Submitted.

Frentress, J., Pfister, L., and McDonnell, J. ‘Application of high-frequency infrared imagery to investigate plot-scale surface saturation dynamics and sources of surface overland flow in response to fluctuating groundwater tables and incident precipitation’, Submission 2017.

Frentress, J., Pfister L., and McDonnell, J. ‘The role of near-stream groundwater exfiltration on headwater stream chemostasis’, Submission 2017.

Frentress, J., Pfister, L., and McDonnell, J. ‘Unraveling hydrological controls on stream water chemistry in a headwater catchment (Weierbach, Luxembourg)’, Submission 2017.

Book Chapters, Theses, Reports:

[Book Chapter] Pfister, L., Wetzel, C., Martínez-Carreras, N., Frentress, J. and Ector, L. 2015. ‘Documenting Connectivity of Hydrologic Flowpaths Using Terrestrial Diatoms and Thermal Infrared Imagery, Chapter 3 of Advances in Watershed Hydrology, edited by Tommaso Moramarco, Silva Barbetta, and Luca Broca. ISBN: 978-1-887201-85-8. 2015

[Book Chapter] Gu, W., Liu, J., Lu, J. and Frentress, J. 2013. ‘Current Challenges in Experimental Watershed Hydrology’, Chapter 12 of Current Perspectives in Contaminant Hydrology and Water Resources Sustainability, Dr. Paul Bradley (Ed.), ISBN: 978-953-51-1046-0

[Thesis] Frentress, J. 2015. ‘The role of near-stream zones on flow, chemistry and isotopic composition at the headwater scale”, Oregon State University PhD Dissertation.

[Thesis] Frentress, J. 2011. ‘Stream DOC, nitrate, chloride and SUVA response to land use during winter baseflow conditions in sub-basins of the Willamette River Basin, OR’, Oregon State University MS Thesis.

[Report] Kilian, J., Stranko, S., and Frentress, J. 2006. ‘Aquatic Conservation Targets: prioritization of streams in need of restoration and protection and the assessment of stream conditions in 2005 Watershed Restoration Action Strategy (WRAS) watersheds: Deer Creek, Prettyboy Reservoir, Port Tobacco River, Miles River and Assawoman Bay’, Maryland Department of Natural Resources.