William R Green


Reed Green is a Hydrologist / Adjunct Professor with the USGS. He holds a B.S. and M.S. in Botany (1982 and 1985, respectively) and a Ph.D. in Biology (1998, Limnology) from the University of Arkansas, specializing in watershed hydrology and reservoir limnology, hydrodynamics and water-quality interactions, nutrient and phytoplankton dynamics.  Reed holds Adjunct faculty appointments at both University of Arkansas in Little Rock (Biological Sciences and Earth Sciences Departments) and University of Arkansas in Fayetteville (Department of Geosciences).  Reed's current research includes studies involving real-time water-quality monitoring and 2- and 3-dimensional models of hydrodynamics and water quality in lakes and reservoirs.


Research Interests:

Current research and investigation interests include real-time lake and reservoir water-quality monitoring that drive real-time 2-dimensional and 3-dimensional hydrodynamic and water-quality reservoir models. 


Recent advances in sensor technology and data telemetry allow a range of surface meteorological and vertical water-column data to be collected simultaneously, in real time, for lakes and reservoirs.  With recent advancements in computer technology, 2D and 3D lake and reservoir models can be run in much shorter time frames, allowing for real-time simulations of hydrodynamics and water quality.  Together, these advances allow for the development of quasi-real-time decision-support systems for water-quality management of individual lakes and reservoir systems.  Real-time model simulations will provide necessary information for "data-driven" monitoring schemes designed to examine current physical, chemical, and biological conditions that impair the water quality of a lake or reservoir, like algal blooms.  For example, real-time model simulations and resultant animations of algal patch development (functional groups like nitrogen-fixing cyanobacteria or even species like Microcystis aeruginosa), which may be responsible for taste and odor or toxin problems in drinking water, will provide up-to-date information that can be used by monitoring teams to cost-effectively target data-collection to specific locations in the lake or reservoir and collect data throughout the growth phase and subsequent crash of the algal population.  Until recently, recognition of an algal bloom in a lake or reservoir did not happen until after the bloom peaked or crashed, and then too late to collect information about the conditions that propagated the bloom.  Understanding the processes that lead to an algal bloom and water-quality impairment will aid in the design of in-lake or landscape engineering or management solutions to reduce or eliminate future impairments. 



1982, B.S. Botany, University of Arkansas
1985, M.S. Botany, University of Arkansas
1998, Ph.D. Biology (Limnology), University of Arkansas


Professional Experience:

U.S. Geological Survey, Arkansas Water Science Center, 1989 through present


  • Principal Investigator for Lake and Reservoir Science, 2011 - present.
  • Assistant Director, USGS Arkansas Water Science Center, November 2003 - 2011
  • Chief, Hydrologic Reservoir Science and Northwest Arkansas Programs, May, 2009 - 2011.
  • Chief, Hydrologic Surveillance and Analysis Section, November, 2003 - May, 2009.
  • Arkansas Water Science Center, Water-Quality Discipline Specialist, 1996 - 2005.
  • Principal Investigator and/or team leader/mentor for the following studies:
    • Assessment of Fish Habitat Impairment in U.S. Reservoirs – Classification of Reservoirs Based on Physical, Chemical, Morphological, Physiographic, Hydrologic, and Landscape Characteristics (ongoing)
    • White River Reservoir responses to climate change (ongoing)
    • Transport mechanisms for taste and odor compounds in Beaver Lake (ongoing)
    • Real-Time Decision Support System for Sustainable and Adaptive
      Management of Beaver Lake (ongoing)
    • Water-quality monitoring and assessment of Beaver Lake (ongoing)
    • Water-quality monitoring and assessment of Lakes Maumelle and Winona (ongoing)
    • Assessment of ambient conditions and simulation of hydrodynamics and water quality in Beaver, Table Rock, Bull Shoals, and Norfolk Lakes in northern Arkansas and southern Missouri - Beaver Lake modeling (ongoing)
    • Water-quality monitoring and assessment of the White, Illinois, and Kings Rivers in northwest Arkansas - White and Illinois (ongoing)
    • Eutrophication trends in the White River reservoirs (ongoing)
    • Water-quality monitoring and assessment of the Middle Fork Saline River in west-central Arkansas
    • Water-quality monitoring and assessment of Bear and Calf Creeks and Buffalo River
    • Numerical model development of hydrodynamics and water quality in Lake Maumelle
    • Source characterization of disinfection byproduct precursors in two drinking water supplies (Lakes Maumelle and Winona)


Academic Fellowship, University of Western Australia, Centre for Water Research, January through April 2007

Adjunct Faculty appointment, University of Arkansas at Fayetteville, Biological and Agricultural Engineering Department, 2006 through present

Adjunct Faculty appointment, University of Arkansas at Little Rock, Biological and Earth Sciences Departments, 2006 through present

U.S. Army Corps of Engineers, Waterways Experiment Station (now Engineer Research and Development Center), 1986 - 1989


Professional Affiliations: 

North American Lake Management Society - President Elect (2014)

American Water Resources Association

American Society of Limnology and Oceanography

Reservoir Fisheries Habitat Partnership

Sigma Xi



United States Department of the Interior, Superior Service Award, September, 2007