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Paul Reimus

Research Interests

Paul Reimus has worked at Los Alamos National Laboratory as a staff member since July 1989.  His primary research interests have been conducting and interpreting field-scale tracer transport experiments in saturated, fractured media and in saturated alluvium systems for the Yucca Mountain Project.  The tracers used in the experiments have included sorbing and nonsorbing solutes and synthetic colloids (polystyrene microspheres).  Goals have included (1) obtaining field-scale data that can be used to develop and validate models of radionuclide transport over large scales and (2) testing the validity of using laboratory-derived sorption data to predict field-scale reactive transport behavior.

In addition to his Yucca Mountain work, he has collaborated on field tracer experiments with...

  1. Lawrence Berkeley National Laboratory, using microspheres as tracers in fractured granite,
  2. UGTA project participants, using microspheres as tracers in fractured media at the Nevada Test Site, and
  3. the Desert Research Institute, using solute tracers in fractured granite.

In addition to these field-scale efforts he has also been involved with conducting and interpreting numerous laboratory-scale tracer and contaminant transport experiments in which solute and colloid transport were studied in natural fractures, artificial fractures, packed columns (porous media), or intact pieces of rock (diffusion studies).  Batch sorption and desorption experiments have often been conducted in parallel with column experiments to assess the ability to predict reactive transport under flowing conditions from batch measurements.

Most recently, Paul has taken a position with the Yucca Mountain Program as lead technical science advisor to the testing program.  In this role, he will help guide research directions and coordinate testing with the PIs, the test coordination office and the Lead Lab.  Amidst this important work task, he also manages to maintain involvement with research projects in contaminant flow and transport.


  • B.S. Chemical Engineering, Michigan Technological University, 1981
  • M.S. Chemical Engineering, New Mexico State University, 1984
  • Ph.D. Engineering, University of New Mexico, 1995

Plot showing tracer recovery from cross-hole test conducted at C-wells complex near Yucca Mountain, Nevada.

Recent Publications

Reimus, P. W., G. Pohll, T. Mihevc, J. Chapman, L. Papelis, B. Lyles, S. Kosinski, R. Niswonger, and P. Sanders.  2003.  “Testing and Parameterizing a Conceptual Model for Radionuclide Transport in a Fractured Granite using Multiple Tracers in a Forced-Gradient Test”, Water Resources Research, 39(12), 1350, doi:10.1029/2002WR001597.

Reimus, P. W., M. J. Haga, A. I. Adams, T. J. Callahan, H. J. Turin, and D. A. Counce.  2003.  “Testing and Parameterizing a Conceptual Solute Transport Model in Saturated Fractured Tuff using Sorbing and Nonsorbing Tracers in Cross-Hole Tracer Tests,” J. Contaminant Hydrology, 62-63, 613-636.

Sullivan, E. J., P. W. Reimus, and D. A. Counce.  2003.  “Effects Of Mineralogy, Exchange Capacity, Surface Area and Grain Size on Lithium Sorption to Zeolitic Alluvium near Yucca Mountain, Nevada”, Clays and Clay Minerals, 51(6), 634-643.

Sullivan, E. J., P. W. Reimus, and D. A. Counce.  2003.  “Transport of a Reactive Tracer in Saturated Alluvium Described using a Three-Component Cation-Exchange Model,” J. Contaminant Hydrology, 62-63, 675-694.

Lu, N., P. W. Reimus, G. R. Parker, J. L. Conca, and I. R. Triay.  2003.  “Sorption Kinetics and Impact of Temperature, Ionic Strength and Colloid Concentration on the Adsorption of Plutonium-239 by Inorganic Colloids,” Radiochimica Acta, 91, 1-8.

Reimus, P. W. and S. C, James.  2002.  “Determining the Random Time Step in a Constant Spatial Step Particle Tracking Algorithm,” Chemical Eng. Science, 57(21), 4429-4434

Abdel-Fattah, A. I., M. S. El-Genk, and P. W. Reimus.  2002.  “Automated Video Microscopic Imaging and Data Acquisition System for Colloid Deposition Measurements,” J. Colloid Interface Science, 246(2), 241-258.

Anghel, I., H. J. Turin, and P. W. Reimus.  2002.  “Lithium Sorption to Yucca Mountain Tuffs,” Applied Geochemistry, 17(6), 819-824.

Callahan, T. J., P. W. Reimus, R. S. Bowman, and M. J. Haga.  2000.  “Using Multiple Experimental Methods to Determine Fracture/Matrix Interactions and Dispersion of Nonreactive Solutes in Saturated Volcanic Rock,” Water Resources Research, 36(12), 3547-3558.

Becker, M. W., P. W. Reimus, and P. Vilks.  1999.  “Transport and Attenuation of Carboxylate-Modified Latex Microspheres in Fractured Rock Laboratory and Field Tests,” Ground Water, 37(3).


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