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Scott Alan Bradford

Research Leader
 Scott A Bradford   Dr. Scott Alan Bradford
Soil Scientist

Sustainable Agricultural Water Systems Unit
239 Hopkins Road
Davis, CA 95616

Phone: 1 (530) 400-9357



Research Interests:

  • Mechanisms and models for colloid and colloid-facilitated transport and fate
  • Multiphase flow, transport, and interphase mass transfer processes in porous media
  • Numerical and analytic models
  • Development and design of animal waste management practices and treatments
  • Comprehensive nutrient management plans

Academic Degrees:

Ph.D. Soil Science (Soil Physics), University of California, Riverside, 1995
  Dissertation: Experimental and Theoretical Investigations of Multiphase Capillarity
M.S. Soil Science (Soil Physics), University of California, Riverside, 1991
  Thesis: Transient State Modeling of Various Irrigation Management Strategies
B.S. Physics, Brigham Young University, 1989
  Minors in Chemistry and Mathematics


  • Passed the 8 hour NCEES Professional Civil Engineering Exam


Present and Past Positions:

2000-Present Soil Scientist (GS-15) USDA-ARS U.S. Salinity Laboratory
Riverside, CA
1999 Adjunct Assistant Professor Dept. of Civil and Environmental Engineering,
University of Michigan, Ann Arbor, MI
1995-2000 Postdoctoral Positions (Assistant Research Scientist, Research Investigator, and Research Fellow) Dept. of Civil and Environmental Engineering,
University of Michigan, Ann Arbor, MI


Professional Research and Publications:

Dr. Bradford is a world renowned expert in the field of mechanisms and models to describe colloid (nanoparticles, microorganisms, and clays) and colloid-facilitated transport and fate in the environment.  He has authored over 124 publications on a wide variety of topics in soil physics, contaminant hydrology, and environmental engineering.  Most of these publications appeared in peer-reviewed journals.  He has a Google Scholar H-factor of 45 (45 publications with more than 45 citations), and is first-author on 3 invited review papers.



  • Excellence in Review Award, Environmental Science & Technology, 2012.
  • Fellow of the Soil Science Society of America.
  • Fellow of the American Society of Agronomy.

Research Grants:

  • Co-Principal investigator on proposals totaling more than $2.6 million.

Special Invitations:

  • Over 37 invited presentations to national and international audience, including 5 keynote addresses.

Professional Affiliations:

  • American Geophysical Union
  • American Society of Agronomy
  • Soil Science Society of America

Professional Service:

  • Editor in Chief for Critical Reviews of Environmental Science and Technology (2017-present), Technical Editor for Journal of Environmental Quality (JEQ, 2014-2016), Associate Editor (AE) for JEQ (2003-2006), and AE for Vadose Zone Journal (VZJ, 2004-2013).
  • Co-organizer of special issues in JEQ (2008 and 2015) and VZJ (2008), and sessions at annual meetings of SSSA (1997 and 2006) and AGU (2008, 2010, and 2011).
  • Co-organizer of conference entitled “Aerobic Spores and Other Microbial Indicators for Determining Groundwater Under the Direct Influence of Surface Water”.  This conference was held in Riverside, CA on Sept. 6-8, 2016.
  • International Conference “Interfaces Against Pollution”, Advisory Committee, May 2004 - 2012.
  • Secretary (2005) and chair (2006) of the W1188 Multistate Research Project entitled “Characterizing Mass and Energy Transport at Different Scales”, USDA, CSREES.
  • USDA-ARS, National Program 206 (Manure and Byproduct Utilization) Planning Committee. April 13-15, 2004.
  • Co-team leader (with Yakov Pachepsky), NP 206, Manure and Byproduct Utilization, Pathogens problem area 2e, Modeling fate and transport of manure-borne pathogens from “pedon” to watershed scale. April, 2004-2009.
  • ASA and SSSA Fellows Committee 2014 and 2015.
  • University faculty promotion and tenure evaluation committees (3).
  • Dissertation evaluation and defense committees of 6 PhD students, and also informally supervised and mentored research activities of 7 other PhD students.
  • Reviewer for numerous technical journals (>21), funding organizations (7), proposal evaluation committees (2), and project advisor committees (3).