Wilfred Wollheim
Research Assistant Professor, Complex Systems Research Center
Dr. Wollheim joined the Water Systems Analysis Group in 1999 and currently serves as a Co-Director.
Research Interests
The focus of Wil's research is on how river networks control the flux of nutrients and carbon in response to changes in land use, climate change, and hydrological engineering. To address this question, Wil uses field observations, field experiments, and modeling over a range of scales from headwater catchments, to moderately sized (~100-1000 km2) watersheds, to the global system of rivers, lakes, and reservoirs. Wil believes that a better understanding of river network dynamics will help to address issues of coastal eutrophication, freshwater quality and the fate of anthropogenic carbon.
Curriculum Vitae
A pdf version of Wil's curriculum vitae is available here.
Selected Publications
Wollheim, W.M., B.J. Peterson, C.J. Vorosmarty, C. Hopkinson, and S.A. Thomas (2008). Dynamics of N removal over annual time scales in a suburban river network. Journal of Geophysical Research - Biogeosciences. G03038, doi:10.1029/2007JG000660.
Wollheim, W.M., C.J. Vorosmarty, A.F. Bouwman, P.A. Green, J. Harrison, E. Linder, B.J. Peterson, S. Seitzinger, and J.P.M. Syvitski (2008). Global N removal by freshwater aquatic systems: A spatially distributed, within-basin approach. Global Biogeochemical Cycles. GB2026, doi:10.1029/2007GB002963.
Wollheim, W.M., C.J. Vorosmarty, B.J. Peterson, S.P. Seitzinger, and C.S. Hopkinson (2006). Relationship between river size and nutrient removal. Geophysical Research Letters 33, L06410.
Wollheim, W.M., B.A. Pellerin, C.J. Vorosmarty, and C.S. Hopkinson (2005). N retention in urbanizing headwater catchments. Ecosystems 8:871-884.
Wollheim, W.M., B.J. Peterson, L.A. Deegan, J.E. Hobbie, B. Hooker, W.B. Bowden, K.J. Edwardson, D.B. Arscott, and A.E. Hershey (2001). Influence of stream size on ammonium and suspended particulate nitrogen processing. Limnology and Oceanography 46:1-13.
Alexander, R.B., J.F. Bohlke, E.W. Boyer, M. David, J.W. Harvey, P.J. Mulholland, S.P. Seitzinger, C.R. Tobias, C. Tonitto, and W.M. Wollheim. Annually and Seasonally Varying Effects of Denitrification on Riverine Nitrogen Transport. Biogeochemistry, in Press.
Harrison, J., R. Maranger, R.B. Alexander, J. Cornwell, A. Giblin, P. Jacinthe, E. Mayorga, S. Seitzinger, W.M. Wollheim. The Regional and Global Significance of Reactive N Removal in Lakes and Reservoirs. Biogeochemistry, in Press.
Pellerin, B.A., W.M. Wollheim, X. Feng, and C.J. Vorosmarty (2007). The Application of Electrical Conductivity as a Tracer for Hydrograph Separation in Urban Catchments. Hydrological Processess, Online 10.1002/hyp.6786.
Research Projects
2004-2010 - NSF-LTER. Plum Island Sound Comparative Ecosystem Study. Lead PI at UNH, with A. Giblin, C. Hopkinson, B. Peterson, L. Deegan, J. Vallino, and J. Morris.
2007-2011 - NSF-DEB-Coupled Human Natural Systems. Suburbanization, Water-Use, Nitrogen Cycling & Eutrophication in the 21st Century: Interactions, Feedbacks and Uncertainties in a Massachusetts Coastal Zone, with C. Polsky, C. Hopkinson, G. Pontius, and C. Vorosmarty.
2006-2009 - NSF-DEB-Ecosystems. Collaborative Research: Understanding the Scaling of N Cycle Controls Throughout a River Network, with C. Vorosmarty, B. Peterson, C. Hopkinson, and M. Gooseff.
2008-2010 - EPA-Star. Nonlinear Responses to Multiple Environmental Stresses: Exploring Thresholds in Land-River Networks and their Impact on Strategic Ecosystems Services Over the National Domain, with J. Melillo, C. Vorosmarty, B. Peterson, J. McClelland, B. Felzer, and D. Kicklighter.
2007-2010 - NASA-IDS. Further Tests on a Modeling Framework to Detect and Analyze Changes in Land-To-Coastal Fluxes, with C. Vorosmarty, J. Syvitski, C. Milly, S. Seitzinger, S. Greb, J. Salisbury, M. Meybeck, and B. Peterson.