J. Denis Newbold, Ph.D.

200 200 Stroud Water Research Center

Research Scientist Emeritus

Ecosystem Processes Group

tel. 610-268-2153, ext. 227
970 Spencer Road, Avondale, PA 19311


  • Ph.D., Aquatic Ecology, University of California, Berkeley, California.
  • M.S., Hydrology, Cornell University, Ithaca, New York.
  • B.S., Engineering, Swarthmore College, Swarthmore, Pennsylvania.

Interests and Expertise

The flow of nutrients (primarily nitrogen, phosphorus, and carbon) to streams and rivers and how those nutrients are processed, transformed, and transported by the stream and river ecosystem.

Professional Experience

  • Research Scientist Emeritus, Stroud Water Research Center, 2011–present.
  • Research Scientist, Stroud Water Research Center, 1993–2011.
  • Assistant Curator, Stroud Water Research Center of the Academy of Natural Sciences of Philadelphia, 1985–1992.
  • Ruth Patrick Scholar, Stroud Water Research Center, Division of Environmental Research, Academy of Natural Sciences of Philadelphia. 1983–1985.
  • Research Staff Member, Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 1982–1983.
  • Research Associate, Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 1977–1982.
  • Eugene P. Wigner Postdoctoral Fellow, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 1977–1979.


Nutrient spiraling and transport in streams: the importance of in-stream biological processes to nutrient dynamics in streams

Webster, J.R., J.D. Newbold, and L. Lin. 2016. Pages 179–237 in J.B. Jones and E.H. Stanley, (editors). Streams in a changing environment. Academic Press, Cambridge, Massachusetts. 

The delivery of dissolved organic carbon from a forested hillslope to a headwater stream in southeastern Pennsylvania, USA

Mei, Y., G.M. Hornberger, L.A. Kaplan, J.D. Newbold, and A.K. Aufdenkampe. 2014. Water Resources Research 50(7):5774–5796.

Streamside forest buffer width needed to protect stream water quality, habitat, and organisms: a literature review

Sweeney, B.W., and J.D. Newbold. 2014. Journal of the American Water Resources Association 50:560–584.

A variable source area for groundwater evapotranspiration: impacts on modeling stream flow

Tsang, Y.P., G. Hornberger, L.A. KaplanJ.D. Newbold, and A.K. Aufdenkampe. 2014. Hydrological Processes 28(4):2439–2450.

Characteristic length scales and time‐averaged transport velocities of suspended sediment in the mid‐Atlantic Region, USA

J. Pizzuto, E.R. Schenk, C.R. Hupp, A. Gellis, G. Noe, E. Williamson, D.L. Karwan, M. O’Neal, J.  Marquard, R. Aalto, and J.D. Newbold. 2014. Water Resources Research 50:790–805.

See all publications by Stroud Center authors