Starting with a set of field experiments
piggybacked on a soil flow path tracer experiment at the Rocky Flats
site in 1993, we have been investigating the mobilization and
transport of particles in the unsaturated zone. Our interest in
particles in soils stems from the strong association between some
contaminants (e.g., plutonium) and particles and the potential for
particle-facilitated transport of these contaminants. We've
emphasized the role of rainfall intensity and soil structure
(preferential flow paths, macropores) on particle mobilization.
- Tracer Experiments in the Vadose Zone at
the Rocky Flats Plant Site
co-PIs: T.H. Illangasekare, M. Nachabe, J.N. Ryan, J. White, M.
EG&G Rocky Flats/U.S. Department of Energy, 1993
- Mobilization and Transport of Particles
Contaminants in the Unsaturated Zone
PI: Joe Ryan
National Science Foundation, EAR Hydrologic Sciences (EAR-9909553),
- Prof. Tissa H.
School of Mines, Golden, Colorado
- Prof. M. Iggy Litaor
- Robert Shannon, PACE Analytical
- Nicole DeNovio, PhD in progress, Particle
Mobilization by Rainfall in Macroporous Soils.
Nicole's research will focus on the effects of rainfall intensity
and duration and the structure of soils, both model and natural, in
controlling the mobilization of particles in the unsaturated
zone. Experimental systems are now being developed to test the
hypotheses laid out for the NSF EAR Hydrologic Sciences project
links to PDF files; some PDF files are large -- 2-4 MBytes)
- Simulating the Effects of Rainfall on Particle and Plutonium
Transport in Rocky Flats Soils. Colorado School of Mines,
Environmental Engineering Sciences Division, Golden, Colorado,
- Mobilizing Particles (and Plutonium) in Macroporous Soils during
Rainfall Simulations at Rocky Flats, Colorado. Ohio State
University, Joint Geological Sciences-Civil and Environmental
Engineering Seminar Series, Columbus, Ohio, 1998.
- Role of Particles in Actinide Transport Through Soils during
Simulated Rainfall. American Society of Agronomy Annual
Meeting, Indianapolis, Indiana, 1996.
/ Collaborators / Students
and Theses / Publications / Presentations
CU students using rainfall
simulator to conduct experiments near the "903 Pad" at the
Rocky Flats site, July 1993.
Sketch of instrumented soil pits
installed by Iggy Litaor and colleagues for the study of plutonium
transport near the "903 Pad" at the Rocky Flats site.